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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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