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Accounts Receivable - Summary of Accounts Receivable (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable gross $ 573.7 $ 578.3
Less: Allowance for doubtful accounts (7.2) (7.4)
Less: Long-term portion of accounts receivable, net (37.1) (49.0)
Total accounts receivable, net $ 529.4 521.9
Threshold period for interest to bear on receivables 60 days  
Contracts in transit    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable gross $ 294.0 286.6
Trade receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable gross 54.3 45.9
Vehicle receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable gross 51.6 60.0
Manufacturer receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable gross 105.5 96.1
Auto loan receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable gross 61.5 75.1
Other receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable gross $ 6.8 $ 14.6
Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Period that contracts in transit are outstanding 5 days  
Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Period that contracts in transit are outstanding 10 days