Employee Benefit Plans and Other Postretirement Benefit Plans Narrative (Details) - USD ($) $ in Millions |
Jun. 30, 2026 |
Feb. 03, 2026 |
Jan. 01, 2026 |
Dec. 31, 2025 |
|---|---|---|---|---|
| Defined Benefit Plan Disclosure [Line Items] | ||||
| Liability, Defined Benefit Pension Plan, Noncurrent | $ 490.6 | $ 69.7 | ||
| Liability, Other Postretirement Defined Benefit Plan, Noncurrent | $ 310.8 | $ 276.6 | ||
| Dowlais Group plc | ||||
| Defined Benefit Plan Disclosure [Line Items] | ||||
| Liability, Defined Benefit Plan | $ 1,400.0 | |||
| Assets for Plan Benefits, Defined Benefit Plan | 1,000.0 | |||
| Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position | $ (400.0) | |||
| Pension Plan [Member] | ||||
| Defined Benefit Plan Disclosure [Line Items] | ||||
| Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year | $ 35.0 | |||
| Other Postretirement Benefits Plan [Member] | ||||
| Defined Benefit Plan Disclosure [Line Items] | ||||
| Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year | $ 16.1 |
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- Definition Amount of liability, recognized in statement of financial position, for defined benefit pension plan, classified as noncurrent. Excludes other postretirement benefit plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of contribution expected to be received by defined benefit plan from employer in remainder of current fiscal year. Excludes contribution previously paid by employer in current fiscal year. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of liability, recognized in statement of financial position, for defined benefit other postretirement plan, classified as noncurrent. Excludes pension plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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