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Pension and Postretirement Benefits - Additional Information (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net proceeds | $ 700.0 | $ 0.0 |
10.625% senior secured notes due January 15, 2031 | Senior Notes |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Convertible senior notes interest rate | 10.625% |  |
Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Cash contributions, pension plans | $ 287.2 | 10.3 | $ 21.9
Current year cash contributions | 342.0 |  |
Pension Plans | United States |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Cash contributions, pension plans | 250.0 |  |
Cash payment for pension benefits | 50.0 |  |
Remainder of fiscal year cash contribution | 55.0 |  |
Current year cash contributions | 314.0 |  |
Pension Plans | United States | 10.625% senior secured notes due January 15, 2031 | Senior Notes |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net proceeds | 200.0 |  |
Pension Plans | International Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Current year cash contributions | 28.0 |  |
Postretirement Benefit Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Current year cash contributions | 3.0 |  |
Cash contributions, postretirement benefits | $ 0.4 | $ 2.1 | $ 5.2

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