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Employee Benefit Plans - Change in Benefit Obligation and Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year $ 573.8    
Fair value of plan assets at end of year 406.9 $ 573.8  
Pension Plan [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 674.1 798.9  
Service cost 1.7 2.0 $ 2.0
Interest cost 16.5 17.3 21.4
Plan amendments 0.0 0.0  
Actuarial loss (gain) (175.9) (6.5)  
Change in GM portion of OPEB obligation 0.0 0.0  
Participant contributions 0.2 0.2  
Settlements 0.0 (99.0)  
Benefit payments (27.4) (34.4)  
Tekfor acquisition 14.3 0.0  
Currency fluctuations (21.1) (4.4)  
Net change (191.7) (124.8)  
Benefit obligation at end of year 482.4 674.1 798.9
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 573.8 669.9  
Actual return on plan assets (127.1) 31.6  
Employer contributions 2.5 7.8  
Participant contributions 0.2 0.2  
Benefit payments (27.4) (34.4)  
Settlements 0.0 (99.0)  
Tekfor acquisition 7.5 0.0  
Currency fluctuations (22.6) (2.3)  
Net change (166.9) (96.1)  
Fair value of plan assets at end of year 406.9 573.8 669.9
Other Postretirement Benefits Plan [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 509.6 586.5  
Service cost 0.3 0.3 0.4
Interest cost 8.4 8.4 10.2
Plan amendments (0.5) 0.0  
Actuarial loss (gain) (101.3) (34.6)  
Change in GM portion of OPEB obligation (75.0) (36.8)  
Participant contributions 0.0 0.0  
Settlements 0.0 0.0  
Benefit payments (11.9) (14.2)  
Tekfor acquisition 0.0 0.0  
Currency fluctuations 0.0 0.0  
Net change (180.0) (76.9)  
Benefit obligation at end of year 329.6 509.6 586.5
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 11.9 14.2  
Participant contributions 0.0 0.0  
Benefit payments (11.9) (14.2)  
Settlements 0.0 0.0  
Tekfor acquisition 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