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Accounts Receivable and Contract Assets (Summary of Accounts Receivable) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts receivable $ 352.0   $ 567.4
Less: Allowance for doubtful accounts (6.8)   (7.3)
Less: Long-term portion of accounts receivable, net (47.0)   (55.1)
Accounts receivable, net 298.2 $ 504.5 505.0
Contracts in transit      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts receivable 120.7   269.7
Trade receivables      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts receivable 48.5   52.8
Vehicle receivables      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts receivable 28.9   50.9
Manufacturer receivables      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts receivable 77.4   112.4
Auto loan receivables      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts receivable 56.8   62.2
Less: Allowance for doubtful accounts (12.8)    
Other receivables      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts receivable $ 19.7   $ 19.4