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Accounts Receivable - Summary of Accounts Receivable (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable gross | $ 573.7 | $ 578.3
Less: Allowance for doubtful accounts | (7.2) | (7.4)
Less: Long-term portion of accounts receivable, net | (37.1) | (49.0)
Total accounts receivable, net | $ 529.4 | 521.9
Threshold period for interest to bear on receivables | 60 days |
Contracts in transit |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable gross | $ 294.0 | 286.6
Trade receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable gross | 54.3 | 45.9
Vehicle receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable gross | 51.6 | 60.0
Manufacturer receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable gross | 105.5 | 96.1
Auto loan receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable gross | 61.5 | 75.1
Other receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable gross | $ 6.8 | $ 14.6
Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Period that contracts in transit are outstanding | 5 days |
Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Period that contracts in transit are outstanding | 10 days |

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