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Goodwill and Franchise Value - Goodwill (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2008
Goodwill [Roll Forward]      
Balance at the beginning $ 977.3 $ 593.0  
Additions through acquisitions 500.4 395.5  
Reductions through divestitures (17.9) (11.2)  
Currency translation 0.9    
Balance at the end 1,460.7 977.3  
Accumulated impairment losses     $ 299.3
Additions through acquisitions 500.4 395.5  
Vehicle Operations      
Goodwill [Roll Forward]      
Balance at the beginning 977.3 593.0  
Additions through acquisitions 483.4 395.5  
Reductions through divestitures (17.9) (11.2)  
Currency translation 0.7    
Balance at the end 1,443.5 977.3  
Additions through acquisitions 483.4 395.5  
Financing Operations      
Goodwill [Roll Forward]      
Balance at the beginning 0.0 0.0  
Additions through acquisitions 17.0 0.0  
Reductions through divestitures 0.0 0.0  
Currency translation 0.2    
Balance at the end 17.2 0.0  
Additions through acquisitions $ 17.0 $ 0.0