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Employee Benefit Plans - Change in Benefit Obligation and Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year $ 408.1    
Fair value of plan assets at end of year 376.5 $ 408.1  
Pension Plan [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 486.9 482.4  
Service cost 1.0 1.1 $ 1.7
Interest cost 23.2 24.4 16.5
Plan amendments 0.0 (0.6)  
Actuarial loss (gain) (12.6) 6.7  
Change in GM portion of OPEB obligation 0.0 0.0  
Participant contributions 0.1 0.2  
Curtailments 0.0 (0.5)  
Settlements 0.0 (6.1)  
Benefit payments (35.5) (27.5)  
Currency fluctuations (3.8) 6.8  
Net change (27.6) 4.5  
Benefit obligation at end of year 459.3 486.9 482.4
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 408.1 406.9  
Actual return on plan assets 1.9 19.0  
Employer contributions 4.5 9.2  
Participant contributions 0.1 0.2  
Benefit payments (35.5) (27.5)  
Settlements 0.0 (6.1)  
Currency fluctuations (2.6) 6.4  
Net change (31.6) 1.2  
Fair value of plan assets at end of year 376.5 408.1 406.9
Other Postretirement Benefits Plan [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 287.8 329.6  
Service cost 0.2 0.2 0.3
Interest cost 8.4 10.1 8.4
Plan amendments (1.9) 0.0  
Actuarial loss (gain) (0.9) (21.4)  
Change in GM portion of OPEB obligation 0.4 (18.2)  
Participant contributions 0.0 0.0  
Curtailments 0.0 0.0  
Settlements 0.0 0.0  
Benefit payments (8.7) (12.5)  
Currency fluctuations 0.0 0.0  
Net change (2.5) (41.8)  
Benefit obligation at end of year 285.3 287.8 329.6
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 0.0 0.0  
Actual return on plan assets 0.0 0.0  
Employer contributions 8.7 12.5  
Participant contributions 0.0 0.0  
Benefit payments (8.7) (12.5)  
Settlements 0.0 0.0  
Currency fluctuations 0.0 0.0  
Net change 0.0 0.0  
Fair value of plan assets at end of year $ 0.0 $ 0.0 $ 0.0