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Store Divestitures (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2019 USD ($) store | Dec. 31, 2018 USD ($) store | Dec. 31, 2017 USD ($) store
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Gain on disposal | $ |  | $ 29.7 | $ 40.3 | $ 78.2
Write-downs associated with pending business divestitures | $ | $ 26.2 |  |  |
Domestic Stores Divested [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Number of businesses divested |  | 3 | 8 | 2
Import Stores Divested [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Number of businesses divested |  | 5 | 7 | 4
Premium Luxury Stores Divested [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Number of businesses divested |  |  | 2 |
Collision Centers Divested [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Number of businesses divested |  | 2 | 1 |

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