Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule Of Derivative Instruments In Statement Of Financial Position, Fair Value
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
Schedule Of Derivative Gains (Losses) Recognized In Accumulated Other Comprehensive Income
Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block]
Schedule Of Derivatives Not Designated As Hedging Instruments Statements Of Financial Performance Location Table
Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]
Earnings Per Share [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Antidilutive Incremental Common Shares Excluded and Attributable to Share-based Payment Arrangements
Antidilutive Incremental Common Shares Excluded and Attributable to Share-based Payment Arrangements
Antidilutive Incremental Common Shares Excluded and Attributable to Share-based Payment Arrangements
DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES
Derivative Instruments and Hedging Activities Disclosure [Text Block]
Income Statement [Abstract]
REVENUES FROM PRODUCT SALES AND SERVICES
Revenues [Abstract]
Product
Sales Revenue, Goods, Net
Freight and venture partners' cost reimbursements
Reimbursement Revenue And Freight Revenue
Repayment received for expenses incurred on behalf of the client or customer and revenue from transporting freight between locations.
TOTAL REVENUES
Revenues
COST OF GOODS SOLD AND OPERATING EXPENSES
Cost of Goods and Services Sold
SALES MARGIN
Gross Profit
OTHER OPERATING INCOME (EXPENSE)
Operating Expenses [Abstract]
Selling, general and administrative expenses
Selling, General and Administrative Expense
Exploration costs
Exploration Expense, Mining
Miscellaneous - net
Other Operating Income (Expense), Net
Other operating expense
Operating Expenses
OPERATING INCOME (EXPENSE)
Operating Income (Loss)
OTHER INCOME (EXPENSE)
Nonoperating Income (Expense) [Abstract]
Interest expense, net
Interest Income (Expense), Net
Other non-operating income
Other Nonoperating Income (Expense)
TOTAL OTHER EXPENSE
Nonoperating Income (Expense)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES AND EQUITY LOSS FROM VENTURES
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest
INCOME TAX BENEFIT (EXPENSE)
Income Tax Expense (Benefit)
EQUITY LOSS FROM VENTURES, net of tax
Income (Loss) from Equity Method Investments
NET INCOME (LOSS)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
LOSS (INCOME) ATTRIBUTABLE TO NONCONTROLLING INTEREST
Net Income (Loss) Attributable to Noncontrolling Interest
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS
Net Income (Loss) Attributable to Parent
PREFERRED STOCK DIVIDENDS
Dividends, Preferred Stock
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS COMMON SHAREHOLDERS
Net Income (Loss) Available to Common Stockholders, Basic
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Basic:
Earnings Per Share, Basic
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Diluted:
Earnings Per Share, Diluted
AVERAGE NUMBER OF SHARES (IN THOUSANDS)
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Basic
Weighted Average Number of Shares Outstanding, Basic
Diluted
Weighted Average Number of Shares Outstanding, Diluted
CASH DIVIDENDS DECLARED PER DEPOSITARY SHARE
Depositary Shares, Dividends, Per Share, Declared
Depositary Shares, Dividends, Per Share, Declared
CASH DIVIDENDS DECLARED PER COMMON SHARE
Common Stock, Dividends, Per Share, Declared
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill [Table]
Schedule of Goodwill [Table]
Statements of Consolidated Operations Location [Axis]
Income Statement Location [Axis]
Statements of Consolidated Operations Location [Domain]
Income Statement Location [Domain]
Cost of Sales [Member]
Cost of Sales [Member]
Product Revenues [Member]
Sales Revenue, Goods, Net [Member]
Below Market Sales Contracts [Axis]
Below Market Sales Contracts [Axis]
Below Market Sales Contracts
Below Market Sales Contracts [Domain]
Below Market Sales Contracts [Domain]
Below Market Sales Contracts [Domain]
Sales Revenue, Goods, Net [Member]
Goodwill [Line Items]
Goodwill [Line Items]
Amortization expense relating to intangible assets
Amortization of Intangible Assets
Below Market Sales Contract, Remaining Life
Below Market Sales Contract, Remaining Life
Below Market Sales Contract, Remaining Life
Supplemental Cash Flow Information [Abstract]
Supplemental Cash Flow Disclosures
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment [Table]
Schedule of Segment Reporting Information, by Segment [Table]
Segments [Axis]
Segments [Axis]
Segment [Domain]
Segments [Domain]
Total Segment Assets [Member]
Operating Segments [Member]
U.S. Iron Ore [Member]
U S Iron Ore [Member]
U.S. Iron Ore [Member]
Eastern Canadian Iron Ore [Member]
Eastern Canadian Iron Ore [Member]
Eastern Canadian Iron Ore [Member]
Asia Pacific Iron Ore [Member]
Asia Pacific Iron Ore [Member]
Asia Pacific Iron Ore [Member]
North American Coal [Member]
North American Coal [Member]
North American Coal [Member]
All Other Segments [Member]
Other Segments [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information [Line Items]
Revenues from producet sales and services, percent
Percentage Of Segment Revenue
Percentage of Segment Revenue
Revenues from product sales and services
Sales Margin
Other expense
Income from Continuing Operations before income taxes and equity (loss) from ventures
Depreciation, depletion and amortization
Depreciation, Depletion and Amortization
Capital Additions
Property, Plant and Equipment, Additions
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments [Table]
Schedule of Long-term Debt Instruments [Table]
Debt Instrument [Axis]
Debt Instrument [Axis]
Debt Instrument, Name [Domain]
Debt Instrument, Name [Domain]
Seven Hundred Million Four Point Eight Seven Five Two Thousand Twenty-one Senior Note [Member]
Seven Hundred Million Four Point Eight Seven Five Two Thousand Twenty-one Senior Note [Member]
Seven Hundred Million Four Point Eight Seven Five Two Thousand Twenty-one Senior Note [Member]
$500 million 4.80% 2020 Senior Notes [Member]
Five Hundred Million Four Point Eight Zero Percent Senior Note [Member]
Five Hundred Million Four Point Eight Zero Percent Senior Note [Member]
$800 Million 6.25% 2040 Senior Notes [Member]
Eight Hundred Million Six Point Two Five Percent Senior Notes Due Two Thousand Forty [Member]
Eight Hundred Million Six Point Two Five Percent Senior Notes Due Two Thousand Forty [Member]
$400 Million 5.90% 2020 Senior Notes [Member]
Four Hundred Million Five Point Nine Zero Two Thousand And Twenty Senior Note [Member]
Four Hundred Million Five Point Nine Zero Two Thousand And Twenty Senior Note [Member]
$500 Million 3.95% 2018 Senior Notes [Member]
Five Hundred Million Three Point Nine Five Two Thousand Eighteen Senior Note [Member]
Five Hundred Million Three Point Nine Five Two Thousand Eighteen Senior Note [Member]
Revolving Credit Facility [Member]
Revolving Credit Facility [Member]
Equipment Loans [Member]
Equipment Loans [Member]
Equipment Loans [Member]
Short-term Debt [Member]
Short-term Debt [Member]
Interest Rate Swap [Member]
Interest Rate Swap [Member]
Debt Instrument [Line Items]
Debt Instrument [Line Items]
Stated interest rate
Debt Instrument, Interest Rate, Stated Percentage
Type
Debt Instrument, Interest Rate Terms
Final Maturity
Debt Instrument Year Of Maturity
Debt Instrument Year of Maturity
Total Face Amount
Debt Instrument, Face Amount
Credit facility, amount outstanding
Line of Credit Facility, Amount Outstanding
Letters of credit outstanding
Letters of Credit Outstanding, Amount
Long-term Debt
Long-term Debt
Fair Value Adjustment to Interest Rate Hedge
Fair Value Adjustment to Interest Rate Hedge
Fair Value Adjustment to Interest Rate Hedge
Current portion of long-term debt
Long-term Debt, Current Maturities
Long-term debt noncurrent portion
Long-term Debt, Excluding Current Maturities
Debt Instrument, Unamortized Discount
Debt Instrument, Unamortized Discount
Imputed interest rate
Debt Instrument, Interest Rate, Effective Percentage
Credit facility remaining capacity
Line of Credit Facility, Remaining Borrowing Capacity
Related Party Transactions [Abstract]
Product revenues from related parties
Revenue from Related Parties
Related party product revenue as a percent of total product revenue
Percentage Of Related Party Revenue
Related party product revenue as a percentage of total product revenue.
Schedule Of Segment Reporting Information, By Segment
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Summary of Assets by Segment
Reconciliation of Assets from Segment to Consolidated [Table Text Block]
Leases [Abstract]
Schedule Of Future Minimum Lease Payments For Capital Leases And Operating Leases
Schedule Of Future Minimum Lease Payments For Capital Leases And Operating Leases Table [Text Block]
Tabular disclosure of future minimum lease payments as of the date of the latest balance sheet presented, in aggregate and for each of the five years succeeding fiscal years, with separate deductions from the total for the amount representing executor costs, including any profit thereon, included in the minimum lease payments and for the amount of the imputed interest necessary to reduce the net minimum lease payments to present value.
Schedule of Related Party Transactions, by Related Party [Table]
Schedule of Related Party Transactions, by Related Party [Table]
Balance Sheet Location [Axis]
Balance Sheet Location [Axis]
Balance Sheet Location [Domain]
Balance Sheet Location [Domain]
Other Noncurrent Assets [Member]
Other Noncurrent Assets [Member]
Name of Operation [Axis]
Name of Operation [Axis]
Name of Operation [Axis]
Name of Operation [Domain]
Name of Operation [Domain]
[Domain] for Name of Operation [Axis]
Empire [Member]
Empire [Member]
Empire [Member]
Tilden [Member]
Tilden [Member]
Tilden [Member]
Hibbing [Member]
Hibbing [Member]
Hibbing [Member]
Bloom Lake [Member]
Bloom Lake [Member]
Bloom Lake [Member]
Equity Method Investee, Name [Axis]
Investment, Name [Axis]
Equity Method Investee, Name [Domain]
Investment, Name [Domain]
Arcelor Mittal [Member]
Arcelor Mittal [Member]
Arcelor Mittal [Member]
Related Party [Axis]
Related Party [Axis]
Related Party [Domain]
Related Party [Domain]
U. S. Steel Canada [Member]
U. S. Steel Canada [Member]
U. S. Steel Canada
WISCO [Member]
Wisco [Member]
WISCO [Member]
Related Party Transaction [Line Items]
Related Party Transaction [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent
Noncontrolling Interest, Ownership Percentage by Parent
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners
Ownership interest, equity method investment
Equity Method Investment, Ownership Percentage
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule Of Share-Based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Type of Deferred Compensation [Axis]
Type of Deferred Compensation [Axis]
Type of Deferred Compensation, All Types [Domain]
Type of Deferred Compensation, All Types [Domain]
Two Thousand And Twelve To Two Thousand And Fourteen And The Two Thousand And Thirteen To Two Thousand Fifteen and Two Thousand Fourteen to Two Thousand Sixteen Performance Periods [Member]
Two Thousand And Twelve To Two Thousand And Fourteen And The Two Thousand And Thirteen To Two Thousand Fifteen and Two Thousand Fourteen to Two Thousand Sixteen Performance Periods [Member]
Two Thousand And Twelve To Two Thousand And Fourteen And The Two Thousand And Thirteen To Two Thousand Fifteen and Two Thousand Fourteen to Two Thousand Sixteen Performance Periods [Member]
Plan Name [Axis]
Plan Name [Axis]
Plan Name [Domain]
Plan Name [Domain]
ICE Plan and 2012 Equity Plan [Member]
Ice Plan and Two Thousand Twelve Equity Plan [Member]
Ice Plan and Two Thousand Twelve Equity Plan [Member]
2012 Equity Plan [Member]
Two Thousand Twelve Equity Plan [Member]
Two Thousand Twelve Equity Plan [Member]
Range [Axis]
Range [Axis]
Range [Domain]
Range [Domain]
Minimum [Member]
Minimum [Member]
Maximum [Member]
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Plan Year Agreements
Share-based Compensation Arrangement by Share-based Payment Award, Number of Plan Year Agreements
Share-based Compensation Arrangement by Share-based Payment Award, Number of Plan Year Agreements
Performance/vesting period
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period
Payout rate, as a percentage of the original grant
Share Based Goods And Nonemployee Services Transaction Valuation Method Payout Rate
Share Based Goods and Nonemployee Services Transaction Valuation Method, Payout Rate
Number of performance shares granted
Stock Issued During Period Share Performance Stock Award Gross
Stock Issued During Period Share Performance Stock Award Gross
Number of restricted shares granted
Stock Issued During Period, Shares, Restricted Stock Award, Gross
Maximum number of shares that may be issued (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized
Number of Additional Shares Available for Issuance Proposed to be Added to the Plan
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Available for Issuance Proposed to be added to the Plan
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Available for Issuance Proposed to be added to the Plan
Environmental Remediation Obligations [Abstract]
Loss Contingencies [Table]
Loss Contingencies [Table]
Mine Closure [Axis]
Mine Closure [Axis]
Mine Closure [Axis]
Mine Closure [Domain]
Mine Closure [Domain]
[Domain] for Mine Closure [Axis]
LTV Steel Mining Company [Member]
L T V Steel Mining Company [Member]
LTV Steel Mining Company
Loss Contingency Nature [Axis]
Loss Contingency Nature [Axis]
Loss Contingency, Nature [Domain]
Loss Contingency, Nature [Domain]
Previously Owned Or Operating Facilities [Member]
Previously Owned Or Operating Facilities [Member]
Previously Owned Or Operating Facilities [Member]
Owned Or Operating Facilities [Member]
Owned Or Operating Facilities [Member]
Owned Or Operating Facilities [Member]
Loss Contingencies [Line Items]
Loss Contingencies [Line Items]
Environmental
Accrual for Environmental Loss Contingencies
Mine Reclamation and Closing Liability, current and noncurrent
Mine Reclamation and Closing Liability, current and noncurrent
Mine Reclamation and Closing Liability, current and noncurrent
Total environmental and mine closure obligations
Environmental Loss Contingency And Mine Reclamation And Closing Liability Current And Noncurrent
Environmental Loss Contingency And Mine Reclamation And Closing Liability Current And Noncurrent
Less current portion
Environmental Loss Contingency And Mine Reclamation And Closing Liability Current
Environmental Loss Contingency And Mine Reclamation And Closing Liability Current
Long term environmental and mine closure obligations
Environmental Loss Contingency And Mine Reclamation And Closing Liability Noncurrent
Amount of environmental loss contingencies, such as presence of hazardous waste, relevant information from reports issued by regulators, and estimated costs to achieve compliance with regulatory requirements. As well as, the amount of a reclamation and mine closing liability that is associated with a legal obligation for the closure and reclamation of a mine including the removal of buildings, equipment, machinery and other physical remnants of mining, closure of tailings impoundments, leach pads and other mine features, and contouring, covering and revegetation of waste rock piles and other disturbed areas.
Schedule of Finite-Lived Intangible Assets [Table]
Schedule of Finite-Lived Intangible Assets [Table]
Finite-Lived Intangible Assets by Major Class [Axis]
Finite-Lived Intangible Assets by Major Class [Axis]
Finite-Lived Intangible Assets, Major Class Name [Domain]
Finite-Lived Intangible Assets, Major Class Name [Domain]
Permits [Member]
Use Rights [Member]
Utility Contracts [Member]
Utility Contracts [Member]
Utility Contracts [Member]
Leases [Member]
Lease Agreements [Member]
Below Market Sales Contracts [Member]
Below Market Sales Contracts [Member]
Below Market Sales Contracts [Member]
Intangible Assets, Net [Member]
Intangible Assets, Net [Member]
Intangible Assets, Net [Member]
Other Current Liabilities [Member]
Other Current Liabilities [Member]
Other Liabilities [Member]
Other Liabilities [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets [Line Items]
Definite lived intangible assets - Gross Carrying Amount
Finite-Lived Intangible Assets, Gross
Definite lived intangible assets - Accumulated Amortization
Finite-Lived Intangible Assets, Accumulated Amortization
Definite lived intangible assets - Net Carrying Amount
Finite-Lived Intangible Assets, Net
Postemployment Benefits [Abstract]
PENSIONS AND OTHER POSTRETIREMENT BENEFITS
Pension and Other Postretirement Benefits Disclosure [Text Block]
Changes in Accumulated Othe Comprehensive Income [Abstract]
Changes in Accumulated Othe Comprehensive Income [Abstract]
Schedule of Stockholders Equity [Table Text Block]
Schedule of Stockholders Equity [Table Text Block]
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Details of Accumulated Other Comprehensive Income (Loss) Components [Table Text Block]
Details of Accumulated Other Comprehensive Income (Loss) Components [Table Text Block]
[Table Text Block] for Details of Accumulated Other Comprehensive Income (Loss) Components [Table]
Subsequent Events [Abstract]
SUBSEQUENT EVENTS
Subsequent Events [Text Block]
Summary Of Other Ownership Interests
Other Ownership Interests Table [Text Block]
Summary of other ownership interests in the Company's mines
Summary Of Related Party Transactions Table Disclosure
Schedule of Related Party Transactions [Table Text Block]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Northshore [Member]
Northshore [Member]
Northshore [Member]
United Taconite [Member]
United Taconite [Member]
United Taconite [Member]
Wabush [Member]
Wabush [Member]
Wabush [Member]
Koolyanobbing [Member]
Koolyanobbing [Member]
Koolyanobbing [Member]
Pinnacle [Member]
Pinnacle [Member]
Pinnacle [Member]
Oak Grove [Member]
Oak Grove [Member]
Oak Grove [Member]
CLCC [Member]
CLCC [Member]
CLCC [Member]
Entity Address, State or Province
Entity Address, State or Province
Segment Reporting Information, Description of Products and Services
Segment Reporting Information, Description of Products and Services
Basis Of Presentation And Significant Accounting Policies [Table]
Basis Of Presentation And Significant Accounting Policies [Table]
Basis Of Presentation And Significant Accounting Policies [Table]
Intercompany Foreign Currency Balance by Description [Axis]
Intercompany Foreign Currency Balance by Description [Axis]
Intercompany Foreign Currency Balance, Name [Domain]
Intercompany Foreign Currency Balance, Name [Domain]
Transaction Gains and Losses Resulting from Remeasurement [Member]
Transaction Gains and Losses Resulting from Remeasurement [Member]
Transaction Gains and Losses Resulting from Remeasurement [Member]
Short-term intercompany loan [Member]
Short-term intercompany loan [Member]
Short-term intercompany loan [Member]
Cash and Cash Equivalents [Member]
Cash and Cash Equivalents [Member]
Black Label And Black Thor Chromite Deposits [Member]
Black Label And Black Thor Chromite Deposits [Member]
Black Label And Black Thor Chromite Deposits [Member]
Big Daddy Chromite Deposit [Member]
Big Daddy Chromite Deposit [Member]
Big Daddy Chromite Deposit [Member]
Reporting unit [Axis]
Reporting unit [Axis]
Reporting unit
Reporting unit [Domain]
Reporting unit [Domain]
[Domain] for Reporting unit
Foreign Currency Transaction Gain (Loss), before Tax
Foreign Currency Transaction Gain (Loss), before Tax
Current Fiscal Year End Date
Current Fiscal Year End Date
Ownership Interest
Percentage Of Ownership Interests
The percentage of ownership of common stock or equity participation in the investee.
Cash Flow Information
Cash Flow, Supplemental Disclosures [Text Block]
Shareholders' Equity [Abstract]
Shareholders' Equity [Abstract]
Statement [Table]
Statement [Table]
Statement [Line Items]
Statement [Line Items]
Property, Plant and Equipment [Abstract]
Schedule of Property, Plant and Equipment [Table]
Property, Plant and Equipment [Table]
Property, Plant and Equipment, Type [Axis]
Property, Plant and Equipment, Type [Axis]
Property, Plant and Equipment, Type [Domain]
Property, Plant and Equipment, Type [Domain]
Land Rights And Mineral Rights [Member]
Mining Properties and Mineral Rights [Member]
Office And Information Technology [Member]
Computer Equipment [Member]
Buildings [Member]
Building [Member]
Mining Equipment [Member]
Equipment [Member]
Processing Equipment [Member]
Other Machinery and Equipment [Member]
Electric Power Facilities [Member]
Electric Generation Equipment [Member]
Port Facilities [Member]
Maritime Equipment [Member]
Interest Capitalized During Construction [Member]
Capitalized Interest Charges [Member]
Interest charges incurred on debt that directly or indirectly provided funds to finance the construction of assets that qualified for interest capitalization.
Land Improvements [Member]
Land Improvements [Member]
Other [Member]
Other Assets [Member]
Construction in Progress [Member]
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross
Property, Plant and Equipment, Gross
Allowance for depreciation and depletion
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment
Property, plant and equipment, net
Property, Plant and Equipment, Net
Commitments and Contingencies Disclosure [Abstract]
Litigation Status [Axis]
Litigation Status [Axis]
Litigation Status [Domain]
Litigation Status [Domain]
Litigation Case [Axis]
Litigation Case [Axis]
Litigation Case [Domain]
Litigation Case [Domain]
Worldlink Arbitration [Member]
Worldlink Arbitration [Member]
Worldlink Arbitration [Member]
Worldlink Counterclaim [Member]
Worldlink Counterclaim [Member]
Worldlink Counterclaim [Member]
Loss Contingency, Damages Sought, Value
Loss Contingency, Damages Sought, Value
BUSINESS SUMMARY AND SIGNIFICANT ACCOUNTING POLICIES
Basis of Presentation and Significant Accounting Policies [Text Block]
Schedule of Operating and Capital Leased Assets [Table]
Schedule of Operating and Capital Leased Assets [Table]
Schedule of Operating and Capital Leased Assets table
Operating and Capital Leased Assets [Line Items]
Operating and Capital Leased Assets [Line Items]
[Line Items] for Schedule of Operating and Capital Leased Assets [Table] [Table]
Capital Leases
Leases, Capital [Abstract]
2014 (April 1 - December 31)
Capital Leases, Future Minimum Payments, Remainder of Fiscal year
2015
Capital Leases, Future Minimum Payments Due, Next Twelve Months
2016
Capital Leases, Future Minimum Payments Due in Two Years
2017
Capital Leases, Future Minimum Payments Due in Three Years
2018
Capital Leases, Future Minimum Payments Due in Four Years
2019 and thereafter
Capital Leases, Future Minimum Payments Due Thereafter
Total minimum lease payments
Capital Leases, Future Minimum Payments Due
Amounts representing interest
Capital Leases, Future Minimum Payments, Interest Included in Payments
Present value of net minimum lease payments
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments
Operating Leases
Leases, Operating [Abstract]
2014 (April 1 - December 31)
Operating Leases, Future Minimum Payments, Remainder of Fiscal Year
2015
Operating Leases, Future Minimum Payments Due, Next Twelve Months
2016
Operating Leases, Future Minimum Payments, Due in Two Years
2017
Operating Leases, Future Minimum Payments, Due in Three Years
2018
Operating Leases, Future Minimum Payments, Due in Four Years
2019 and thereafter
Operating Leases, Future Minimum Payments, Due Thereafter
Total minimum lease payments
Operating Leases, Future Minimum Payments Due
Value Of Each Of The Major Classes Of Consolidated Depreciable Assets
Property, Plant and Equipment [Table Text Block]
Statement of Cash Flows [Abstract]
Cash and Cash Equivalents, Period Increase (Decrease) [Abstract]
Cash and Cash Equivalents, Period Increase (Decrease) [Abstract]
OPERATING ACTIVITIES
Net Cash Provided by (Used in) Operating Activities [Abstract]
Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities:
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Realized and Unrealized Gains (Losses) Derivatives and Currency Hedges
Realized and Unrealized Gains (Losses) Derivatives and Currency Hedges
Realized and Unrealized Gains (Losses) Derivatives and Currency Hedges
Deferred income taxes
Deferred Income Tax Expense (Benefit)
Changes in deferred revenue and below-market sales contracts
Increase (Decrease) In Deferred Revenue And Below Market Sales Contracts
Increase (Decrease) in Deferred Revenue, carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and Below Market Sales Contracts, sales contracts obtained through the purchase of a subsidiary, which are below market value at acquisition.
Other
Other Noncash Income (Expense)
Changes in operating assets and liabilities:
Increase (Decrease) in Operating Capital [Abstract]
Receivables and other assets
Increase (Decrease) in Accounts Receivable and Other Operating Assets
Product inventories
Increase (Decrease) in Inventories
Payables and accrued expenses
Increase (Decrease) in Accounts Payable and Accrued Liabilities
Net cash provided (used) by operating activities
Net Cash Provided by (Used in) Operating Activities
INVESTING ACTIVITIES
Net Cash Provided by (Used in) Investing Activities [Abstract]
Purchase of property, plant and equipment
Payments to Acquire Property, Plant, and Equipment
Other investing activities
Payments for (Proceeds from) Other Investing Activities
Net cash used by investing activities
Net Cash Provided by (Used in) Investing Activities
FINANCING ACTIVITIES
Net Cash Provided by (Used in) Financing Activities [Abstract]
Net proceeds from issuance of Series A, Mandatory Convertible Preferred Stock, Class A
Proceeds from Issuance of Convertible Preferred Stock
Net proceeds from issuance of common shares
Proceeds from Issuance of Common Stock
Repayment of term loan
Repayments of Other Long-term Debt
Borrowings under credit facilities
Proceeds from Long-term Lines of Credit
Repayment under credit facilities
Repayments of Long-term Lines of Credit
Common stock dividends
Payments of Ordinary Dividends, Common Stock
Preferred stock dividends
Payments of Ordinary Dividends, Preferred Stock and Preference Stock
Other financing activities
Proceeds from (Payments for) Other Financing Activities
Net cash provided by financing activities
Net Cash Provided by (Used in) Financing Activities
EFFECT OF EXCHANGE RATE CHANGES ON CASH
Effect of Exchange Rate on Cash and Cash Equivalents
INCREASE IN CASH AND CASH EQUIVALENTS
Cash and Cash Equivalents, Period Increase (Decrease)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD
Cash And Cash Equivalents, At Carrying Value, Including Assets Held For Sale
Cash And Cash Equivalents, At Carrying Value, Including Assets Held For Sale
CASH AND CASH EQUIVALENTS AT END OF PERIOD
Basis Of Consolidation
Consolidation, Subsidiaries or Other Investments, Consolidated Entities, Policy [Policy Text Block]
Equity Method Investments
Equity Method Investments, Policy [Policy Text Block]
Foreign Currency Transactions and Translations Policy [Policy Text Block]
Foreign Currency Transactions and Translations Policy [Policy Text Block]
New Accounting Pronouncements, Policy [Policy Text Block]
New Accounting Pronouncements, Policy [Policy Text Block]
SEGMENT REPORTING
Segment Reporting Disclosure [Text Block]
Fair Value Disclosures [Abstract]
Fair Value, by Balance Sheet Grouping [Table]
Fair Value, by Balance Sheet Grouping [Table]
Fair Value, Hierarchy [Axis]
Fair Value, Hierarchy [Axis]
Fair Value, Measurements, Fair Value Hierarchy [Domain]
Fair Value Hierarchy [Domain]
Fair Value, Inputs, Level 1 [Member]
Fair Value, Inputs, Level 1 [Member]
Fair Value, Inputs, Level 2 [Member]
Fair Value, Inputs, Level 2 [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets:
Assets, Fair Value Disclosure [Abstract]
Cash equivalents
Cash and Cash Equivalents, Fair Value Disclosure
Derivative assets
Derivative Asset
Marketable Securities
Investments, Fair Value Disclosure
Foreign exchange contracts
Foreign Currency Contract, Asset, Fair Value Disclosure
Total
Assets, Fair Value Disclosure
Liabilities:
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities
Derivative Liability
Foreign exchange contracts
Foreign Currency Contracts, Liability, Fair Value Disclosure
Total
Financial and Nonfinancial Liabilities, Fair Value Disclosure
SHAREHOLDERS' EQUITY
Stockholders' Equity Note Disclosure [Text Block]
Schedule of Net Benefit Costs [Table Text Block]
Schedule of Net Benefit Costs [Table Text Block]
Derivative Instruments [Table]
Derivative [Table]
Derivative Instrument Risk [Axis]
Derivative Instrument [Axis]
Derivative Contract Type [Domain]
Derivative Contract [Domain]
Canadian Dollar Foreign Exchange Contracts Hedge Prior to De Designation [Member]
Canadian Dollar Foreign Exchange Contracts Hedge Prior to De Designation [Member]
Canadian Dollar Foreign Exchange Contracts Hedge Prior to De Designation [Member]
Australian Dollar Foreign Exchange Contract Hedge Designation [Member]
Australian Dollar Foreign Exchange Contract Hedge Designation [Member]
Australian Dollar Foreign Exchange Contract (Hedge Designation) [Member]
Canadian Dollar Foreign Exchange Contracts Hedge Designation [Member]
Canadian Dollar Foreign Exchange Contracts Hedge Designation [Member]
Canadian Dollar Foreign Exchange Contracts Hedge Designation [Member]
Canadian Dollar Foreign Exchange Contracts Hedge De Designated [Member] [Member]
Canadian Dollar Foreign Exchange Contracts Hedge De Designated [Member] [Member]
Canadian Dollar Foreign Exchange Contracts Hedge De Designated [Member]
Foreign Exchange Contract [Member]
Foreign Exchange Contract [Member]
Customer Supply Agreement [Member]
Customer Supply Agreement [Member]
Customer Supply Agreement [Member]
Provisional Pricing Arrangements [Member]
Provisional Pricing Arrangements [Member]
Provisional Pricing Arrangements [Member]
Hedging Designation [Axis]
Hedging Designation [Axis]
Hedging Designation [Domain]
Hedging Designation [Domain]
Designated as Hedging Instrument [Member]
Designated as Hedging Instrument [Member]
Not Designated as Hedging Instrument [Member]
Not Designated as Hedging Instrument [Member]
U.S. Iron Ore, Eastern Canadian Iron Ore And Asia Pacific Iron Ore [Member]
U S Iron Ore Eastern Canadian Iron Ore And Asia Pacific Iron Ore [Member]
U.S. Iron Ore, Eastern Canadian Iron Ore And Asia Pacific Iron Ore [Member]
U S Iron Ore And Asia Pacific Iron Ore [Member]
U S Iron Ore And Asia Pacific Iron Ore [Member]
U S Iron Ore And Asia Pacific Iron Ore [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Derivative Financial Instruments, Assets [Member]
Derivative Financial Instruments, Assets [Member]
Derivative Financial Instruments, Liabilities [Member]
Derivative Financial Instruments, Liabilities [Member]
Statements of Consolidated Operations Location [Domain]
Other Nonoperating Income Expense [Member]
Other Nonoperating Income Expense [Member]
Other Nonoperating Income Expense [Member]
Derivative [Line Items]
Derivative [Line Items]
Derivative, Notional Amount
Derivative, Notional Amount
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net
Amount that will be reclassified to product revenues in the next 12 months upon settlement of the related contracts
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months
Amount of gain/(loss) recognized in income on derivative
Derivative, Gain (Loss) on Derivative, Net
Derivative assets
Derivative Asset, Current
Derivative liabilities
Derivative Liability, Current
Fair Value Of Assets And Liabilities
Fair Value, by Balance Sheet Grouping [Table Text Block]
Fair Value, Recurring and Nonrecurring, Valuation Techniques
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table Text Block]
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
Schedule Of Carrying Value And Fair Value Of Financial Instruments
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]
Fair Value Measurements, Nonrecurring
Fair Value Measurements, Nonrecurring [Table Text Block]
Estimated recognition of product revenues, below-market sales contracts [Abstract]
Recognition of Product Revenue from Below-Market Sales Contracts [Abstract]
Recognition of Product Revenue from Below-Market Sales Contracts [Abstract]
2014 (remaining six months)
Future Below Market Sales Contracts Revenue Year One
Future Below Market Sales Contracts Revenue, Year One
2015
Future Below Market Sales Contracts Revenue Year Two
Future Below Market Sales Contracts Revenue, Year Two
2016
Future Below Market Sales Contracts Revenue Year Three
Future Below Market Sales Contracts Revenue, Year Three
2017
Future Below Market Sales Contracts Revenue Year Four
Future Below Market Sales Contracts Revenue, Year Four
Total
Future Below Market Sales Contracts Revenue Within Five Years
Future Below Market Sales Contracts Revenue, Within Five Years
Pensions And Other Postretirement Benefits [Abstract]
Pensions And Other Postretirement Benefits [Abstract]
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table]
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table]
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]
Defined Benefit Plans and Other Postretirement Benefit Plans [Domain]
Defined Benefit Plan and Other Postretirement Benefit Plan [Domain]
Pension Plans, Defined Benefit [Member]
Pension Plan, Defined Benefit [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Other Postretirement Benefit Plan, Defined Benefit [Member]
Definted Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Disclosure [Line Items]
Pension Contributions
Pension Contributions
Other Postretirement Benefit Expense
Other Postretirement Benefit Expense
STOCK COMPENSATION PLANS
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
Schedule Of Subsidiaries
Schedule Of Consolidation Subsidiaries Or Other Investments Consolidated Entities [Table Text Block]
Disclosure of subsidiaries or other investments that are consolidated.
Schedule of Equity Method Investments
Equity Method Investments [Table Text Block]
Corporate [Member]
Corporate Segment [Member]
Assets
Assets
DEBT AND CREDIT FACILITIES
Debt Disclosure [Text Block]
Other Segment [Member]
Other Segment [Member]
Other Segment [Member]
Goodwill [Roll Forward]
Goodwill [Roll Forward]
Beginning Balance
Goodwill
Arising in business combinations
Goodwill, Acquired During Period
Impairment
Goodwill, Impairment Loss
Impact of foreign currency translation
Goodwill, Translation and Purchase Accounting Adjustments
Ending Balance
Accumulated goodwill impairment loss
Goodwill, Impaired, Accumulated Impairment Loss
Debt and Credit Facilities [Abstract]
Debt and Credit Facilities [Abstract]
Line of Credit Facility [Table]
Line of Credit Facility [Table]
Short-term Debt, Type [Axis]
Short-term Debt, Type [Axis]
Credit Facility [Domain]
Short-term Debt, Type [Domain]
Accounts Receivable Securitization Facility [Member]
Accounts Receivable Securitization Facility [Member]
Accounts Receivable Securitization Facility [Member]
Pre-Export Trade Finance Loans [Member]
Pre-Export Trade Finance Loans [Member]
Pre-Export Trade Finance Loans [Member]
Line of Credit [Member]
Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility [Line Items]
Revolving credit facility, borrowing capacity
Line of Credit Facility, Maximum Borrowing Capacity
Financial covenant, debt to earnings ratio
Debt To Earnings Ratio
Debt To Earnings Ratio
Total Funded Debt to Total Capitalization
Total Funded Debt to Total Capitalization
Total Funded Debt to Total Capitalization
Financial covenant, interest coverage ratio
Coverage Ratio Of Earnings Before Interest Tax Depreciation And Amortization To Total Interest Expense
Coverage Ratio Of Earnings Before Interest Tax Depreciation And Amortization To Total Interest Expense
Maximum Impairment Permitted to be Excluded from Net Worth Calculation for Debt Covenants
Maximum Impairment Permitted to be Excluded from Net Worth Calculation for Debt Covenants
Maximum Non-Cash Impairment Permitted to be Excluded from Net Worth Calculation for Debt Covenants
Short-term Debt
Short-term Debt
Minimum Number of Days Loan Can be Drawn
Minimum Number of Days Loan Can be Drawn
Minimum Number of Days Loan Can be Drawn
Maximum Number of Days Loan can be Drawn
Maximum Number of Days Loan can be Drawn
Maximum Number of Days Loan can be Drawn
Compensation and Retirement Disclosure [Abstract]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Service Cost
Defined Benefit Plan, Service Cost
Defined Benefit Plan, Interest Cost
Defined Benefit Plan, Interest Cost
Defined Benefit Plan, Expected Return on Plan Assets
Defined Benefit Plan, Expected Return on Plan Assets
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)
Defined Benefit Plan, Amortization of Gains (Losses)
Defined Benefit Plan, Amortization of Gains (Losses)
Defined Benefit Plan, Curtailments
Defined Benefit Plan, Curtailments
Defined Benefit Plan, Net Periodic Benefit Cost
Defined Benefit Plan, Net Periodic Benefit Cost
RELATED PARTIES
Related Party Transactions Disclosure [Text Block]
Depreciation And Depletion
Depreciation And Depletion Expense
The aggregate expense recognized in the current period that allocates the cost of tangible assets or depleting assets to periods that benefit from use of the assets.
Accumulated amount of capitalized interest included within construction in progress
Accumulated Capitalized Interest Costs
Interest costs capitalized during the period
Interest Costs Capitalized
Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]
Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]
Valuation Technique [Axis]
Valuation Technique [Axis]
Valuation Technique [Domain]
Valuation Technique [Domain]
Market Approach Valuation Technique [Member]
Market Approach Valuation Technique [Member]
Derivatives, Fair Value [Line Items]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value
Derivative Asset, Fair Value, Gross Asset
Derivative liability, fair value
Derivative Liability, Fair Value, Gross Liability
Cash Paid for Capital Expenditures
Non-cash accruals
Capital Expenditures Incurred but Not yet Paid
Capital leases
Capital Lease Obligations Incurred
Total
Capital Expenditures Incurred But Not Yet Paid And Capital Lease Obligations Incurred
Future cash outflow to pay for purchases of fixed assets that have occurred and the increase during the period in capital lease obligations due to entering into new capital leases.
LEASE OBLIGATIONS
Leases of Lessee Disclosure [Text Block]
Schedule Of Long-Term Debt
Schedule of Long-term Debt Instruments [Table Text Block]
Schedule of Maturities of Long-term Debt [Table Text Block]
Schedule of Maturities of Long-term Debt [Table Text Block]
Summary Of Mine Closure Obligations
Schedule of Environmental Loss Contingencies and Asset Retirement Obligations [Table Text Block]
Schedule of Environmental Loss Contingencies and Asset Retirement Obligations [Table Text Block]
Asset Retirement Obligation Disclosure
Schedule of Change in Asset Retirement Obligation [Table Text Block]
Measurement Basis [Axis]
Measurement Basis [Axis]
Fair Value Measurement [Domain]
Fair Value Measurement [Domain]
Portion at Fair Value Measurement [Member]
Portion at Fair Value Measurement [Member]
Reported Value Measurement [Member]
Reported Value Measurement [Member]
Senior Notes - $1.3 Billion [Member]
Senior Notes One Point Three Billion [Member]
Senior Notes One Point Three Billion [Member]
Senior Notes - $400 Million [Member]
Senior Notes - $500 Million [Member]
Senior Notes, Noncurrent
Senior Notes, Noncurrent
Debt Instrument, Face Amount
Long-term debt:
Long Term Debt Noncurrent Fair Value [Abstract]
Long Term Debt Noncurrent Fair Value [Abstract]
Debt Instrument, Fair Value Disclosure
Debt Instrument, Fair Value Disclosure
Revolving loan, carrying value
Revolving loan, fair value
Lines of Credit, Fair Value Disclosure
Total long-term debt, carrying value
Total long-term debt, fair value
Long-term Debt, Fair Value
Inventory Disclosure [Abstract]
Schedule Of Inventories
Schedule of Inventory, Current [Table Text Block]
Class of Stock [Axis]
Class of Stock [Axis]
Class of Stock [Domain]
Class of Stock [Domain]
Preferred Class A [Member]
Preferred Class A [Member]
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS
NET INCOME ATTRIBUTABLE TO CLIFFS COMMON SHAREHOLDERS
Weighted Average Number of Shares:
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Depositary Shares
Weighted Average Number of Shares Oustanding, Depositary
Weighted Average Number of Shares Oustanding, Depositary
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements
Diluted
Schedule Of Goodwill
Schedule of Goodwill [Table Text Block]
Schedule Of Finite-Lived Intangible Assets By Major Class
Schedule of Finite-Lived Intangible Assets [Table Text Block]
Estimated Amortization Expense Relating To Intangible Assets
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
Schedule Of Earnings To Be Recognized On Below-Market Sales Contract
Expected Revenue On Below Market Sales Contracts Table [Text Block]
Amounts expected to be recognized in product revenues for below market sales contracts.
Earnings Per Share Computation
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
FAIR VALUE OF FINANCIAL INSTRUMENTS
Fair Value Disclosures [Text Block]
Operating lease expense
Operating Leases, Rent Expense
Document and Entity Information [Abstract]
Document and Entity Information [Abstract]
Entity Registrant Name
Entity Registrant Name
Entity Central Index Key
Entity Central Index Key
Entity Filer Category
Entity Filer Category
Document Type
Document Type
Document Period End Date
Document Period End Date
Document Fiscal Year Focus
Document Fiscal Year Focus
Document Fiscal Period Focus
Document Fiscal Period Focus
Amendment Flag
Amendment Flag
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Trading Symbol
Trading Symbol
PROPERTY, PLANT AND EQUIPMENT
Property, Plant and Equipment Disclosure [Text Block]
Equity [Abstract]
CAPITAL STOCK
Capital Stock Disclosure [Text Block]
Capital Stock Disclosure Text Block
Fair Value, Assets And Liabilities Components [Table]
Fair Value Assets And Liabilities Components [Table]
Fair Value, Assets And Liabilities Components [Table]
Wabush and Cliffs Chromite Ontario and Cliffs Chromite Far North [Member]
Wabush and Cliffs Chromite Ontario and Cliffs Chromite Far North [Member]
Wabush and Cliffs Chromite Ontario and Cliffs Chromite Far North
Cliffs Chromite Ontario and Cliffs Chromite Far North [Member]
Cliffs Chromite Ontario and Cliffs Chromite Far North [Member]
Cliffs Chromite Ontario and Cliffs Chromite Far North [Member]
Amapa [Member]
Amapa [Member]
Amapa [Member]
Fair Value, Assets And Liabilities Components [Line Items]
Fair Value Assets And Liabilities Components [Line Items]
Fair Value, Assets And Liabilities Components [Line Items]
Management Estimate of 62% Fe
Management Estimate of 62% Fe
Management Estimate of 62% Fe
Equity Method Investments, Fair Value Disclosure
Equity Method Investments, Fair Value Disclosure
Equity Method Investment, Other than Temporary Impairment
Equity Method Investment, Other than Temporary Impairment
Goodwill, Impairment Loss
Impairment of Long-Lived Assets Held-for-use
Impairment of Long-Lived Assets Held-for-use
Debt Maturities Remainder 2014
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year
Debt Maturities 2015
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months
Debt Maturities 2016
Long-term Debt, Maturities, Repayments of Principal in Year Two
Debt Maturities 2017
Long-term Debt, Maturities, Repayments of Principal in Year Three
Debt Maturities 2018
Long-term Debt, Maturities, Repayments of Principal in Year Four
Debt Maturities 2019 and After
Long-term Debt, Maturities, Repayments of Principal after Year Five
Long-term Debt, Maturities, Total
Long-term Debt, Maturities, Total
Long-term Debt, Maturities, Total
Non-Cash Financing Activities [Abstract]
Non-Cash Financing Activities [Abstract]
Dividends Payable [Table]
Dividends Payable [Table]
Depositary Share [Member]
Depositary Shares [Member]
Depositary Shares [Member]
Dividends Payable [Line Items]
Dividends Payable [Line Items]
Depositary Share Interest in a Share of 7% Series A Mandatory Convertible Preferred Stock, Class A
Depositary Share Interest in a Share of 7% Series A Mandatory Convertible Preferred Stock, Class A
Depositary Share Interest in a Share of 7% Series A Mandatory Convertible Preferred Stock, Class A
Dividends payable, per share
Dividends Payable, Amount Per Share
Preferred stock cash dividend
Capital Stock [Table]
Schedule of Stock by Class [Table]
Common Stock [Member]
Common Stock [Member]
Common Stock from when Mandatory Convertible Preferred Stock Converts on February 1, 2016 [Member]
Common Stock from when Mandatory Convertible Preferred Stock Converts on February 1, 2016 [Member]
Common Stock from when Mandatory Convertible Preferred Stock Converts on February 1, 2016 [Member]
Class of Stock [Line Items]
Class of Stock [Line Items]
Depositary Share Offering included in Depositary Share Issuance
Depositary Share Offering included in Depositary Share Issuance
Depositary Share Offering included in Depositary Share Issuance
Number of Shares included in Depositary Share Issuance due to Exercise of
Number of Shares included in Depositary Share Issuance due to Exercise of Underwriters' Over-allotment Option
Number of Shares included in Depositary Share Issuance due to Exercise of Underwriters' Over-allotment Option to Purchase Addtional Depositary Shares
Series A Mandatory Convertible Preferred Stock, Class A, Percentage
Preferred Stock, Dividend Rate, Percentage
Convertible Preferred Stock, Shares Issued upon Conversion
Convertible Preferred Stock, Shares Issued upon Conversion
Convertible Preferred Stock, Shares Issued Upon Conversion per Depositary Share
Convertible Preferred Stock, Shares Issued Upon Conversion per Depositary Share
Convertible Preferred Stock, Shares Issued Upon Conversion per Depositary Share
Preferred Stock, Liquidation Preference Per Share
Preferred Stock, Liquidation Preference Per Share
Common Stock, Par or Stated Value Per Share
Common Stock, Par or Stated Value Per Share
Trading Day Window Determining Number of Common Shares Issuable on Conversion
Trading Day Window Determining Number of Common Shares Issuable on Conversion
Trading Day Window Determining Number of Common Shares Issuable on Conversion
Number of Common Shares Mandatory Convertible Stock Converts to on February 1, 2016
Convertible Preferred Stock, Total Shares Issued Upon Conversion
Convertible Preferred Stock, Total Shares Issued Upon Conversion
Dividends, Preferred Stock
Percentage increase (decrease) in dividends payable
Increase Decrease In Dividends Payable Percentage
Increase (Decrease) In Dividends Payable, Percentage
Issuance of common shares, public offering (in shares)
Stock Issued During Period, Shares, New Issues
Closing price per share (in usd per share)
Share Price
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance - January 1
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value
Total gains
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Abstract]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Abstract]
Included in earnings
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings
Settlements
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements
Transfers into Level 3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3
Transfers out of Level 3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3
Ending balance - June 30
Total gains for the period included in earnings attributable to the change in unrealized gains on assets still held at the reporting date
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance - January 1
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value
Total gains
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Abstract]
Fair Value, Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Abstract]
Included in earnings
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings
Settlements
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements
Transfers into Level 3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3
Transfers out of Level 3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3
Ending balance - June 30
Total losses for the period included in earnings attributable to the change in unrealized losses on liabilities still held at the reporting date
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)
Fair Value Measurements, Recurring and Nonrecurring [Table]
Fair Value Measurements, Recurring and Nonrecurring [Table]
Fair Value Of Assets And Liabilities Measure On Unobservable Input [Axis]
Fair Value Of Assets And Liabilities Measure On Unobservable Input [Axis]
Fair Value Of Assets And Liabilities Measure On Unobservable Input [Axis]
Fair Value Of Assets And Liabilities Measure On Unobservable Input [Domain]
Fair Value Of Assets And Liabilities Measure On Unobservable Input [Domain]
Fair Value Of Assets And Liabilities Measure On Unobservable Input [Domain]
Managements Estimate Of 62% Fee [Member]
Managements Estimate Of Sixty Two Percent [Member]
Managements Estimate Of Sixty Two Percent [Member]
Hot-Rolled Steel Estimate [Member]
Hot Rolled Steel Estimate [Member]
Hot-Rolled Steel Estimate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurement with unobservable inputs derivative asset range
Fair Value Measurement With Unobservable Inputs Derivative Asset Range
Fair value measurement with unobservable inputs derivative asset range
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Equity Components [Axis]
Equity Components [Axis]
Equity Component [Domain]
Equity Component [Domain]
Cliffs Shareholders Equity [Member]
Parent [Member]
Reclassification out of Accumulated Other Comprehensive Income [Axis]
Reclassification out of Accumulated Other Comprehensive Income [Axis]
Reclassification out of Accumulated Other Comprehensive Income [Domain]
Reclassification out of Accumulated Other Comprehensive Income [Domain]
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Translation Adjustment [Member]
Accumulated Translation Adjustment [Member]
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Other Comprehensive Income Location [Axis]
Other Comprehensive Income Location [Axis]
Other Comprehensive Income Location [Domain]
Other Comprehensive Income Location [Domain]
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss), Net of Tax
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax
Other Comprehensive Income (Loss), before Reclassifications, before Tax
Other Comprehensive Income (Loss), before Reclassifications, before Tax
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)
Inventory, Current [Table]
Inventory, Current [Table]
Inventory type [Axis]
Inventory type [Axis]
Inventory type [Axis]
Inventory Type [Domain]
Inventory type [Domain]
[Domain] for Inventory type [Axis]
Pellets [Member]
Pellets [Member]
Pellets [Member]
Sinter feed [Member]
Sinter feed [Member]
Sinter feed [Member]
Income Statement Location [Axis]
Inventory [Line Items]
Inventory [Line Items]
Inventory Write-down
Inventory Write-down
Unsaleable Inventory Impairment Charge
Unsaleable Inventory Impairment Charge
Unsaleable Inventory Impairment Charge
Income Tax Disclosure [Abstract]
Statutory Tax Rate [Table]
Statutory Tax Rate [Table]
Statutory Tax Rate [Table]
Income Tax Authority [Axis]
Income Tax Authority [Axis]
Income Tax Authority [Domain]
Income Tax Authority [Domain]
United States [Member]
UNITED STATES
Canada
CANADA
Statutory Tax Rate [Line Items]
Statutory Tax Rate [Line Items]
[Line Items] for Statutory Tax Rate [Table]
Income Tax Expense (Benefit)
Discrete Tax Items Expense (Benefit)
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount
Tax Benefit of Income Not Subject to Tax
Tax Benefit of Income Not Subject to Tax
Tax Benefit of Income Not Subject to Tax
Benefit of Intercompany Loan between U.S. and Canada
Benefit of Intercompany Loan between U.S. and Canada
Benefit of Intercompany Loan between U.S. and Canada
Expected Benefit from Intercompany Loan between Canada and Australia
Expected Benefit from Intercompany Loan between Canada and Australia
Expected Benefit from Intercompany Loan between Canada and Australia
Total environmental and mine closure obligations
Asia Pacific Iron Ore [Member]
Product Segment [Axis]
Product Segment [Axis]
Product Segment [Axis]
Product Segment [Domain]
Product Segment [Domain]
Product Segment [Domain]
Metallurgical Coal Mines [Member]
Metallurgical Coal Mines [Member]
Metallurgical Coal Mines [Member]
Thermal Coal Mines [Member]
Thermal Coal Mines [Member]
Thermal Coal Mines [Member]
Number of mines (in number of facilities)
Number Of Mines
Number of mines
Inventory, Net [Abstract]
Inventory, Net [Abstract]
Finished Goods
Inventory, Finished Goods, Net of Reserves
Work-in Process
Inventory, Work in Process, Net of Reserves
Total Inventory
Inventory, Net
Estimated amortization expense, intangible assets [Abstract]
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2014 (remaining six months)
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year
2015
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months
2016
Finite-Lived Intangible Assets, Amortization Expense, Year Two
2017
Finite-Lived Intangible Assets, Amortization Expense, Year Three
2018
Finite-Lived Intangible Assets, Amortization Expense, Year Four
2019
Finite-Lived Intangible Assets, Amortization Expense, after Year Five
Total
Total Amortization Expense Finite-Lived Intangible Assets
Total Amortization Expense Finite-Lived Intangible Assets
GOODWILL AND OTHER INTANGIBLE ASSETS AND LIABILITIES
Goodwill and Intangible Assets Disclosure [Text Block]
Asset Retirement Obligation [Roll Forward]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset retirement obligation at beginning of period
Asset Retirement Obligation
Accretion expense
Asset Retirement Obligation, Accretion Expense
Exchange rate changes
Asset Retirement Obligation, Foreign Currency Translation
Revision in estimated cash flows
Asset Retirement Obligation, Revision of Estimate
Asset retirement obligation at end of period
Inventories
Inventory Disclosure [Text Block]
Shareholders' Equity [Table]
Schedule of Capitalization, Equity [Table]
Noncontrolling Interest [Member]
Noncontrolling Interest [Member]
Stockholders' Equity Attributable to Parent
Stockholders' Equity Attributable to Parent
Stockholders' Equity Attributable to Noncontrolling Interest
Stockholders' Equity Attributable to Noncontrolling Interest
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS
INCOME (LOSS) ATTRIBUTABLE TO NONCONTROLLING INTEREST
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest
Other Comprehensive (Income) Loss, Net of Tax, Portion Attributable to Noncontrolling Interest
Other Comprehensive Income (Loss), Net of Tax
Other Comprehensive Income (Loss), Net of Tax
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
OTHER COMPREHENSIVE INCOME ATTRIBUTABLE TO THE NONCONTROLLING INTEREST
Comprehensive (Income) Loss, Net of Tax, Attributable to Noncontrolling Interest
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest
Stock Issued During Period, Value, New Issues
Stock Issued During Period, Value, New Issues
Stock and Other Incentive Plans
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition
Common and preferred share dividends
Dividends, Stock
Undistributed Gains To Noncontrolling Interest
Undistributed Earnings Losses Related to Noncontrolling Interests
Undistributed Earnings Losses Related to Noncontrolling Interests
Capital Contribution By Noncontrolling Interest
Capital Contribution By Noncontrolling Interest
The capital contribution by noncontrolling interest to subsidiary
Joint Venture Partners [Member]
Co-venturer [Member]
Extension of ArcelorMittal Contract
Extension of ArcelorMittal Contract
Extension of ArcelorMittal Contract
Due from Related Parties, Current
Due from Related Parties, Current
Due to Related Parties, Current
Due to Related Parties, Current
Schedule of Equity Method Investments [Table]
Schedule of Equity Method Investments [Table]
Other Noncurrent Liabilities [Member]
Other Noncurrent Liabilities [Member]
Other Equity Investees [Member]
Other Equity Investees [Member]
Other Equity Investees [Member]
Schedule of Equity Method Investments [Line Items]
Schedule of Equity Method Investments [Line Items]
Investment
Equity Method Investments
EARNINGS PER SHARE
Earnings Per Share [Text Block]
Income Taxes
Income Tax Disclosure [Text Block]
Statement of Financial Position [Abstract]
ASSETS
Assets [Abstract]
CURRENT ASSETS
Assets, Current [Abstract]
Cash and cash equivalents
Cash and Cash Equivalents, at Carrying Value
Accounts receivable, net
Accounts Receivable, Net, Current
Inventories
Supplies and other inventories
Prepaid Supplies
Income tax receivable
Income Taxes Receivable, Current
Other current assets
Other Assets, Current
TOTAL CURRENT ASSETS
Assets, Current
PROPERTY, PLANT AND EQUIPMENT, NET
OTHER ASSETS
Other Assets, Noncurrent
TOTAL ASSETS
LIABILITIES
Liabilities [Abstract]
CURRENT LIABILITIES
Liabilities, Current [Abstract]
Accounts payable
Accounts Payable, Current
Accrued expenses
Accrued Liabilities, Current
Short-term and current portion of long-term debt
Other current liabilities
Other Liabilities, Current
TOTAL CURRENT LIABILITIES
Liabilities, Current
PENSION AND POSTEMPLOYMENT BENEFIT LIABILITIES
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent
ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS
Mine Reclamation and Closing Liability, Noncurrent
DEFERRED INCOME TAXES
Deferred Tax Liabilities, Net, Noncurrent
LONG-TERM DEBT
OTHER LIABILITIES
Other Liabilities, Noncurrent
TOTAL LIABILITIES
Liabilities
COMMITMENTS AND CONTINGENCIES (SEE NOTE 18)
Commitments and Contingencies
EQUITY
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
CLIFFS SHAREHOLDERS' EQUITY
Stockholders' Equity Attributable to Parent [Abstract]
Preferred Stock - no par value, Class A - 3,000,000 shares authorized, 7 % Series A Mandatory Convertible, Class A, no par value and $1,000 per share liquidation preference (See Note 14), Issued and Outstanding - 731,233 shares (2013 - 731,250)
Preferred Shares, Issued and Outstanding, Value
Preferred Shares, Issued and Outstanding, Value
Common Shares - par value $0.125 per share, Authorized - 400,000,000 shares (2013- 400,000,000 shares); Issued - 159,546,224 shares (2013 - 159,546,224 shares); Outstanding - 153,182,592 shares (2013 - 153,126,291 shares)
Common Stock, Value, Outstanding
Capital in excess of par value of shares
Additional Paid in Capital
Retained earnings
Retained Earnings (Accumulated Deficit)
Cost of 6,363,632 common shares in treasury (2013 - 6,419,933 shares)
Treasury Stock, Value
TOTAL CLIFFS SHAREHOLDERS' EQUITY
NONCONTROLLING INTEREST
TOTAL EQUITY
TOTAL LIABILITIES AND EQUITY
Liabilities and Equity
Statement of Comprehensive Income [Abstract]
OTHER COMPREHENSIVE INCOME (LOSS)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Changes in pension and other post-retirement benefits, net of tax
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax
Unrealized net gain (loss) on marketable securities, net of tax
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax
Unrealized net gain (loss) on foreign currency translation
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax
Unrealized net gain (loss) on derivative financial instruments, net of tax
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax
OTHER COMPREHENSIVE INCOME (LOSS)
TOTAL COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS
Award Type [Axis]
Award Type [Axis]
Award Type [Domain]
Equity Award [Domain]
Performance Shares [Member]
Performance Shares [Member]
Grant Date Market Price
Share Based Compensation Arrangement By Share Based Payment Award Grant Date Price
Share Based Compensation Arrangement by Share Based Payment Award Grant Date Price
Average Expected Term (Years)
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term
Expected Volatility
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate
Risk-Free Interest Rate
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate
Dividend Yield
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate
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
Fair Value (Percent of Grant Date Market Price)
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion)
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net
Customer Supply Agreements [Member]
Customer Supply Agreements [Member]
Customer Supply Agreements [Member]
Other Income [Member]
Other Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) [Line Items]
Details of Other Comprehensive Income (Loss) Components [Abstract]
Details of Other Comprehensive Income (Loss) Components [Abstract]
Details of Accumulated Other Comprehensive Income (Loss) Components [Table]
Details of Accumulated Other Comprehensive Income (Loss) Components [Table]
Details of Accumulated Other Comprehensive Income (Loss) Components [Table]
Realized Gain (Loss) on Marketable Securities [Member]
Realized Gain (Loss) on Marketable Securities [Member]
Realized Gain (Loss) on Marketable Securities [Member]
Accumulated Other-than-Temporary Impairment [Member]
Accumulated Other-than-Temporary Impairment [Member]
Realized Gain (Loss) on Marketable Securities and Other than Temporary Impairment [Member]
Realized Gain (Loss) on Marketable Securities and Other than Temporary Impairment [Member]
Realized Gain (Loss) on Marketable Securities and Other than Temporary Impairment [Member]
Realized Gain Loss On Derivatives [Member]
Realized Gain Loss On Derivatives [Member]
Gains and losses realized and included in earnings.
Australian Hedge Contracts [Member]
Australian Hedge Contracts [Member]
Australian Hedge Contracts [Member]
Canadian Hedge Contracts [Member]
Canadian Hedge Contracts [Member]
Canadian Hedge Contracts [Member]
Details of Accumulated Other Comprehensive Income (Loss) Components [Line Items]
Details of Accumulated Other Comprehensive Income (Loss) Components [Line Items]
[Line Items] for Details of Accumulated Other Comprehensive Income (Loss) Components [Table]
Defined Benefit Plan, Amortization of Gains (Losses)
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before Tax
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net (Gain) Loss, Net of Tax
Marketable Securities, Realized Gain (Loss)
Marketable Securities, Realized Gain (Loss)
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, before Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, before Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities and Impairment on Securities Arising During Period, before tax
Other Comprehensive Income (Loss), Realized Holding Gain (Loss) on Securities and Impairment on Securities Arising During Period, before tax
Other Comprehensive Income (Loss), Realized Holding Gain (Loss) on Securities and Impairment on Securities Arising During Period, before tax
Other Comprehensive Income (Loss), Realized Holding Gain (Loss) on Securities and Impairment on Securities Arising During Period, Tax
Other Comprehensive Income (Loss), Realized Holding Gain (Loss) on Securities and Impairment on Securities Arising During Period, Tax
Other Comprehensive Income (Loss), Realized Holding Gain (Loss) on Securities and Impairment on Securities Arising During Period, Tax
Other Comprehensive Income (Loss), Realized Holding Gain (Loss) on Securities and Impairment on Securities Arising During Period, net of tax
Other Comprehensive Income (Loss), Realized Holding Gain (Loss) on Securities and Impairment on Securities Arising During Period, net of tax
Other Comprehensive Income (Loss), Realized Holding Gain (Loss) on Securities and Impairment on Securities Arising During Period, net of tax
Derivative Instruments, (Gain) Loss Reclassified from Accumulated OCI into Income, Effective Portion, Net
(Gain) Loss on Derivative Instruments, Net, Pretax
Gain (Loss) on Derivative Instruments, Net, Pretax
Tax on Derivative Instruments Gain/Loss Reclassified from Accumulated OCI in to Earnings
TaxOnDerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoEarnings
Tax On Derivative Instruments Gain Loss Reclassified From Accumulated OCI Into Earnings
Amount of (gain)/loss recognized in income on derivative
Total Amount Reclassified from Accumulated Other Comprehensive Income (Loss) During the Period
Total Amount Reclassified from Accumulated Other Comprehensive Income (Loss) During the Period
Total Amount Reclassified from Accumulated Other Comprehensive Income (Loss) During the Period
ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS
Environmental Loss Contingency And Mine Closure Obligation Disclosure [Text Block]
Disclosures of environmental loss contingencies, such as presence of hazardous waste, relevant information from reports issued by regulators, and estimated costs to achieve compliance with regulatory requirements. Disclosures of accrued closure obligations for active or inactive mining operations that based upon contractual and legal obligations.
COMMITMENTS AND CONTINGENCIES
Commitments and Contingencies Disclosure [Text Block]
Goodwill, Fair Value Disclosure
Goodwill, Fair Value Disclosure
Property, Plant, and Equipment, Fair Value Disclosure
Property, Plant, and Equipment, Fair Value Disclosure
Finite-lived Intangible Assets, Fair Value Disclosure
Finite-lived Intangible Assets, Fair Value Disclosure
Other Asset Impairment Charges
Other Asset Impairment Charges
ASSETS:
Assets, Fair Value Disclosure, Nonrecurring
Assets, Fair Value Disclosure, Nonrecurring
Impairment Charges
Impairment Charges
Impairment charges including, but not limited to, impairment charges related to intangible and tangible assets, investment, and goodwill.
Preferred Class B [Member]
Preferred Class B [Member]
Preferred stock, par value
Preferred Stock, Par or Stated Value Per Share
Cumulative Mandatory Convertible
Cumulative Mandatory Convertible
Cumulative Mandatory Convertible
Preferred stock, shares authorized (in shares)
Preferred Stock, Shares Authorized
Preferred Shares, Issued and Outstanding, Shares
Preferred Shares, Issued and Outstanding, Shares
Preferred Shares, Issued and Outstanding, Shares
Common shares, par value
Common shares, authorized (in shares)
Common Stock, Shares Authorized
Common shares, issued (in shares)
Common Stock, Shares, Issued
Common shares, outstanding
Common Stock, Shares, Outstanding
Common shares in treasury
Treasury Stock, Shares