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Employee Benefit Plans - Change in Benefit Obligation and Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year $ 669.9    
Fair value of plan assets at end of year 573.8 $ 669.9  
Pension Plan [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 798.9 740.2  
Service cost 2.0 2.0 $ 1.5
Interest cost 17.3 21.4 28.0
Actuarial loss (gain) (6.5) 63.5  
Change in GM portion of OPEB obligation 0.0 0.0  
Participant contributions 0.2 0.2  
Settlements (99.0) (3.3)  
Benefit payments (34.4) (34.4)  
Currency fluctuations (4.4) 8.7  
Other 0.0 0.6  
Net change (124.8) 58.7  
Benefit obligation at end of year 674.1 798.9 740.2
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 669.9 636.6  
Actual return on plan assets 31.6 55.7  
Employer contributions 7.8 8.5  
Participant contributions 0.2 0.2  
Benefit payments (34.4) (34.4)  
Settlements (99.0) (3.3)  
Currency fluctuations (2.3) 6.6  
Net change (96.1) 33.3  
Fair value of plan assets at end of year 573.8 669.9 636.6
Other Postretirement Benefits Plan [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 586.5 549.1  
Service cost 0.3 0.4 0.3
Interest cost 8.4 10.2 12.8
Actuarial loss (gain) (34.6) 25.3  
Change in GM portion of OPEB obligation (36.8) 14.0  
Participant contributions 0.0 0.0  
Settlements 0.0 0.0  
Benefit payments (14.2) (12.5)  
Currency fluctuations 0.0 0.0  
Other 0.0 0.0  
Net change (76.9) 37.4  
Benefit obligation at end of year 509.6 586.5 549.1
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 14.2 12.5  
Participant contributions 0.0 0.0  
Benefit payments (14.2) (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