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Accounts Receivable and Contract Assets (Summary of Accounts Receivable) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable $ 535.5 $ 573.7
Less: Allowance for doubtful accounts (6.9) (7.2)
Less: Long-term portion of accounts receivable, net (37.6) (37.1)
Accounts receivable, net $ 491.0 529.4
Period that contracts in transit are outstanding 10 days  
Threshold period for interest to bear on receivables 60 days  
Contracts in transit    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable $ 259.5 294.0
Trade receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable 54.0 54.3
Vehicle receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable 49.9 51.6
Manufacturer receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable 95.2 105.5
Auto loan receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable 62.1 61.5
Other receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable $ 14.8 $ 6.8