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Summary of Significant Accounting Policies - Narrative (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) brand segment store state | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jun. 25, 2018 financial_institution finance_companies | Jan. 01, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Number of stores | store | 182 |  |  |  |
Number of new vehicle brands | brand | 28 |  |  |  |
Number of states | state | 18 |  |  |  |
Threshold period for interest to bear on receivables | 60 days |  |  |  |
Interest costs capitalized | $ (1.3) | $ (0.5) | $ (0.4) |  |
Adjustment to adopt new accounting principles |  | 1.4 |  |  |
Reclassification to operating cash flows | 519.7 | 148.9 | 90.9 |  |
Reclassification from financing cash flows | 11.7 | 396.3 | 266.1 |  |
Long-term debt, outstanding amount | 2,700.0 |  |  |  |
Accrued warranty balance | 0.5 | 0.4 |  |  |
Contract liability | 149.6 | 126.1 |  |  |
Contract liability, revenue recognized | 21.9 |  |  |  |
Contract asset | $ 9.2 |  |  |  | $ 9.2
Number of reportable segments | segment | 3 |  |  |  |
Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Period that contracts in transit are outstanding | 5 days |  |  |  |
Long-term debt, variable interest rate (in percent) | 3.77% |  |  |  |
Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Period that contracts in transit are outstanding | 10 days |  |  |  |
Long-term debt, variable interest rate (in percent) | 6.75% |  |  |  |
Accounting Standards Update 2016-09 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Reclassification to operating cash flows |  |  | 4.4 |  |
Reclassification from financing cash flows |  |  | (4.4) |  |
Tax-affected state net operating loss carryforwards |  | 0.3 |  |  |
Credit Facility | Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Number of financial institutions | financial_institution |  |  |  | 20 |
Number of manufacturer affiliated finance companies | finance_companies |  |  |  | 7 |
Additional Paid-In Capital |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Adjustment to adopt new accounting principles |  |  | (0.2) |  |
Additional Paid-In Capital | Accounting Standards Update 2016-09 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Adjustment to adopt new accounting principles |  | (0.2) |  |  |
Retained Earnings |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Adjustment to adopt new accounting principles |  | 1.4 | $ 0.2 |  |
Retained Earnings | Accounting Standards Update 2016-09 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Adjustment to adopt new accounting principles |  | $ 0.2 |  |  |

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