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Accounts Receivable and Contract Assets (Summary of Accounts Receivable) (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable | $ 505.3 | $ 573.7
Less: Allowance for doubtful accounts | (6.9) | (7.2)
Less: Long-term portion of accounts receivable, net | (38.7) | (37.1)
Accounts receivable, net | $ 459.7 | 529.4
Period that contracts in transit are outstanding | 10 days |
Threshold period for interest to bear on receivables | 60 days |
Contracts in transit |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable | $ 235.7 | 294.0
Trade receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable | 54.8 | 54.3
Vehicle receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable | 44.3 | 51.6
Manufacturer receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable | 104.0 | 105.5
Auto loan receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable | 62.5 | 61.5
Other receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable | $ 4.0 | $ 6.8

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