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Acquisitions (Purchase Price Allocation) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Combination Segment Allocation [Line Items]      
Supplemental pro forma revenue $ 21,945.6 $ 22,169.9  
Supplemental pro forma net income from continuing operations 434.1 469.4  
Receivables, net 19.9    
Inventory 272.4    
Property and equipment 130.4    
Goodwill 140.4    
Franchise rights - indefinite-lived 169.2    
Other assets 9.4    
Accounts payable (9.0)    
Vehicle floorplan payable - non-trade (264.4)    
Deferred income taxes (7.5)    
Other liabilities (13.0)    
Aggregate purchase price 447.8    
Capital leases and other obligations (37.4)    
Cash used in business acquisitions, net of cash acquired 410.4 $ 321.5 $ 205.2
Reporting Unit, Domestic [Member]      
Business Combination Segment Allocation [Line Items]      
Goodwill 57.9    
Reporting Unit, Import [Member]      
Business Combination Segment Allocation [Line Items]      
Goodwill 2.0    
Reporting Unit, Premium Luxury [Member]      
Business Combination Segment Allocation [Line Items]      
Goodwill 76.9    
Goodwill Corporate and Other [Member]      
Business Combination Segment Allocation [Line Items]      
Goodwill $ 3.6