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Revenues - Contract Balances (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Jan. 02, 2018
Dec. 31, 2017
Contract Balances      
Accounts receivable, net $ 929.1 $ 977.3 $ 954.9
Unearned revenues 269.8   302.6
Revenue recognized from unearned revenue 263.2    
Contracts in transit      
Contract Balances      
Accounts receivable, net 314.2   356.1
Vehicle receivables      
Contract Balances      
Accounts receivable, net 266.9   233.0
Manufacturer receivables      
Contract Balances      
Accounts receivable, net 211.3   230.1
Trade receivables      
Contract Balances      
Accounts receivable, net $ 129.1   $ 136.7