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Business Combinations - Activity (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) item | Dec. 31, 2017 item
Business combinations |  |
Revenue from acquisition | $ | $ 484.7 |
Pre-tax income from acquisition | $ | $ 14.1 |
The Car People |  |
Business combinations |  |
Number of retail locations acquired | 4 |
CarSense |  |
Business combinations |  |
Number of retail locations acquired |  | 5
CarShop |  |
Business combinations |  |
Number of retail locations acquired |  | 5
Retail Automotive Dealership |  |
Business combinations |  |
Number of acquired franchises | 6 | 8
Retail Commercial Truck Dealership |  |
Business combinations |  |
Number of dealerships acquired | 1 |

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- Definition This element represents the amount of pre-tax income of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Represents the number of dealerships acquired. + References No definition available. + Details
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- Definition Number of franchises acquired. + References No definition available. + Details
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- Definition Represents the number of retail locations acquired. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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