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Employee Benefit Plans - Change in Benefit Obligation and Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year $ 636.6    
Fair value of plan assets at end of year 669.9 $ 636.6  
Pension Plan [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 740.2 734.5  
Service cost 2.0 1.5 $ 2.6
Interest cost 21.4 28.0 27.3
Actuarial loss 63.5 71.5  
Change in GM portion of OPEB obligation 0.0 0.0  
Participant contributions 0.2 0.2  
Curtailments 0.0 (1.9)  
Settlements (3.3) (28.8)  
Benefit payments (34.4) (44.1)  
Sale of business 0.0 (26.2)  
Currency fluctuations 8.7 5.5  
Other 0.6 0.0  
Net change 58.7 5.7  
Benefit obligation at end of year 798.9 740.2 734.5
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 636.6 625.8  
Actual return on plan assets 55.7 87.5  
Employer contributions 8.5 10.0  
Participant contributions 0.2 0.2  
Benefit payments (34.4) (44.1)  
Settlements (3.3) (28.8)  
Sale of business 0.0 (20.7)  
Currency fluctuations 6.6 6.7  
Net change 33.3 10.8  
Fair value of plan assets at end of year 669.9 636.6 625.8
Other Postretirement Benefits Plan [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 549.1 537.3  
Service cost 0.4 0.3 0.4
Interest cost 10.2 12.8 12.4
Actuarial loss 25.3 11.9  
Change in GM portion of OPEB obligation 14.0 3.1  
Participant contributions 0.0 0.0  
Curtailments 0.0 0.0  
Settlements 0.0 0.0  
Benefit payments (12.5) (15.5)  
Sale of business 0.0 (0.8)  
Currency fluctuations 0.0 0.0  
Other 0.0 0.0  
Net change 37.4 11.8  
Benefit obligation at end of year 586.5 549.1 537.3
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 12.5 15.5  
Participant contributions 0.0 0.0  
Benefit payments (12.5) (15.5)  
Settlements 0.0 0.0  
Sale of business 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