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Acquisitions and Dispositions (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) | Dec. 31, 2018 franchise | Dec. 31, 2018 USD ($) | Dec. 31, 2018 dealership | Dec. 31, 2017 USD ($) franchise dealership | Dec. 31, 2016 franchise | Dec. 31, 2016 USD ($) | Dec. 31, 2016 dealership
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of franchises awarded |  | 1 |  |  |  |  |  |
Number of dealerships opened | dealership |  |  |  | 1 |  |  |  |
Aggregate consideration paid for dealerships | $ |  |  | $ 140.4 |  | $ 120.3 |  | $ 61.2 |
Cash received in acquisition | $ |  |  |  |  | $ 11.2 |  | 3.9 |
Number of dealerships disposed |  |  |  |  | 3 |  |  |
Number of franchises disposed |  |  |  |  |  | 10 |  |
Pretax gain on disposal | $ |  |  | 24.4 |  |  |  |  |
Net pre-tax gain (loss) on dealership dispositions | $ | $ 20.2 |  |  |  |  |  |  |
U.K. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of dealerships acquired | dealership |  |  |  | 5 | 12 |  |  | 12
Number of franchises acquired |  | 8 |  |  | 14 | 15 |  |
Number of franchises awarded |  | 1 |  |  | 1 | 2 |  |
Number of dealerships opened | dealership |  |  |  | 1 | 1 |  |  | 2
Cash received in acquisition | $ |  |  | $ 5.1 |  |  |  |  |
Number of dealerships disposed | dealership |  |  |  |  | 1 |  |  |
Number of franchises disposed |  | 1 |  | 1 | 1 | 1 |  |
Number of franchises terminated |  | 1 |  |  |  |  |  |
Net pre-tax gain (loss) on dealership dispositions | $ |  |  |  |  |  |  | (0.3) |
U.S. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of dealerships acquired | dealership |  |  |  | 4 | 3 |  |  |
Number of franchises acquired |  | 4 |  |  | 4 |  |  |
Number of franchises awarded |  | 1 |  |  | 1 |  |  |
Number of dealerships opened | dealership |  |  |  | 1 | 1 |  |  |
Number of dealerships disposed | dealership |  |  |  | 2 |  |  |  |
Number of franchises disposed |  | 3 |  |  |  | 5 |  |
Net pre-tax gain (loss) on dealership dispositions | $ |  |  |  |  |  |  | 2.7 |
Brazil |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of dealerships acquired |  |  |  | 1 |  | 1 |  | 1
Number of franchises acquired |  | 1 |  |  |  | 2 |  |
Number of franchises awarded |  |  |  |  |  | 2 |  |
Number of dealerships opened | dealership |  |  |  |  |  |  |  | 2
Number of dealerships disposed | dealership |  |  |  |  | 2 |  |  |
Number of franchises disposed |  |  |  |  | 2 | 4 |  |
Net pre-tax gain (loss) on dealership dispositions | $ |  |  |  |  |  |  | $ (0.8) |

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