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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

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