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Inventories (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 02, 2018
Inventories        
Retail automotive dealership new vehicles $ 2,397.0 $ 2,344.1    
Retail automotive dealership used vehicles 1,060.8 993.1    
Retail automotive parts, accessories and other 140.8 141.7    
Retail commercial truck dealership vehicles and parts 207.9 207.0    
Commercial vehicle distribution vehicles, parts and engines 233.6 258.2    
Total inventories 4,040.1 3,944.1   $ 3,930.7
Interest credits and advertising assistance $ 54.6 $ 55.4 $ 51.6