Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Minimum annual costs included in PGL's QIP rider during open reconciliation years Minimum annual costs included in PGL's QIP rider Minimum annual costs included in PGL's QIP rider between 2016 and 2022. Recovery of amounts previously written off Accounts Receivable, Allowance for Credit Loss, Recovery Maximum annual costs included in UEA rider during open reconciliation years Maximum annual costs included in UEA rider Maximum combined annual costs of PGL and NSG included in the UEA rider between 2019 and 2023. Short-term credit capacity Line of Credit Facility, Maximum Borrowing Capacity Change in – Increase (Decrease) in Operating Capital [Abstract] REGULATORY ENVIRONMENT Public Utilities Disclosure [Text Block] Award Type [Domain] Award Type [Domain] Fair Value as of Grant Date Award Grant Date Fair Value Investment, Name [Domain] Investment, Name [Domain] Renewal term Lessee, Finance Lease, Renewal Term Deferred income taxes Deferred Income Tax Liabilities, Net Insider Trading Policies and Procedures [Line Items] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Disaggregation of Operating Revenues Disaggregation of Revenue [Line Items] Percentage of additional earnings between 15 and 75 basis points refunded to customers Percentage of additional earnings between 15 and 75 basis points refunded to customers Percentage of utility earnings in excess of 15 basis points above the utility’s authorized return on equity (ROE), but not exceeding 75 basis points above the authorized ROE, that will be refunded to customers. Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Revolving credit facilities Line of Credit Facility [Line Items] Other, net Other Regulatory Assets (Liabilities) [Member] Schedule of net derivative instruments Net Derivative Instruments By Counterparty [Table Text Block] Tabular disclosure of derivative assets and liabilities if derivative instruments by counterparty were presented net on the balance sheets. Regulatory Assets and Liabilities Disclosure [Abstract] Regulatory Assets and Liabilities Disclosure [Abstract] Variable interest entities Variable Interest Entity [Line Items] Other Leases [Member] Represents revenues from leases. Customer [Axis] Customer [Axis] Current liabilities Liabilities, Current [Abstract] Accumulated impairment losses Goodwill, Impaired, Accumulated Impairment Loss Preferred stock of subsidiary Preferred Stock, Value, Issued Reconciling eliminations Intersegment Eliminations [Member] Federal excess deferred tax amortization, amount Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount Subsequent Event Type [Domain] Subsequent Event Type [Domain] Dividends paid on common stock Payments of Ordinary Dividends, Common Stock Impairment of property, plant, and equipment Impairment, Long-Lived Asset, Held-for-Use Schedule of Investments [Table] Schedule of Investments [Table] GUARANTEES Guarantees [Text Block] Accounts receivable and unbilled revenues, net of reserves of $166.9 and $193.5, respectively Accounts Receivable, after Allowance for Credit Loss, Current Reclassification of realized derivative gains to net income, net of tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Extinguishment of debt Extinguishment of Debt, Amount Regulatory liabilities Regulatory Liability [Line Items] Schedule of net benefit cost (credit) Schedule of Net Benefit Costs [Table Text Block] Long-term assets Assets, Noncurrent [Abstract] Blooming Grove , Tatanka Ridge, Jayhawk, Thunderhead, Samson I, and Sapphire Sky Blooming Grove Wind Energy Center LLC, Tatanka Ridge Wind, LLC, Jayhawk Renewables, LLC, Thunderhead Wind LLC, Samson I Solar Energy Center LLC, Sapphire Sky Wind Energy LLCSky [Member] This element represents details pertaining to Blooming Grove Wind Energy Center LLC, Tatanka Ridge Wind, LLC, Jayhawk Renewables, LLC, Thunderhead Wind LLC, Samson I Solar Energy Center LLC, and Sapphire Sky Wind Energy LLC Trading Symbol Trading Symbol Letters of credit issued inside credit facilities Letters of Credit Outstanding, Amount Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Stock options granted, weighted average exercise price Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Effective Income Tax Rate Reconciliation, Percent Effective Income Tax Rate Reconciliation, Percent [Abstract] Cash acquired Cash Acquired from Acquisition Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Requested common equity component average (as a percent) Public Utilities, Requested Equity Capital Structure, Percentage Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-Lived Intangible Assets, Major Class Name [Domain] Net realized and unrealized losses included in earnings Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings Schedule of Equity Method Investments [Table] Schedule of Equity Method Investments [Table] Prepaid taxes Prepaid Taxes Federal excess deferred tax amortization, percentage Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent Energy Related Inventory Energy Related Inventory [Abstract] Service cost Defined Benefit Plan, Service Cost Debt conversion terms two Debt Conversion Terms Two [Member] Debt Conversion Terms Two Executive Category: Executive Category [Axis] Asset acquisition, total consideration transferred Asset Acquisition, Total Consideration Transferred Asset Acquisition, Total Consideration Transferred Level 1 Fair Value, Inputs, Level 1 [Member] Carrying amount Reported Value Measurement [Member] Total guarantees Guarantor Obligations, Maximum Exposure, Undiscounted Equity Components [Axis] Equity Components [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Credit Losses Credit Loss, Financial Instrument [Policy Text Block] WE and WPS WE and WPS [Member] WE and WPS Stock options granted Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Smaller reporting company Entity Small Business 2027 Finite-Lived Intangible Asset, Expected Amortization, Year Four Local Phone Number Local Phone Number Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Uncollectible Expense Adjustment Rider Reconciliation Uncollectible Expense Adjustment Rider Reconciliation [Member] Annual reconciliation whereby costs recovered under the uncollectible expense adjustment rider are reviewed for accuracy and prudency. Mercury and Air Toxics Standards Mercury and Air Toxics Standards [Member] Represents information related to the mercury and air toxics standards [Member] 2029 Finance Lease, Liability, to be Paid, Year Five Letter of credit Letter of Credit [Member] Measurement Frequency [Axis] Measurement Frequency [Axis] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Pension and OPEB costs Pension and OPEB benefits Pension and Other Postretirement Plans Costs [Member] Retirement Benefits [Abstract] Retirement Benefits [Abstract] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Line of Credit Facility [Table] Line of Credit Facility [Table] Cash collateral posted Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset Transmission Affiliates Transmission Affiliates [Member] Represents American Transmission Company, LLC (ATC) and ATC Holdco, LLC. ATC is a for-profit, transmission only company that owns, maintains, monitors, and operates electric transmission assets. ATC Holdco, LLC is a separate entity formed to invest in transmission-related projects outside of ATC's traditional footprint. Public Utilities, General Disclosures [Line Items] Public Utilities, General Disclosures [Line Items] Early redemption terms Early Redemption Terms [Member] Early Redemption Terms Operating revenues Total operating revenues Revenues Short-term borrowings Short-Term Debt [Line Items] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Award Type [Axis] Award Type [Axis] Awards granted Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Document Quarterly Report Document Quarterly Report Significant non-cash investing and financing transactions Noncash Investing and Financing Items [Abstract] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Hedging Designation [Axis] Hedging Designation [Axis] Plant retirement related items Stranded Costs [Member] Revenue Subject to Refund Revenue Subject to Refund [Member] Goodwill Goodwill [Line Items] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Accounts Receivable, Allowance for Credit Loss [Roll Forward] We Power revenues We Power revenues [Member] Represents revenues consisting of the amortization of carrying costs recorded in deferred revenue and resulted from the previous construction of the We Power electric generating units. PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount MPSC MichiganPublicServiceCommissionMPSC [Member] Represents the Michigan Public Service Commission (MPSC), which regulates the operations of Upper Michigan Energy Resources Corporation (UMERC) and Michigan Gas Utilities Corporation (MGU). LEASES Lessee, Finance Leases [Text Block] Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets LIFO liquidation debit Excess of Replacement or Current Costs over Stated LIFO Value Climate Change Climate Change [Member] Represents information related to climate change as defined by the EPA's Clean Power Plan. Guarantees expiring within 1 to 3 years Guarantee Obligations Maximum Exposure Expire Within One To Three Years Represents the maximum potential payments with respect to the entity's guarantees that expire within one to three years. Charges to ATC for services and construction Related Party Transaction, Charges To Related Party Charges to related parties for services, construction, and/or operations (excluding transactions that are eliminated in consolidated or combined financial statements) during the period. Offsetting derivative liabilities Offsetting Derivative Liabilities [Abstract] Manufactured gas plant remediation Environmental Remediation Obligations [Abstract] PGL The Peoples Gas Light And Coke Company [Member] This element represents details pertaining to The Peoples Gas Light & Coke Company (PGL). Stock Issued - Stock investment plan Stock Issued During Period, Shares, Employee Stock Purchase Plans Environmental remediation costs Environmental Restoration Costs [Member] Number of applicable GHG limits for new simple cycle natural gas-fired combustion turbines Number of Applicable GHG Limits for New Simple cycle Natural Gas-Fired Combustion Turbines Number of Applicable GHG Limits for New Simple Cycle Natural Gas-Fired Combustion Turbines Property, plant, and equipment Property, Plant and Equipment [Line Items] Requested return on equity (as a percent) Public Utilities, Requested Return on Equity, Percentage Lease name [Domain] Counterparty Name [Domain] Public Service Commission of Wisconsin (PSCW) Public Service Commission Of Wisconsin PSCW [Member] Represents the Public Service Commission of Wisconsin (PSCW), which regulates the operations of Wisconsin Public Service Corporation (WPS), Wisconsin Electric Power Company (WE), and Wisconsin Gas LLC (WG). Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Accounts receivable and unbilled revenues Accounts Receivable, before Allowance for Credit Loss Long-term derivative liabilities Derivative Instruments and Hedges, Liabilities, Noncurrent Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Security Exchange Name Security Exchange Name Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Stock options Share-Based Payment Arrangement, Option [Member] DERIVATIVE INSTRUMENTS Derivative Instruments and Hedging Activities Disclosure [Text Block] Schedule of changes to our investments in transmission affiliates Schedule Of Changes To Equity Method Investments [Table Text Block] Tabular reconciliation of beginning and ending balances of investments accounted for under the equity method of accounting. Removal costs Removal Costs [Member] Uncollectible expense Uncollectible Expense [Member] Rate action of a regulator resulting in capitalization or accrual of the difference between uncollectible expense recovered in rates and the actual uncollectible write-offs. Total operating expenses Operating expenses Costs and Expenses Asset Acquisition [Table] Asset Acquisition [Table] Maximum Maximum [Member] Total Utility Operations Public Utility [Member] Public utility operations Document type Document Type Regulatory Agency [Axis] Regulatory Agency [Axis] Schedule of significant related party transactions with ATC Schedule of Related Party Transactions [Table Text Block] Tabular List, Table Tabular List [Table Text Block] Number of new ELG rule requirements that affect our electric utilities Number of New ELG Requirements The number of new ELG Requirements that affect us Bluewater Bluewater [Member] Rate action of a regulator resulting in capitalization or accrual of the difference between actual storage costs and those included in rates. Wisconsin Wisconsin [Member] The Wisconsin segment includes the operations of Wisconsin Electric Power Company, Wisconsin Public Service Corporation, Wisconsin Gas LLC, and Upper Michigan Energy Resources Corporation. 2027 Finance Lease, Liability, to be Paid, Year Three MERC Minnesota Energy Resources Corporation [Member] This element represents details pertaining to Minnesota Energy Resources Corporation (MERC). Basis of accounting Basis of Accounting, Policy [Policy Text Block] Notional sales volumes Derivative, Nonmonetary Notional Amount, Energy Measure Accounts receivable and unbilled revenues, reserves Accounts Receivable, Allowance for Credit Loss, Current Trade name Trademarks and Trade Names [Member] Public Utilities, Regulatory Proceeding [Domain] Public Utilities, Regulatory Proceeding [Domain] Schedule of credit agreements and remaining available capacity Schedule of Line of Credit Facilities [Table Text Block] Other long-term assets (restricted cash) Restricted cash included in other long-term assets Restricted Cash, Noncurrent Derivative [Table] Derivative [Table] Schedule of summarized income statement data for ATC Schedule Of Equity Method Investments Summarized Income Statement Data [Table Text Block] Tabular disclosure of summarized income statement data related to significant equity method investments. Schedule of receivables and payables with ATC Schedule Of Related Party Transactions Balance Sheet Information [Table Text Block] Tabular disclosure of balance sheet information related to transactions entered into with related parties. Acquisition of Whitewater Payments for Assets Acquisition Three, Net of Cash Acquired Aggregate cash payments for a third transaction that is classified as an investing activity in which assets, which may include securities, other types of investments, or productive assets, are purchased from third-party sellers. Title of 12(b) Security Title of 12(b) Security Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Acquisitions Asset Acquisition [Line Items] Asset Acquisition [Line Items] Indefinite-lived intangible asset Indefinite-Lived Intangible Assets (Excluding Goodwill) Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Operating Segments Operating Segments [Member] Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Purchase of additional ownership interest in Samson I from noncontrolling interest Payments to Noncontrolling Interests Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Schedule of gross receivables and related allowances for credit losses Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Joint plant ownership percentage Jointly Owned Utility Plant, Proportionate Ownership Share Entity Tax Identification Number Entity Tax Identification Number Percentage of first 15 basis points of additional earnings retained by the utility Percentage of first 15 basis points of additional earnings retained by the utility Percentage of first 15 basis points of additional earnings retained by the utility Cross State Air Pollution Rule - Good Neighbor Rule Cross State Air Pollution Rule [Member] Represents information related the rule revision of the Cross State Air Pollution Rule Schedule of Regulatory Liabilities [Table] Schedule of Regulatory Liabilities [Table] Statistical Measurement [Axis] Statistical Measurement [Axis] Upstream Upstream Wind Energy LLC [Member] Upstream Wind Energy LLC is a commercially operational wind generating facility located in Antelope County, Nebraska that supplies energy to the Southwest Power Pool. Other current assets Increase (Decrease) in Other Current Assets Contractual interest expense Interest Expense, Debt, Excluding Amortization PPAs Customer Contracts [Member] Entity Interactive Data Current Entity Interactive Data Current Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] LONG-TERM DEBT Long-Term Debt [Text Block] AROs Balance at January 1 Balance at June 30 Asset Retirement Obligation Schedule of convertible debt interest expense Convertible Debt Interest Expense [Table Text Block] Convertible Debt Interest Expense Acquisition of Sapphire Sky, net of cash acquired of $0.3 Payments to Acquire Assets, Investing Activities Percentage of earnings in excess of 75 basis points refunded to customers Percentage of earnings in excess of 75 basis points refunded to customers Percentage of utility earnings in excess of 75 basis points above the utility’s authorized return on equity (ROE) that will be refunded to customers. New primary annual PM2.5 level New Primary Annual PM2.5 Level Represents the new primary annual PM2.5 level that the EPA finalized. Amount of assurance that PGL's QIP rider costs will be recoverable AmountOfAssuranceCostsRecoverable Amount of assurance that the costs incurred under riders will be recoverable. Stock-based compensation Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Measure: Measure [Axis] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Name Outstanding Recovery, Individual Name Duration of offtake agreement for the sale of energy produced Duration of offtake agreement for the sale of energy produced Duration of offtake agreement for the sale of energy produced Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Investments held in rabbi trust Equity Securities, FV-NI Lease [Axis] Counterparty Name [Axis] Other Other retail customer [Member] Represents customers in a sector of the economy consisting of companies engaged in other business activities Derivative instruments Derivatives, Policy [Policy Text Block] 2024 Finite-Lived Intangible Asset, Expected Amortization, Year One Public Utility, Property, Plant and Equipment [Table] Public Utility, Property, Plant and Equipment [Table] Common stock, shares outstanding Common Stock, Shares, Outstanding, Beginning Balance Common Stock, Shares, Outstanding, Ending Balance Common Stock, Shares, Outstanding Interest cost Defined Benefit Plan, Interest Cost Noncontrolling interests Other Noncontrolling Interests PEO PEO [Member] Stock-based compensation and other Stockholders' Equity, Other Employee Benefit Plans Defined Benefit Plan Disclosure [Line Items] EMPLOYEE BENEFITS Retirement Benefits [Text Block] Other operation and maintenance Other operation and maintenance Other Cost and Expense, Operating Long-term assets Noncurrent assets Assets, Noncurrent Schedule of Common Stock Outstanding Roll Forward Schedule of Common Stock Outstanding Roll Forward [Table Text Block] Other, net Other Operating Activities, Cash Flow Statement Threshold percentage of trigger Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger Schedule of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] State income taxes net of federal tax benefit, amount Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Percent capacity factor that if combined cycle natural gas plants are above it causes the rule to be highly dependent on hydrogen or carbon capture Percent Capacity Factor for Combined Cycle Natural Gas Plants Represents the percent capacity factor for combined cycle plants that if they are above this percentage the rule is highly dependent on hydrogen as an alternative fuel, or carbon capture. Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Red Barn Wind Park Red Barn Wind Park [Member] Red Barn Wind Park Estimated future employer contributions for the remainder of the year Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year Debt Instrument [Axis] Debt Instrument [Axis] Changes to the carrying amount of goodwill Goodwill, Period Increase (Decrease) Cash collateral Derivative, Collateral [Abstract] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Six months ended December 31, 2024 Finance Lease, Liability, to be Paid, Remainder of Fiscal Year Credit Facility [Axis] Credit Facility [Axis] Natural gas Natural Gas, US Regulated [Member] Requested rate increase Public Utilities, Requested Rate Increase (Decrease), Amount COMMON EQUITY Shareholders' Equity and Share-Based Payments [Text Block] Delilah Solar Energy LLC Delilah I Solar Energy Center LLC [Member] Delilah I Solar Energy Center LLC is a solar generating facility under construction in Lamar County, Texas. Measurement Frequency [Domain] Measurement Frequency [Domain] PROPERTY, PLANT, AND EQUIPMENT Property, Plant and Equipment Disclosure [Text Block] Manufactured Gas Plant Remediation Manufactured Gas Plant Remediation [Member] Represents remediation related to manufacturing gas and storing manufactured gas. Long-term liabilities Liabilities, Noncurrent [Abstract] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Jointly Owned Utility Plant, Proportionate Ownership Share of Capacity Jointly Owned Utility Plant, Proportionate Ownership Share of Capacity Jointly Owned Utility Plant, Proportionate Ownership Share of Capacity FTRs and TCRs Commodity Contract Transmission Congestion Rights [Member] Derivative instrument used to manage electric transmission congestion costs. Long-Lived Tangible Asset [Domain] Long-Lived Tangible Asset [Domain] WG Wisconsin Gas LLC [Member] This element represents details pertaining to Wisconsin Gas LLC (WG). Net book value of plant to be retired Public Utilities, Property, Plant and Equipment, Net Refunds required to customers Refunds required to customers The total amount required to be refunded to customers as a result of a legal settlement or order. Approved rate increase Public Utilities, Approved Rate Increase (Decrease), Amount Weighted average interest rate on amounts outstanding Short-Term Debt, Weighted Average Interest Rate, at Point in Time Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Previous level of particulate matter in pounds per million british thermal unit Previous Level of Particulate Matter in Pounds per Million British Thermal Unit Previous Level of Particulate Matter in Pounds per Million British Thermal Unit prior to the EPA's final rule published in the Federal Register in May 2024. Current assets Current assets Assets, Current Schedule of short-term borrowings and weighted-average interest rates Schedule of Short-Term Debt [Table Text Block] Preferred stock of subsidiary Preferred Stock [Member] Equity investment in transmission affiliates Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Net periodic benefit (credit) cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Supplemental cash flow information Supplemental Cash Flow Information [Abstract] Residential Residential customer [Member] Represents customers of a sector of the economy consisting of residential dwellings. Amortization Amortization Purchase obligations Purchase Obligation Current derivative liabilities balance sheet location Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration] Short-term Debt, Type [Domain] Short-Term Debt, Type [Domain] Acquisition of West Riverside Payments for Asset Acquisition Four, net of cash acquired Aggregated cash payments for a fourth transaction that is classified as an investing activity, in which assets, which may include securities, other types of investments, or productive assets, are purchased from third-party sellers. GOODWILL AND INTANGIBLES Goodwill and Intangible Assets Disclosure [Text Block] NEW ACCOUNTING PRONOUNCEMENTS Accounting Standards Update and Change in Accounting Principle [Text Block] Total regulatory liabilities Regulatory liability Regulatory Liability Number of applicable GHG performance standards for coal plants Number of Applicable GHG Performance Standards for Coal Plants Represents the number of applicable GHG performance standards applicable to Coal Plants until 2032. Debt Conversion, Name [Domain] Debt Conversion, Name [Domain] State income taxes net of federal tax benefit, percentage Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Ownership interest of wind generating facility acquired Ownership interest of wind generating facility acquired Represents the ownership interest of the wind generating facility acquired 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Five Restricted shares granted, weighted-average grant date fair value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Regulatory liabilities Regulatory liabilities Regulatory Liability, Noncurrent Settlements Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements Other Postretirement Benefits Other Postretirement Benefits Plan [Member] 2028 Finance Lease, Liability, to be Paid, Year Four Cash received from sale of production tax credits Sale Of Production Tax Credits Cash Received Cash received during the period from the sale of production tax credits to third parties. Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Schedule of amortization over the next five years Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Steam Electric Effluent Limitation Guidelines Steam Electric Effluent Guidelines [Member] Represents information related to the EPA's final steam electric effluent guidelines rule that took effect in January 2016. INVESTMENT IN TRANSMISSION AFFILIATES Equity Method Investments and Joint Ventures Disclosure [Text Block] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Amortization of prior service (credit) cost Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Unsecured debt Unsecured Debt Accounts receivable for services provided to ATC Accounts and Other Receivables, Net, Current Depreciation and amortization Depreciation, Depletion and Amortization Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Transferred over time Transferred over Time [Member] Impairment of Samson I Impairment of Ongoing Project Business Combination and Asset Acquisition [Abstract] Commercial paper Commercial Paper [Member] Consolidation Items [Axis] Consolidation Items [Axis] Wind generation revenues Alternative Energy [Member] Customer credit balances Increase (Decrease) in Deferred Revenue Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Realized gains and losses on derivatives income statement location Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Current level of micrograms per cubic meter that particulate matter needs to be below Annual Standard for the Particulate Matter NAAQS Represents the annual standard for the particulate matter NAAQS that needs to be below 12 micrograms per cubic meter, while retaining the 24-hour standard. Air quality Environmental Compliance Obligations Air Quality [Abstract] -- None. No documentation exists for this element. -- Asset retirement obligations Asset Retirement Obligation Costs [Member] Types of Operating Revenues [Axis] Types of Operating Revenues [Axis] The disaggregating of operating revenues into different types. Long-term debt (June 30, 2024 and December 31, 2023 include $80.9 and $85.3, respectively, related to WEPCo Environmental Trust) Long-Term Debt and Lease Obligation VARIABLE INTEREST ENTITIES Variable Interest Entity Disclosure [Text Block] Schedule of regulatory assets and reserves related to manufactured gas plant sites Other Commitments [Table Text Block] Increase in receivables related to insurance proceeds Receivable Increase Insurance Proceeds Increase in the receivables related to insurance proceeds considered to be a noncash investing or financing activity. Interim rate refunds made to customers Increase (Decrease) in Regulatory Liabilities Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] Emerging growth company Entity Emerging Growth Company Number of existing coal categories that were kept as part of the 2024 supplemental ELG rule requirements Number of existing coal categories that were kept as part of the 2024 Supplemental ELG Rule Requirements Number of existing coal categories that were kept as part of the 2024 Supplemental ELG Rule Requirements Changes to investments in transmission affiliates Equity Method Investments [Roll Forward] A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. WEC Energy Group Parent Company [Member] RICE Unit megawatts RICE Unit Megawatt Rating Represents the amount of a RICE Unit's Megawatt Rating WEC 4.375% Convertible Notes due June 1, 2027 WEC 4.375% Convertible Notes due June 1, 2027 [Member] WEC 2027 Convertible Notes Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Title Trading Arrangement, Individual Title Principal amount conversion rate applied to Principal amount conversion rate applied to Principal amount of notes that the conversion rate will be applied to Common stock Common Stock [Member] WEC 0.80% Senior Notes $600M due March 15, 2024 WEC 0.80% Senior Notes $600M due March 15, 2024 [Member] WEC 0.80% Senior Notes $600M due March 15, 2024 Individual: Individual [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Income Statement Location [Domain] Income Statement Location [Domain] Alternative revenues Alternative revenues utility [Member] Represents revenues that are created from programs authorized by regulators that allow utilities to record additional revenues by adjusting rates in the future. Balance at the beginning of the period Balance at the end of the period Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs Balance Balance Equity, Including Portion Attributable to Noncontrolling Interest Derivative assets Total derivative assets Gross amount recognized on the balance sheet Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement Distributions to noncontrolling interests Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Minimum Minimum [Member] Property, plant, and equipment, net of accumulated depreciation and amortization of $11,263.4 and $11,073.1, respectively Property, Plant and Equipment, Net Late payment charges Late payment charges [Member] Represents revenues from late payment charges Less: Distributions Proceeds from Equity Method Investment, Distribution Additional capital spend approved us-gaap_PublicUtilitiesApprovedAdditionalCapitalSpend Amount of additional capital spend approved by the state regulatory commission. Other comprehensive loss Other Comprehensive Income (Loss), Net of Tax Compliance costs through 2023 associated with the ELG rule that were required to achieve discharge limits Environmental Capital And Operating Costs The capital and operating costs needed to achieve the required level of reduction in emissions. Period of amortization Period of amortization Period of amortization over a future period of time Asset Acquisition [Line Items] Statement of Cash Flows [Abstract] Assets Assets Assets [Abstract] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Acquisition purchase price, expected Asset Acquisition, Price of Acquisition, Expected Issuance of long-term debt Proceeds from Issuance of Long-Term Debt Schedule of derivative assets and liabilities Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Liabilities Liabilities [Abstract] OCPP OCPP [Member] Oak Creek Power Plant (OCPP), which is owned by WE. Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Retirement Plan Type [Axis] Retirement Plan Type [Axis] Leases Lessee, Lease, Description [Line Items] COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Diluted (in dollars per share) Income (Loss) from Continuing Operations, Per Diluted Share Other, net Payments for (Proceeds from) Other Investing Activities Capital contributions to transmission affiliates Add: Capital contributions Payments to Acquire Interest in Subsidiaries and Affiliates Retained earnings Retained Earnings [Member] Current portion of long-term debt (June 30, 2024 and December 31, 2023 include $9.1 and $9.0, respectively, related to WEPCo Environmental Trust) Current portion of long-term debt Long-Term Debt, Current Maturities Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Insurance receivable Insurance Settlements Receivable Minimum annual costs included in UEA rider during open reconciliation years Minimum annual costs included in UEA rider Minimum combined annual costs of PGL and NSG included in the UEA rider between 2019 and 2023. UMERC UMERC [Member] This element represents details pertaining to Upper Michigan Energy Resources Corporation (UMERC). Accounting Policies [Abstract] Accounting Policies [Abstract] Current derivative assets balance sheet location Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration] Minnesota Public Utilities Commission (MPUC) Minnesota Public Utilities Commission (MPUC) [Member] Minnesota Public Utilities Commission (MPUC) Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Purchases Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases Other guarantees Guarantee Type, Other [Member] Schedule of convertible debt Convertible Debt [Table Text Block] Common stock issued for stock-based compensation plans Stock Issued Consolidation Consolidation, Policy [Policy Text Block] Long-term liabilities Liabilities, Noncurrent Proceeds from issuance of debt Proceeds from Issuance of Debt Trading days prior to maturity Trading days prior to maturity Number of scheduled trading days immediately preceding the maturity date of such series of notes. Document Transition Report Document Transition Report Award Timing Predetermined Award Timing Predetermined [Flag] Weighted-average interest rate on amounts outstanding during the period Short-Term Debt, Weighted Average Interest Rate, over Time Proceeds from the sale of assets Proceeds from Sales of Business, Affiliate and Productive Assets Accounts payable Increase (Decrease) in Accounts Payable Net unrealized gains included in earnings related to investments held at end of period Equity Securities, FV-NI, Unrealized Gain Fair value measurements Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] PTCs, net, amount Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Abstract] Pension and Other Postretirement Plans Cost Pension and Other Postretirement Plans Cost [Member] Rate action of regulatory resulting in escrow accounting of pension/OPEB costs Derivative Instrument [Axis] Derivative Instrument [Axis] All Trading Arrangements All Trading Arrangements [Member] All Adjustments to Compensation All Adjustments to Compensation [Member] Timing of Transfer of Good or Service [Domain] Timing of Transfer of Good or Service [Domain] PTCs, net, percentage Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent Compensation Amount Outstanding Recovery Compensation Amount Resale Resale Customers [Member] Represents customers of a sector of the economy who purchase energy from an energy market operated by MISO at market rates based on availability of the utilities' generation and market demand. Equity Method Investment, Nonconsolidated Investee [Axis] Equity Method Investment, Nonconsolidated Investee [Axis] Provision for credit losses Accounts Receivable, Credit Loss Expense (Reversal) SHORT-TERM DEBT AND LINES OF CREDIT Short-Term Debt [Text Block] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Reconciling Eliminations Consolidation, Eliminations [Member] Exercise of stock options Proceeds from Stock Options Exercised Illinois Commerce Commission (ICC) Illinois Commerce Commission ICC [Member] Represents the Illinois Commerce Commission (ICC), which regulates the operations of The Peoples Gas Light and Coke Company (PGL) and the operations of North Shore Gas Company (NSG). Finance lease obligations Present value of minimum lease payments Finance Lease, Liability Past due greater than 90 days - collection risk mitigated by regulatory mechanisms Percent of accounts receivable past due greater than 90 days, with regulatory mechanisms to collect Percent of accounts receivable past due greater than 90 days with regulatory mechanisms to mitigate collection risk Equity method investments Equity Method Investments [Policy Text Block] Allowance for credit losses Balance at beginning of period Balance at end of period Accounts Receivable, Allowance for Credit Loss WE Wisconsin Electric Power Company [Member] This element represents details pertaining to Wisconsin Electric Power Company (WE). Schedule Of Segment Reporting Information By Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Schedule of changes to asset retirement obligations Schedule of Change in Asset Retirement Obligation [Table Text Block] Property and revenue taxes Taxes, Miscellaneous Reserves for future environmental remediation Accrual for Environmental Loss Contingencies Schedule of Guarantor Obligations [Table] Schedule of Guarantor Obligations [Table] Document period end date Document Period End Date Adoption Date Trading Arrangement Adoption Date Revenues from contracts with customers Revenue from Contract with Customer Benchmark [Member] Credit Loss [Abstract] Credit Loss [Abstract] Amortization to be recorded as an increase to operating revenues Sales [Member] Long-term lease liabilities Finance Lease, Liability, Noncurrent Weighted average discount rate - finance leases Finance Lease, Weighted Average Discount Rate, Percent Energy efficiency programs Energy Efficiency Programs [Member] Rate action of a regulator resulting in capitalization or accrual of costs related to energy efficiency programs. Rollforward of the allowances for credit losses by reportable segment Accounts Receivable, Allowance for Credit Loss [Table Text Block] Electric Electricity, US Regulated [Member] Segment information Segment Reporting Information [Line Items] Schedule of future minimum lease payments for Renegade finance lease Finance And Operating Lease Liability Maturity [Table Text Block] Tabular disclosure of undiscounted cash flows for finance and operating lease liabilities. Includes, but is not limited to, reconciliation of undiscounted cash flows to finance and operating lease liabilities recognized in the statement of financial position. Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Income tax expense Total income tax expense, amount Income tax expense (benefit) Income Tax Expense (Benefit) Designated as hedging instrument Designated as Hedging Instrument [Member] Write-offs charged against the allowance Accounts Receivable, Allowance for Credit Loss, Writeoff Finance lease right of use asset Finance Lease, Right-of-Use Asset, after Accumulated Amortization FAIR VALUE MEASUREMENTS Fair Value Disclosures [Text Block] Common shareholders' equity Equity [Abstract] MATERIALS, SUPPLIES, AND INVENTORIES Inventory Disclosure [Text Block] Amounts due from ATC for transmission infrastructure upgrade Other Receivables, Net, Current Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Oak Creek Power Plant Units 5 and 6 Public Utility, Property, Plant and Equipment [Line Items] Preferred stock dividends of subsidiary Preferred Stock Dividends, Income Statement Impact Effective Income Tax Rate Reconciliation, Amount Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] Amortization of net actuarial (gain) loss Defined Benefit Plan, Amortization of Gain (Loss) Natural gas storage needs provided to Wisconsin utilities PercentageOfStorageNeedsProvidedByStorageFacility Percentage of the company's Wisconsin natural gas storage needs provided by the natural gas storage facility. Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest System support resource SystemSupportResource [Member] Rate action of a regulator resulting in capitalization or accrual of the difference between the amount of system support resource payments from the Midcontinent Independent System Operator (MISO) authorized for recovery and the amount actually received. Credit Facility [Domain] Credit Facility [Domain] Net amount Derivative Asset, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Jointly Owned Utility Plant [Domain] Jointly Owned Utility Plant [Domain] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Number of derivative instruments Derivative, Number of Instruments Held Public Utilities General Disclosures [Table] Public Utilities General Disclosures [Table] ATC Holdco ATC Holdco LLC [Member] Information related to ATC Holdco, LLC, a separate entity formed in December 2016 to invest in transmission-related projects outside of ATC's traditional footprint. Long-term derivative liabilities balance sheet location Derivative Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Asset retirement obligations Asset Retirement Obligation Disclosure [Text Block] Less: interest Finance Lease, Liability, Undiscounted Excess Amount Regulated Operations [Abstract] Regulated Operations [Abstract] OPERATING REVENUES Revenue from Contract with Customer [Text Block] Additional paid in capital Additional Paid in Capital, Common Stock Additional paid in capital Additional Paid-in Capital [Member] Proceeds from the sale of investments held in rabbi trust Proceeds from Sale of Equity Securities, FV-NI Repayment of long-term debt Repayments of Unsecured Debt Equity in earnings of transmission affiliates Add: Earnings from equity method investment Income (Loss) from Equity Method Investments Environmental matters Loss Contingencies [Line Items] Cover [Abstract] Cover [Abstract] Payments for debt extinguishment and issuance costs Payments for debt extinguishment and issuance costs Amount of cash outflow from early extinguishment, prepayment of debt, and debt issuance costs. Includes, but is not limited to, third-party costs, premium paid, and other fees paid to lender directly for debt extinguishment or prepayment. Also includes amounts paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. Amortization of debt issuance costs Amortization of Debt Issuance Costs Whitewater cogeneration facility Whitewater Cogeneration Facility [Member] A dual fueled (natural gas and low sulfur fuel oil) combined cycle electrical generation facility located in Whitewater, Wisconsin. Other prepayments Other Prepaid Expense, Current Fair value measurements on a recurring basis Fair Value, Recurring [Member] Other Other noncurrent liabilities Other Liabilities, Noncurrent Schedule of outstanding guarantees Schedule of Guarantor Obligations [Table Text Block] Schedule of supplemental cash flow information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Charges from ATC for network transmission services Operating Expenses Acquisition purchase price Asset Acquisition, Consideration Transferred Types of Operating Revenues [Domain] Types of Operating Revenues [Domain] Types of Operating Revenues [Domain] SEGMENT INFORMATION Segment Reporting Disclosure [Text Block] Net change in cash, cash equivalents, and restricted cash Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Equity Component [Domain] Equity Component [Domain] Less: short-term lease liabilities Finance Lease, Liability, Current Contributions and payments related to pension and OPEB plans Contributions and payments related to pension and OPEB plans Payment for Pension and Other Postretirement Benefits Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Long-term Debt, Unclassified [Abstract] Long-Term Debt, Unclassified [Abstract] Entity Current Reporting Status Entity Current Reporting Status Level 3 rollforward Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract] Reconciliation of cash, cash equivalents, and restricted cash Reconciliation Of Cash And Restricted Cash [Table Text Block] Tabular reconciliation of cash, cash equivalents, and restricted cash reported within the balance sheets to the amounts shown in the statements of cash flows. Acquisition of noncontrolling interests Noncontrolling Interest, Increase from Business Combination Operating income Operating Income (Loss) LIFO Method Related Items LIFO Method Related Items [Abstract] Consolidated Entities [Domain] Consolidated Entities [Domain] Samson I Samson I Solar Energy Center Samson I Solar Energy Center LLC [Member] Samson I Solar Energy Center LLC is a commercially operational solar generating facility located in Lamar County, Texas. Additions Asset Retirement Obligation, Liabilities Incurred Segments [Axis] Segments [Axis] Fair value Estimate of Fair Value Measurement [Member] Other comprehensive loss, net of tax Other Comprehensive Income (Loss), Net of Tax [Abstract] Change in allowance for credit losses Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) Regulatory Asset [Axis] Regulatory Asset [Axis] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Environmental remediation liabilities Accrued Environmental Loss Contingencies, Noncurrent Collateral on deposit Increase (Decrease) in Deposit Assets Percent capacity factor for simple cycle natural gas fired combustion turbines that there are no applicable limits if the capacity factor is less than this. Percent Capacity Factor for Simple Cycle Natural Gas Fired Combustion Turbines Represents the percent capacity factor for simple cycle natural gas fired combustion turbines that there are no applicable limits if the capacity factor is below. Land Lease - Utility Solar Generation Land Lease - Utility Solar Generation [Member] Land Lease - Utility Solar Generation Deferred income taxes and ITCs, net Deferred Income Taxes and Tax Credits Consolidated Entities [Axis] Consolidated Entities [Axis] Net loss attributed to noncontrolling interests Net loss attributed to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Pay vs Performance Disclosure [Line Items] Statistical Measurement [Domain] Statistical Measurement [Domain] Schedule of regulatory assets Schedule of Regulatory Assets [Table Text Block] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Materials and supplies Inventory, Raw Materials and Supplies, Net of Reserves Consecutive trading days Debt Instrument, Convertible, Threshold Consecutive Trading Days Income tax related items Deferred Income Tax Charge [Member] Samson I Solar Energy Center Electric Generation Equipment [Member] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Credit facility maturing September 2026 Revolving Credit Facility [Member] WEPCo Environmental Trust Variable Interest Entity, Primary Beneficiary [Member] Other non-utility revenues Other non-utility revenues [Member] Represents revenues not regulated under public utility regulations. These revenues include revenues from We Power, appliance service revenues, and distributed renewable solar project revenues. Equity Method Investments and Joint Ventures [Abstract] Equity Method Investments and Joint Ventures [Abstract] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Performance units Performance Shares [Member] Segment Reporting [Abstract] Segment Reporting [Abstract] Accounts payable Accounts payable for services received from ATC Accounts Payable, Current Discontinued Operations and Disposal Groups [Abstract] Discontinued Operations and Disposal Groups [Abstract] Weighted average common shares outstanding Weighted Average Common Shares Outstanding Millions [Abstract] Weighted Average Common Shares Outstanding (Millions). Restatement Determination Date: Restatement Determination Date [Axis] Investment, Name [Axis] Investment, Name [Axis] Other expense Other expense, net Nonoperating Income (Expense) Capacity of coal-fired generation retired, in megawatts Coal Generation Capacity Retired The capacity, in megawatts, of coal generation retired since the beginning of 2018 Statutory federal income tax, percentage Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Commitments and contingencies (Note 23) Commitments and Contingencies Coal contracts Coal Contract [Member] Customer credit balances Deferred Revenue, Current Public Utility [Axis] Public Utility [Axis] Issuance of common stock Proceeds from Issuance of Common Stock Schedule of Goodwill [Table] Schedule of Goodwill [Table] Period of time for EPA review of ozone plan Period of time for EPA Review of ozone plan Period of time that the EPA plans to review its Integrated Review Plan for ozone INCOME TAXES Income Tax Disclosure [Text Block] Revenue Recognition Revenue [Policy Text Block] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Jointly Owned Utility Plant [Axis] Jointly Owned Utility Plant [Axis] Fair Value, Assets and Liabilities Measured on Recurring Basis [Table] Fair Value, Recurring and Nonrecurring [Table] PEO Total Compensation Amount PEO Total Compensation Amount Rider QIP Reconciliation Rider QIP Reconciliation [Member] Annual reconciliation whereby costs recovered under the QIP rider are reviewed for accuracy and prudency. Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Goodwill balance by segment Goodwill [Roll Forward] Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Level 3 Fair Value, Inputs, Level 3 [Member] Total accounts receivable, net - past due greater than 90 days Accounts Receivable, Past Due Greater than 90 Days Amount of accounts receivable past due greater than 90 days Other current assets Regulatory Asset, Current Debt Conversion Description [Axis] Debt Conversion Description [Axis] Exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Current derivative assets Derivative Instruments and Hedges, Assets Electric transmission costs Electric Transmission Costs [Member] Rate action of a regulator resulting in capitalization or accrual of electric transmission costs. Proxy revenue swap Swap [Member] Fair value amount Long-Term Debt, Fair Value Stock options granted, weighted-average grant date fair value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Net income Net Income (Loss) Attributable to Parent Net Income (Loss) Attributable to Parent Current liabilities Current liabilities Liabilities, Current Derivative Contract [Domain] Derivative Contract [Domain] 2026 Finance Lease, Liability, to be Paid, Year Two Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Company Selected Measure Name Company Selected Measure Name Commercial paper outstanding Commercial Paper Other current liabilities (accrued interest) Interest Payable, Current Liabilities and Equity Liabilities and Equity [Abstract] Finite-Lived Intangible Liabilities Finite-Lived Intangible Assets [Line Items] Purchase of common stock Stock Repurchased During Period, Value Cost of sales Cost of Goods and Services Sold Weighted average remaining useful life Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life Name Measure Name Name Forgone Recovery, Individual Name Current derivative liabilities Hedging Liabilities, Current Lease [Domain] Lease [Domain] Lease [Domain] Goodwill Goodwill Goodwill Approved common equity component average (as a percent) Public Utilities, Approved Equity Capital Structure, Percentage Number Of Customers Number Of Customers The number of customers served by the entity. Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Fair Value, by Balance Sheet Grouping, Disclosure Item Amounts [Axis] Measurement Basis [Axis] Asset Acquisition [Domain] Asset Acquisition [Domain] Underlying Securities Award Underlying Securities Amount Fair Value Measurement [Domain] Fair Value Measurement [Domain] Change in commercial paper Proceeds from (Repayments of) Short-Term Debt, Maturing in Three Months or Less Common stock dividend declared (in dollars per share) Common Stock, Dividends, Per Share, Declared Small commercial and industrial Small commercial and industrial [Member] Represents customers in a sector of the economy consisting of companies engaged in small commercial and industrial activities. Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Reconciliation of changes in fair value of items categorized as level 3 measurements Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Income Statement Location [Axis] Income Statement Location [Axis] Stock Issued - 401(k) Stock Issued During Period, Shares, Employee Benefit Plan Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] CREDIT LOSSES Credit Loss, Financial Instrument [Text Block] Number of years between evaluation of attainment status Number of Years Between Evaluation of Attainment Status Number of years between evaluation of attainment status until attainment is achieved. Asset Retirement Obligation Disclosure [Abstract] 2026 Rates 2026 Rates [Member] 2026 rate case impacts Number of shares outstanding related to the potential conversion of the Notes included in diluted eps Weighted Average Number of Shares Outstanding, Diluted, Adjustment Other States Other States [Member] The other states segment includes the natural gas utility and non-utility operations of Minnesota Energy Resources Corporation and Michigan Gas Utilities Corporation. Other utility revenues Other utility [Member] Represents a customer whose revenues are a part of multiple customer classes combined or not specifically identifiable to any one customer. Schedule of carrying value and fair value of financial instruments not recorded at fair value Fair Value, by Balance Sheet Grouping [Table Text Block] Product and Service [Domain] Product and Service [Domain] Other Performance Measure, Amount Other Performance Measure, Amount National Ambient Air Quality Standards National Ambient Air Quality Standards [Member] Represents information related to the National Ambient Air Quality Standards Cash collateral posted Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset Steam Downtown Milwaukee Steam Customers [Member] Represents the Downtown Milwaukee (Valley) steam utility customers served by Wisconsin Electric Power Company. Materials, supplies, and inventories Increase (Decrease) in Inventories Standby letters of credit Standby Letters of Credit [Member] Investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Minimum future commitments for purchase obligations Unconditional Purchase Obligations (Excluding Capital Stock Redemptions) [Abstract] Liabilities settled Asset Retirement Obligation, Liabilities Settled Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Fossil fuel Energy Related Inventory, Other Fossil Fuel Interest expense Interest Expense Accounts payable related to construction costs Capital Expenditures Incurred but Not yet Paid Gain on early extinguishment of debt Gain (Loss) on Extinguishment of Debt Trading Arrangement: Trading Arrangement [Axis] Timing of Transfer of Good or Service [Axis] Timing of Transfer of Good or Service [Axis] Entity File Number Entity File Number Loss Contingencies [Table] Loss Contingencies [Table] Deferred revenue, net Deferred Revenue, Noncurrent Entity Shell Company Entity Shell Company Payments for ATC's construction costs that will be reimbursed Payments for Advance to Affiliate Restatement Determination Date Restatement Determination Date Other operating revenues Revenue Not from Contract with Customer Ownership interest of solar generating facility acquired Ownership interest of solar generating facility acquired Ownership interest of solar generating facility acquired Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Regulatory Agency [Domain] Regulatory Agency [Domain] Cash, cash equivalents, and restricted cash at beginning of period Cash, cash equivalents, and restricted cash at end of period Cash, cash equivalents, and restricted cash Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Approved rate increase (as a percent) Public Utilities, Approved Rate Increase (Decrease), Percentage Number of states that failed to submit timely SIP revisions to address nonattainment areas classified as "moderate" for the 2015 standard Number of States that Failed to Submit Timely SIP Revisions Represents the number of states that failed to submit timely SIP revisions to address nonattainment areas classified as "moderate" for the 2015 standard. Operating expense loans Loans Payable [Member] Net carrying amount Long-term debt, including current portion Long-Term Debt Decoupling Decoupling [Member] Rate action of a regulator resulting in capitalization or accrual of the differences between actual and authorized margins for certain customer classes. Appliance service revenues 811412 Appliance Repair and Maintenance [Member] WEC 4.375% Convertible Notes due June 1, 2029 WEC 4.375% Convertible Notes due June 1, 2029 [Member] WEC 2029 Convertible Notes Dividends payable Dividends Payable [Line Items] Schedule of stock-based compensation awards granted ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantedinPeriod [Table Text Block] Tabular disclosure of the number of equity awards granted during the period, including the weighted-average grant-date fair value and the weighted-average exercise price per award. Other, net Proceeds from (Payments for) Other Financing Activities Comprehensive income attributed to common shareholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent Trading days prior to redemption Trading days prior to redemption Number of scheduled trading days prior to the redemption date Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Wholesale Wholesale customer [Member] Represents a customer in a sector of the economy consisting of companies engaged in purchasing electric service from the utility and then reselling this electric service to their customers. ACQUISITIONS Asset Acquisition [Text Block] Financial instruments Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Provision for credit losses deferred for future recovery or refund Increase (Decrease) in Regulatory Assets and Liabilities Long-term derivative assets balance sheet location Derivative Asset, Noncurrent, Statement of Financial Position [Extensible Enumeration] 2025 Finance Lease, Liability, to be Paid, Year One Fair value measurements Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Current level of micrograms per cubic meter under 24-hour standard that particulate matter needs to be below 24-Hour Standard for Particulate Matter NAAQS 24-Hour Standard for Particulate Matter NAAQS Total regulatory assets Regulatory assets Total regulatory assets Regulatory Asset Subsequent event Subsequent Event [Member] Tatanka Ridge and Bishop Hill III Tatanka Ridge Wind LLC and Bishop Hill Energy III LLC [Member] This element represents details pertaining to Tatanka Ridge Wind LLC and Bishop Hill Energy III LLC Total retail revenues Total Retail Customers [Member] Represents a sector of the economy consisting of companies engaged in residential, commercial and industrial and other retail revenues. WECI WEC Infrastructure LLC [Member] This element represents details pertaining to WEC Infrastructure LLC (WECI), a subsidiary of WEC Energy Group, Inc. Schedule of intangible liabilities obtained through acquisitions by WECI Schedule of Finite-Lived Intangible Assets [Table Text Block] Other Other Liabilities, Current Income Statement [Abstract] Income Statement [Abstract] Schedule of Investments [Line Items] Schedule of Investments [Line Items] Stock Issued During Period, Shares, New Issues Stock Issued During Period, Shares, New Issues Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Components of net periodic benefit cost (credit) Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] Lease initial term Lessee, Finance Lease, Term of Contract Types of Non-Utility Operating Revenues [Domain] Types of Non-Utility Operating Revenues [Domain] [Domain] for Disaggregates non-utility operating revenues. Other Other Assets, Current Securitization Securitization Costs [Member] Rate action of a regulator resulting in capitalization or accrual of costs securitized (financed with debt) and recoverable through an approved charge. Statutory federal income tax, amount Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Other Operating Revenues [Abstract] Other Operating Revenues [Abstract] Other Operating Revenues [Abstract] Pension and OPEB assets Assets for Plan Benefits, Defined Benefit Plan Wisconsin Electric Power Company And Wisconsin Public Service Corporation Wisconsin Electric Power Company And Wisconsin Public Service Corporation [Member] This element represents details pertaining to Wisconsin Electric Power Company (WE) and Wisconsin Public Service Corporation (WPS). Dividends Payable [Table] Dividends Payable [Table] Proceeds from sale of real estate Proceeds from Sale of Other Real Estate Investment in transmission affiliates, balance at beginning of period Investment in transmission affiliates, balance at end of period Equity investment Equity Method Investments DISPOSITIONS Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Total Shareholder Return Amount Total Shareholder Return Amount Purchase of common stock Payments for Repurchase of Common Stock Entity common stock, shares outstanding Entity Common Stock, Shares Outstanding Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] MGU MGU [Member] Represents details pertaining to Michigan Gas Utilities Corporation, which is also referred to as MGU. Inventory Disclosure [Abstract] Inventory Disclosure [Abstract] Lease [Axis] Lease [Axis] Information by type of lease. Total common shareholders' equity Parent [Member] Segments [Domain] Segments [Domain] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Retained earnings Retained Earnings (Accumulated Deficit) Current assets Assets, Current [Abstract] Leases [Abstract] Leases [Abstract] Equity Method Investment, Nonconsolidated Investee [Domain] Equity Method Investment, Nonconsolidated Investee [Domain] Transportation Transportation customers [Member] Represents customers from a sector of the economy consisting of companies who purchase natural gas from a third party, but still transport the natural gas through our distribution systems. Entity Address, State or Province Entity Address, State or Province Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Maple Flats Solar Maple Flats Solar [Member] Maple Flats Solar Additional ownership interest acquired Additional ownership interest acquired Additional ownership interest acquired Gross amount not offset on the balance sheet Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset Total minimum lease payments Finance Lease, Liability, to be Paid Operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Guarantees Guarantor Obligations [Line Items] Basic (in dollars per share) Income (Loss) from Continuing Operations, Per Basic Share Guarantees with expiration over 3 years Guarantee Obligations Maximum Exposure Expire Over Three Years Represents the maximum potential payments with respect to the entity's guarantees that expire after three years. Number of Acres Sold NumberofAcresSold Number of acres of real estate sold Amounts recoverable from customers Amounts recoverable from customers The increase (decrease) during the reporting period in the amount due from customers for certain regulatory assets, including amounts recoverable for natural gas costs. Initial conversion price, per share Debt Instrument, Convertible, Conversion Price Initial conversion ratio Debt Instrument, Convertible, Conversion Ratio Earnings per share Earnings Per Share, Basic [Abstract] Accounts receivable and unbilled revenues, net Increase (Decrease) in Accounts and Other Receivables Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract] Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract] Additional acquisition purchase price Additional acquisition purchase price Additional acquisition purchase price Other operating revenues Other operating revenues [Member] Represents revenues of the company that have been evaluated under Accounting Standard Update 2014-09 and are not considered revenues from contracts with customers. Such operating revenues include alternative revenues, late payment charges, and lease revenue. Summarized financial data Equity Method Investment, Summarized Financial Information [Abstract] Koshkonong Solar Park Koshkonong Solar Park [Member] Koshkonong Solar Park Intangible liabilities Net carrying amount Intangible liabilities Intangible liabilities Operating expense loan outstanding Other Short-Term Borrowings Other, net, percentage Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Customer [Domain] Customer [Domain] Schedule of inventory Schedule of Inventory, Current [Table Text Block] Net income attributed to common shareholders Net income attributed to common shareholders Net income (loss) attributed to common shareholders Net Income (Loss) Available to Common Stockholders, Basic Jointly owned utility plant, proportionate ownership share of solar capacity Jointly Owned Utility Plant, Proportionate Ownership Share of Solar Capacity Jointly Owned Utility Plant, Proportionate Ownership Share of Solar Capacity Oak Creek Power Plant Units 5 and 6 Oak Creek Power Plant Units 5 And 6 [Member] Oak Creek Power Plant Units 5 and 6 are coal- fired power plants that Wisconsin Electric Power Company retired in May 2024. Total income tax expense, percent Effective Income Tax Rate Reconciliation, Percent GENERAL INFORMATION Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Asset Acquisition [Axis] Asset Acquisition [Axis] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Accumulated other comprehensive loss AOCI Attributable to Parent [Member] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount All Executive Categories All Executive Categories [Member] Steam Rate Request Steam Rate Request [Member] Represents information relating to steam rates. Net amount Derivative Liability, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Other, net, amount Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] WPS Wisconsin Public Service Corporation [Member] This element represents details pertaining to Wisconsin Public Service Corporation (WPS). Number of reportable segments Number of Reportable Segments Schedule of balance sheet impact of WEPCo Environmental Trust Schedule of Variable Interest Entities [Table Text Block] 2023 Rate Order 2023 Rate Order [Member] Impacts from PGL's and NSG's rate orders issued by the ICC in November 2023. Regulatory Asset [Domain] Regulatory Asset [Domain] Common stock – $0.01 par value; 650,000,000 shares authorized; 316,079,401 and $315,434,531 shares outstanding, respectively Common Stock, Value, Issued Debt instrument, redemption price, percentage Debt Instrument, Redemption Price, Percentage Illinois Illinois [Member] The Illinois segment includes the natural gas utility operations of North Shore Gas Company and The Peoples Gas Light and Coke Company. Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] New limit for particulate matter published in the EPA's final rule New Limit for Particulate Matter Published in the EPA's Final Rule New Limit for Particulate Matter Published in the EPA's Final Rule Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Accounts receivable and unbilled revenues, net Accounts Receivable, after Allowance for Credit Loss Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] All Individuals All Individuals [Member] Number of new categories that were created as part of the 2024 supplemental ELG rule requirements Number of new coal categories that were created as part of the 2024 Supplemental ELG Rule Requirements Number of new coal categories that were created as part of the 2024 Supplemental ELG Rule Requirements Regulatory assets Regulatory Asset [Line Items] Other income, net Other Nonoperating Income (Expense) Entity filer category Entity Filer Category Investment in transmission affiliates Schedule of Equity Method Investments [Line Items] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Statement [Table] Statement [Table] Current fiscal year end date Current Fiscal Year End Date Non-Utility Energy Infrastructure Non-Utility Energy Infrastructure [Member] The non-utility energy infrastructure segment includes We Power, which owns and leases generating facilities to WE, and Bluewater, which owns underground natural gas storage facilities in Michigan. It also includes WEC Infrastructure LLC, which holds our ownership interest in renewable generating facilities. Net unrealized losses included in earnings attributable to level 3 derivatives held at the end of the reporting period Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) Schedule of effective income tax rate reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] PEO Name PEO Name Credit facility maturing October 2024 Credit facility maturing October 2024 [Member] Credit facility maturing October 2024 Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Schedule of Product Information [Table] Schedule of Product Information [Table] Utility Plant [Domain] Utility Plant [Domain] Trading days prior to early redemption Trading days prior to early redemption Number of scheduled trading days immediately preceding their maturity date Other current assets (restricted cash) Restricted cash included in other current assets Restricted Cash, Current Schedule of goodwill balance by segment Schedule of Goodwill [Table Text Block] Debt conversion terms three Debt Conversion Terms Three [Member] Debt Conversion Terms Three Short-term Debt [Abstract] Short-Term Debt [Abstract] Public Utilities, Regulatory Proceeding [Axis] Public Utilities, Regulatory Proceeding [Axis] Regulatory Liability [Domain] Regulatory Liability [Domain] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Interest rate on long-term debt Debt Instrument, Interest Rate, Stated Percentage Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Schedule of estimated notional sales volumes and realized gains and losses Derivative Instruments, Realized Gain (Loss) and Notional Volumes [Table Text Block] Tabular disclosure of the amount of the realized gain (loss) and notional volumes for derivative instruments not designated as hedging instruments. Members' equity Equity, Attributable to Parent Schedule of Finite-Lived Intangible Liabilities [Table] Schedule of Finite-Lived Intangible Assets [Table] Securitization of environmental control costs related to Pleasant Prairie power plant Securitized Regulatory Asset Carrying value of the regulatory asset that represents capitalized costs that have been or will be securitized (financed with debt) and are expected to be recoverable through a charge approved by a regulator. Restricted shares Restricted Stock [Member] Finite-Lived Intangible Liabilities, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Debt conversion terms one Debt Conversion Terms One [Member] Debt Conversion Terms One Types of Other Operating Revenues [Axis] Types of Other Operating Revenues [Axis] Represents different types of other operating revenues Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Schedule of summarized balance sheet data for ATC Schedule Of Equity Method Investments Summarized Balance Sheet Data [Table Text Block] Tabular disclosure of summarized balance sheet data related to significant equity method investments. Fair value measurement Fair Value Measurement, Policy [Policy Text Block] Hedging Designation [Domain] Hedging Designation [Domain] Level 2 Fair Value, Inputs, Level 2 [Member] Amortization to be recorded as a decrease to other operation and maintenance Operating Expense [Member] Return on equity in excess of first 15 basis points above authorized amount (as a percent) Return on equity in excess of first 15 basis points above authorized amount (as a percent) Return on equity (ROE) in excess of the first 15 basis points above the authorized amount, for which a percentage will be returned to customers. Derivatives Deferred Derivative Gain (Loss) [Member] Guarantees [Abstract] Guarantees [Abstract] ATC American Transmission Company LLC [Member] Information related to American Transmission Company, LLC (ATC), a for-profit, transmission only company. ATC owns, maintains, monitors, and operates electric transmission assets. Approved return on equity (as a percent) Public Utilities, Approved Return on Equity, Percentage Schedule of Regulatory Assets [Table] Schedule of Regulatory Assets [Table] Amount of net accounts receivable with regulatory protections Amount of net accounts receivable with regulatory protections Amount of net accounts receivable and unbilled revenues with regulatory protections in place to mitigate the exposure to credit losses Utility operations Public Utilities Public Utilities [Member] Statements of equity Roll Forward of Common Stock Outstanding Increase (Decrease) in Stockholders' Equity [Roll Forward] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Acquisition of Samson I, net of cash acquired of $5.2 Payments for Asset Acquisition Two, Net of Cash Acquired Aggregate cash payments for a second transaction that is classified as an investing activity in which assets, which may include securities, other types of investments, or productive assets, are purchased from third-party sellers Document fiscal period focus Document Fiscal Period Focus Trading days Debt Instrument, Convertible, Threshold Trading Days Length of proxy revenue contract, in years Finite-Lived Intangible Asset, Useful Life Available capacity under existing credit facility Line of Credit Facility, Remaining Borrowing Capacity Acquisition of Red Barn Payments for Asset Acquisition Five, Net of Cash Acquired Aggregate cash payments for a fifth transaction that is classified as an investing activity in which assets, which may include securities, other types of investments, or productive assets, are purchased from third party sellers. City Area Code City Area Code Product and Service [Axis] Product and Service [Axis] Types of Other Operating Revenues [Domain] Types of Other Operating Revenues [Domain] [Domain] for Represents different types of other operating revenues Equity method investment, ownership interest (as a percent) Ownership interest (as a percent) Equity Method Investment, Ownership Percentage Document fiscal year focus Document Fiscal Year Focus Schedule of regulatory liabilities Schedule of Regulatory Liabilities [Table Text Block] Exercise Price Award Exercise Price Finite-Lived Intangible Liabilities by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Common stock dividends Dividends, Common Stock, Cash Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Derivative liabilities Derivative Liability [Abstract] Net income Net income Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Cash paid (received) for income taxes, net Income Taxes Paid, Net Guarantees expiring in less than 1 year Guarantee Obligations Maximum Exposure Expire Less Than One Year Represents the maximum potential payments with respect to the entity's guarantees that expire in less than a year. Electric Transmission Electric Transmission Segment [Member] The electric transmission segment includes our approximate 60% ownership interest in American Transmission Company, LLC (ATC) and our approximate 75% ownership interest in ATC Holdco LLC (ATC Holdco). Water quality Environmental Compliance Obligations Water Quality [Abstract] -- None. No documentation exists for this element. -- Derivatives accounted for as cash flow hedges Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax [Abstract] Total liabilities and equity Total liabilities and members' equity Liabilities and Equity Return on equity in excess of authorized amount (as a percent) Return on equity in excess of authorized amount (as a percent) Return on equity (ROE) in excess of authorized amount, for which the additional earnings will be retained by the utility. Other Other Assets, Noncurrent Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Sapphire Sky Sapphire Sky Wind Energy LLC [Member] Sapphire Sky Wind Energy LLC is a commercially operational wind generating facility located in McLean County, Illinois. Interconnection agreements Service Agreements [Member] Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Indefinite-lived Intangible Assets Indefinite-Lived Intangible Assets [Line Items] Intersegment revenues Intersegment Transactions [Member] Transactions with other operating units of the same entity. Arrangement Duration Trading Arrangement Duration Regulatory Liability [Axis] Regulatory Liability [Axis] Entity Address, City or Town Entity Address, City or Town Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Schedule of financial information related to our reportable segments Schedule of Segment Reporting Information, by Segment [Table Text Block] Number of months after May 2025 deadline for SIP that offset sanctions will take effect if the state SIP revision is not approved Number of Months After May 2025 Deadline for SIP That Offset SanctionsTake Effect if the State SIP Revision Isn't Approved Number of Months After May 2025 Deadline for SIP That Offset SanctionsTake Effect if the State SIP Revision Isn't Approved Disallowed capital costs Public Utilities, Property, Plant and Equipment, Amount of Disallowed Costs for Recently Completed Plant Gross amount not offset on the balance sheet Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset Equity income in transmission affiliates, net of distributions Income (Loss) from Equity Method Investments, Net of Dividends or Distributions Purchase of additional ownership interest in Samson I from noncontrolling interest Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Termination Date Trading Arrangement Termination Date Common stock, shares authorized Common Stock, Shares Authorized Company goal for percentage of carbon emissions reduction below 2005 levels by the end of 2030 Percent Carbon Dioxide Emission Reduction Future Goal The percentage by which the company plans to reduce carbon dioxide emissions below 2005 levels by the end of 2030. Commercial and industrial Commercial and Industrial Customer [Member] Represents customers of a sector of the economy consisting of companies engaged in commercial and industrial business activities. Short-term debt Short-Term Debt Maximum annual costs included in PGL's QIP rider during open reconciliation years Maximum annual costs included in PGL's QIP rider Maximum annual costs included in PGL's QIP rider between 2016 and 2022 Indefinite-lived Intangible Assets [Axis] Indefinite-Lived Intangible Assets [Axis] Capacity of fossil-fueled generation to be retired by the end of 2031, in megawatts Fossil-fueled Generation Capacity To Be Retired by 2031 The capacity, in megawatts, of fossil-fueled generation capacity to be retired by the end of 2031 Reconciliation to cash provided by operating activities Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Derivative instruments Derivative [Line Items] Award Timing Disclosures [Line Items] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Comprehensive loss attributed to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Average amount of commercial paper outstanding during the period Short-Term Debt, Average Outstanding Amount Long-term derivative assets Derivative Instruments and Hedges, Noncurrent Surety bonds Surety Bond [Member] Short-term Debt, Type [Axis] Short-Term Debt, Type [Axis] SUPPLEMENTAL CASH FLOW INFORMATION Cash Flow, Supplemental Disclosures [Text Block] Income taxes Income Tax, Policy [Policy Text Block] 2026 Finite-Lived Intangible Asset, Expected Amortization, Year Three Insider Trading Arrangements [Line Items] Pre-tax gain on sale of real estate Gains (Losses) on Sales of Other Real Estate Shares Issued - Stock-based compensation Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Accounting Changes and Error Corrections [Abstract] Debt conversion terms four Debt Conversion Terms Four [Member] Debt Conversion Terms Four Entity registrant name Entity Registrant Name Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Award Timing Method Award Timing Method [Text Block] 2025 Finite-Lived Intangible Asset, Expected Amortization, Year Two Adjustment to Compensation, Amount Adjustment to Compensation Amount Other current liabilities Increase (Decrease) in Other Current Liabilities Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Property, plant, and equipment, accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Schedule of fair value of assets and liabilities measured on a recurring basis categorized by level within the fair value hierarchy Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Corporate and Other Corporate and Other [Member] Retirement of long-term debt Repayments of Long-Term Debt External revenues External Revenues [Member] External revenues represents transactions with external parties. Entity central index key Entity Central Index Key Gains (losses) Derivative, Gain (Loss) on Derivative, Net Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Gross carrying amount Finite-Lived Intangible Assets, Gross Coal Combustion Residuals Rule Coal Combustion Residuals Rule [Member] The Coal Combustion Residuals Rules enacted by the United States Environmental Protection Agency in April 2024 applies to landfills, historical fill sites, and projects where coal combustion residuals were placed at a power plant site. This rule regulates previously exempt closed landfills and expands the remediation currently required under state programs. Energy costs refundable through rate adjustments Energy Costs Refundable Through Rate Adjustments [Member] Rate action of a regulator resulting in capitalization or accrual of the over-collection of energy costs that will be refunded to customers in the future. Asset Acquisition [Abstract] Columbia Energy Center Columbia Energy Center Units 1 and 2 [Member] Represents Columbia Energy Center Units 1 and 2, jointly owned utility facilities of the entity located in Portage, Wisconsin. Name Trading Arrangement, Individual Name Natural gas contracts Commodity Contract Natural Gas [Member] Derivative instrument whose primary underlying risk is tied to the commodity price of natural gas. Operating revenues disaggregated by revenue source Disaggregation of Revenue [Table Text Block] Accretion Asset Retirement Obligation, Accretion Expense Other current liabilities Regulatory Liability, Current Interim rate increase Public Utilities, Interim Rate Increase (Decrease), Amount Revenues from contracts with customers Revenue from Contract with Customer, Excluding Assessed Tax Entity [Domain] Entity [Domain] Requested rate increase (as a percent) Public Utilities, Requested Rate Increase (Decrease), Percentage REGULATORY ASSETS AND LIABILITIES Schedule of Regulatory Assets and Liabilities [Text Block] Amendment flag Amendment Flag Realized gains and losses Derivative, Gain (Loss) on Derivative, Net [Abstract] Legal Entity [Axis] Legal Entity [Axis] Senior Notes Senior Notes Cash paid for interest, net of amount capitalized Interest Paid, Excluding Capitalized Interest, Operating Activities Long-term debt (June 30, 2024 and December 31, 2023 include $80.9 and $85.3, respectively, related to WEPCo Environmental Trust) Long-term debt Long-Term Debt, Excluding Current Maturities Company goal for percentage of carbon emissions reduction below 2005 levels by the end of 2025 Percent Carbon Dioxide Emission Reduction Goal by the end of 2025 The percentage by which the company plans to reduce carbon dioxide emissions below by the end of 2025 Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Derivative assets Derivative Asset [Abstract] Capacity of generation unit Capacity Of Generation Unit The capacity, in megawatts, of a generation unit. Operating expenses Operating Expenses [Abstract] Offsetting derivative assets Offsetting Derivative Assets [Abstract] Capital expenditures Payments to Acquire Property, Plant, and Equipment Company Selected Measure Amount Company Selected Measure Amount Total assets Total assets Assets Name Awards Close in Time to MNPI Disclosures, Individual Name Percent of net accounts receivable with regulatory protections Percent of net accounts receivable with regulatory protections Percent of net accounts receivable and unbilled revenues with regulatory protections in place to mitigate the exposure to credit losses Derivative liabilities Derivative liabilities Gross amount recognized on the balance sheet Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement West Riverside Energy Center West Riverside Energy Center [Member] West Riverside Energy Center Thereafter Finance Lease, Liability, to be Paid, after Year Five Non-NEOs Non-NEOs [Member] Pension Benefits Pension Plan [Member] Notional sales volumes Notional Disclosures [Abstract] NSG NSG [Member] North Shore Gas Company Schedule of rate requests Public Utilities General Disclosures [Table Text Block] Financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Non-PEO NEO Non-PEO NEO [Member] Adjustment to Compensation: Adjustment to Compensation [Axis] Floating Rate WEC Energy Group Junior Notes Due 2067 Floating Rate WEC Energy Group Junior Notes Due 2067 [Member] WEC Energy Group's floating interest rate unsecured junior subordinated notes due May 15, 2067. Natural gas in storage Energy Related Inventory, Natural Gas in Storage Types of Non-Utility Operating Revenues [Axis] Types of Non-Utility Operating Revenues [Axis] Disaggregates non-utility operating revenues. Wisconsin WisconsinSegment [Member] The Wisconsin segment includes the electric and natural gas utility operations of Wisconsin Electric Power Company, Wisconsin Public Service Corporation, Wisconsin Gas LLC, and Upper Michigan Energy Resources Corporation. Large commercial and industrial Large commercial and industrial customers [Member] Represents customers of a sector of the economy consisting of companies engaged in large commercial and industrial activities Debt Instrument [Line Items] Debt Instrument [Line Items] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Unamortized debt issuance costs Unamortized Debt Issuance Expense Schedule of Short-term Debt [Table] Schedule of Short-Term Debt [Table] Deferred tax liabilities Deferred Tax Liabilities, Property, Plant and Equipment Schedule of Indefinite-Lived Intangible Liabilities [Table] Schedule of Indefinite-Lived Intangible Assets [Table] Statement of Other Comprehensive Income [Abstract] Statement of Other Comprehensive Income [Abstract] Amortization to be recorded in the next five years Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Product information [Line Items] Product Information [Line Items] Refund period Refund period Period of time over which refunds are made Regulatory assets (June 30, 2024 and December 31, 2023 include $82.3 and $85.9, respectively, related to WEPCo Environmental Trust) Regulatory assets Regulatory Asset, Noncurrent Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Condensed consolidated financial statements Statement [Line Items] Materials, supplies, and inventories Total Energy Related Inventory 2025 Rates 2025 Rates [Member] 2025 rate case impacts 5.00% WE Debentures due 05/15/2029 5.00% WE Debentures due 05/15/2029 [Member] 5.00% WE Debentures due 05/15/2029 Common shareholders' equity Total Common Shareholders' Equity Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. Noncontrolling interests Noncontrolling Interest [Member]