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Intangible Assets - Information by Segment (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Intangible assets    
Goodwill $ 1,660.4 $ 1,291.2
Retail Automotive Dealership    
Intangible assets    
Goodwill 1,411.6  
Retail Commercial Truck Dealership    
Intangible assets    
Goodwill 163.2  
Other    
Intangible assets    
Goodwill 85.6  
Non-Automotive Investments    
Intangible assets    
Goodwill $ 0.0