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Accounts Receivable and Contract Assets (Summary of Accounts Receivable) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable $ 1,061.3 $ 720.9
Less: Allowance for doubtful accounts (11.1) (5.9)
Less: Long-term portion of accounts receivable, net (250.5) (101.0)
Accounts receivable, net 799.7 614.0
Contracts in transit    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable 369.3 286.8
Trade receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable 87.3 67.0
Vehicle receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable 84.4 61.8
Manufacturer receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable 132.8 118.1
Auto loan receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable 370.9 175.6
Less: Allowance for doubtful accounts (13.3)  
Other receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable $ 16.6 $ 11.6