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Accounts Receivable and Contract Assets (Summary of Accounts Receivable) (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable $ 505.3 $ 573.7
Less: Allowance for doubtful accounts (6.9) (7.2)
Less: Long-term portion of accounts receivable, net (38.7) (37.1)
Accounts receivable, net $ 459.7 529.4
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 $ 235.7 294.0
Trade receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable 54.8 54.3
Vehicle receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable 44.3 51.6
Manufacturer receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable 104.0 105.5
Auto loan receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable 62.5 61.5
Other receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable $ 4.0 $ 6.8