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Intangible Assets - Information by Segment (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Intangible assets    
Goodwill $ 2,071.0 $ 1,928.4
Retail automotive dealership    
Intangible assets    
Goodwill 1,615.7  
Retail commercial truck dealership    
Intangible assets    
Goodwill 373.1  
Other    
Intangible assets    
Goodwill 82.2  
Non-Automotive Investments    
Intangible assets    
Goodwill $ 0.0