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Goodwill and Franchise Value (Schedule of Goodwill) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2008
Goodwill [Roll Forward] |  |  |
Beginning balance | $ 593.0 | $ 454.6 |
Additions through acquisitions | 24.5 | 144.9 |
Reductions through divestitures |  | (3.0) |
Reductions from impairments |  | (3.5) |
Ending balance | 617.5 | 593.0 |
Accumulated impairment loss |  |  | $ 299.3
Domestic |  |  |
Goodwill [Roll Forward] |  |  |
Beginning balance | 204.5 | 171.8 |
Additions through acquisitions | 5.5 | 33.3 |
Reductions through divestitures |  | (0.1) |
Reductions from impairments |  | (0.5) |
Ending balance | 210.0 | 204.5 |
Import |  |  |
Goodwill [Roll Forward] |  |  |
Beginning balance | 287.9 | 197.3 |
Additions through acquisitions | 10.7 | 94.3 |
Reductions through divestitures |  | (0.7) |
Reductions from impairments |  | (3.0) |
Ending balance | 298.6 | 287.9 |
Luxury |  |  |
Goodwill [Roll Forward] |  |  |
Beginning balance | 100.6 | 85.5 |
Additions through acquisitions | 8.3 | 17.3 |
Reductions through divestitures |  | (2.2) |
Reductions from impairments |  | 0.0 |
Ending balance | $ 108.9 | $ 100.6 |

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