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Accounts Receivable (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable gross | $ 720.9 | $ 567.4
Less: Allowance for doubtful accounts | (5.9) | (7.3)
Less: Long-term portion of accounts receivable, net1 | (101.0) | (55.1)
Total accounts receivable, net | 614.0 | 505.0
Contracts in transit |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable gross | 286.8 | 269.7
Trade receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable gross | 67.0 | 52.8
Vehicle receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable gross | 61.8 | 50.9
Manufacturer receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable gross | 118.1 | 112.4
Auto loan receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable gross | 175.6 | 62.2
Other receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable gross | $ 11.6 | $ 19.4

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