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Goodwill and Franchise Value (Schedule of Goodwill) (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2008
Goodwill [Roll Forward] |  |  |
Balance | $ 434.9 | $ 256.3 |
Adjustments to purchase price allocations | 5.1 |  |
Additions through acquisitions | 17.4 | 180.7 |
Reductions through divestitures | (0.6) | (2.1) |
Balance | 456.8 | 434.9 |
Accumulated impairment loss |  |  | $ 299.3
Goodwill acquired including purchase accounting adjustments | 22.5 |  |
Domestic |  |  |
Goodwill [Roll Forward] |  |  |
Balance | 164.5 | 114.0 |
Adjustments to purchase price allocations | 1.6 |  |
Additions through acquisitions | 6.2 | 51.4 |
Reductions through divestitures | (0.1) | (0.9) |
Balance | 172.2 | 164.5 |
Import |  |  |
Goodwill [Roll Forward] |  |  |
Balance | 188.9 | 104.3 |
Adjustments to purchase price allocations | 1.6 |  |
Additions through acquisitions | 9.0 | 85.8 |
Reductions through divestitures | (0.5) | (1.2) |
Balance | 199.0 | 188.9 |
Luxury |  |  |
Goodwill [Roll Forward] |  |  |
Balance | 81.5 | 38.0 |
Adjustments to purchase price allocations | 1.9 |  |
Additions through acquisitions | 2.2 | 43.5 |
Reductions through divestitures | 0.0 | 0.0 |
Balance | $ 85.6 | $ 81.5 |

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