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Goodwill and Franchise Value (Schedule of Goodwill) (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2008
Goodwill [Roll Forward]      
Beginning balance $ 593.0 $ 454.6  
Additions through acquisitions 150.5 144.9  
Reductions through divestitures (3.2) (3.0)  
Reductions from impairments   (3.5)  
Ending balance 740.3 593.0  
Accumulated impairment loss     $ 299.3
Domestic      
Goodwill [Roll Forward]      
Beginning balance 204.5 171.8  
Additions through acquisitions 52.0 33.3  
Reductions through divestitures 0.0 (0.1)  
Reductions from impairments   (0.5)  
Ending balance 256.5 204.5  
Import      
Goodwill [Roll Forward]      
Beginning balance 287.9 197.3  
Additions through acquisitions 64.3 94.3  
Reductions through divestitures (3.2) (0.7)  
Reductions from impairments   (3.0)  
Ending balance 349.0 287.9  
Luxury      
Goodwill [Roll Forward]      
Beginning balance 100.6 85.5  
Additions through acquisitions 34.2 17.3  
Reductions through divestitures 0.0 (2.2)  
Reductions from impairments   0.0  
Ending balance $ 134.8 $ 100.6