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Accounts Receivable and Contract Assets (Summary of Accounts Receivable) (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts receivable | $ 584.3 |  | $ 567.4
Less: Allowance for doubtful accounts | (6.3) |  | (7.3)
Less: Long-term portion of accounts receivable, net | (66.3) |  | (55.1)
Accounts receivable, net | 511.7 | $ 504.5 | 505.0
Contracts in transit |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts receivable | 235.9 |  | 269.7
Trade receivables |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts receivable | 56.7 |  | 52.8
Vehicle receivables |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts receivable | 55.3 |  | 50.9
Manufacturer receivables |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts receivable | 107.1 |  | 112.4
Auto loan receivables |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts receivable | 95.8 |  | 62.2
Less: Allowance for doubtful accounts | (13.9) |  |
Other receivables |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts receivable | $ 33.5 |  | $ 19.4

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