v3.25.2
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