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Restructuring and Impairment (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Restructuring Cost and Reserve        
Restructuring and impairment charges $ 17.5 $ 1.0 $ 18.9 $ 2.3
Impairments of inventory 5.0   4.9  
Other restructuring and impairment charges 12.5   14.0  
Motor Wheel Brake Drum and Crewson Brake        
Restructuring Cost and Reserve        
Restructuring and impairment charges 11.1      
Impairments of inventory 3.6      
Impairment of intangible assets     3.5  
Severance costs     $ 4.0  
Lunar Air Disc Brake | Disposal Group, Held-for-sale, Not Discontinued Operations        
Restructuring Cost and Reserve        
Impairments of inventory 0.5      
Incurred impairment charges 2.1      
Impairment of long-lived assets $ 1.6