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Change in Benefit Obligation and Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year $ 702.2    
Fair value of plan assets at end of year 625.8 $ 702.2  
Pension Plan [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 824.0 717.6  
Service cost 2.6 3.6 $ 2.9
Interest cost 27.3 28.9 28.8
Plan amendments 4.3 0.5  
Actuarial loss (gain) (63.2) 28.1  
Change in GM Portion of OPEB Obligation 0.0 0.0  
Participant contributions 0.3 0.3  
Curtailments (11.6) 0.0  
Settlements (0.6) 14.3  
Benefit payments (39.7) (40.8)  
MPG acquisition / business combination 0.0 82.3  
Currency fluctuations (9.4) 17.8  
Other 0.5 0.0  
Net change (89.5) 106.4  
Benefit obligation at end of year 734.5 824.0 717.6
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 702.2 611.3  
Actual return on plan assets (31.0) 74.9  
Employer contributions 4.4 4.4  
Participant contributions 0.3 0.3  
Benefit payments (39.8) (40.8)  
Settlements (0.6) (14.3)  
MPG acquisition / business combination 0.0 49.9  
Currency fluctuations (9.7) 16.5  
Net change (76.4) 90.9  
Fair value of plan assets at end of year 625.8 702.2 611.3
Other Postretirement Benefits Plan [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 613.3 571.7  
Service cost 0.4 0.3 0.3
Interest cost 12.4 13.3 14.0
Plan amendments (2.3) 0.0  
Actuarial loss (gain) (43.8) 22.6  
Change in GM Portion of OPEB Obligation (32.6) 16.5  
Participant contributions 0.0 0.0  
Curtailments (0.2) 0.0  
Settlements 0.0 0.0  
Benefit payments (9.9) (12.5)  
MPG acquisition / business combination 0.0 1.4  
Currency fluctuations 0.0 0.0  
Other 0.0 0.0  
Net change (76.0) 41.6  
Benefit obligation at end of year 537.3 613.3 571.7
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 9.9 12.5  
Participant contributions 0.0 0.0  
Benefit payments (9.9) (12.5)  
Settlements 0.0 0.0  
MPG acquisition / business combination 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