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v3.25.3

Pension and Postretirement Benefits - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2025 | Sep. 30, 2025 | Sep. 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% | 10.625% |  |
Pension Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Cash contributions, pension plans |  | $ 317.2 | 17.6 | $ 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 |  | 24.0 |  |
Current year cash contributions |  | 309.0 |  |
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 |  | 33.0 |  |
Postretirement Benefit Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Current year cash contributions |  | 3.0 |  |
Cash contributions, postretirement benefits |  | $ 1.0 | $ 3.4 | $ 5.2

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