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Accounts Receivable and Contract Assets (Summary of Accounts Receivable) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable | $ 921.3 | $ 720.9
Less: Allowance for doubtful accounts | (8.4) | (5.9)
Less: Long-term portion of accounts receivable, net | (172.2) | (101.0)
Accounts receivable, net | 740.7 | 614.0
Contracts in transit |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable | 375.3 | 286.8
Trade receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable | 71.0 | 67.0
Vehicle receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable | 88.0 | 61.8
Manufacturer receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable | 119.4 | 118.1
Auto loan receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable | 256.0 | 175.6
Less: Allowance for doubtful accounts | (12.4) |
Other receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable | $ 11.6 | $ 11.6

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