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Store Divestiures (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2019 USD ($) store | Mar. 31, 2018 USD ($) store
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Gain on disposal | $ | $ 8.5 | $ 6.5
Domestic Stores Divested [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Number of stores divested |  | 7
Import Stores Divested [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Number of stores divested | 2 | 2
Premium Luxury Stores Divested [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Number of stores divested |  | 1
Collision Centers Divested [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Number of stores divested |  | 1

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