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Goodwill and Franchise Value - Goodwill (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2008
Goodwill [Roll Forward] |  |  |  |
Balance |  | $ 256.3 | $ 259.4 |
Adjustments to purchase price allocations | $ (2.2) |  | (2.2) |
Additions through acquisitions |  | 180.7 |  |
Reductions through divestitures |  | (2.1) | (0.9) |
Balance |  | 434.9 | 256.3 |
Accumulated impairment losses |  |  |  | $ 299.3
Domestic |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Balance |  | 114.0 | 114.8 |
Adjustments to purchase price allocations |  |  | (0.8) |
Additions through acquisitions |  | 51.4 |  |
Reductions through divestitures |  | (0.9) | 0.0 |
Balance |  | 164.5 | 114.0 |
Import |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Balance |  | 104.3 | 106.2 |
Adjustments to purchase price allocations |  |  | (1.0) |
Additions through acquisitions |  | 85.8 |  |
Reductions through divestitures |  | (1.2) | (0.9) |
Balance |  | 188.9 | 104.3 |
Luxury |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Balance |  | 38.0 | 38.4 |
Adjustments to purchase price allocations |  |  | (0.4) |
Additions through acquisitions |  | 43.5 |  |
Reductions through divestitures |  | 0.0 | 0.0 |
Balance |  | $ 81.5 | $ 38.0 |

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