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Accounts Receivable and Contract Assets (Summary of Accounts Receivable) (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable $ 1,275.9 $ 720.9
Less: Allowance for doubtful accounts (14.3) (5.9)
Less: Long-term portion of accounts receivable, net (449.0) (101.0)
Accounts receivable, net 812.6 614.0
Contracts in transit    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable 300.7 286.8
Trade receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable 111.1 67.0
Vehicle receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable 93.8 61.8
Manufacturer receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable 113.8 118.1
Auto loan and lease receivables total    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable 535.1 175.6
Less: Allowance for doubtful accounts (17.2)  
Sales-type lease receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable 102.6 0.0
Other receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable $ 18.8 $ 11.6