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Goodwill And Intangible Assets, Net (Goodwill Allocated to Reporting Units and Changes in Fair Value (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, beginning balance |  |  | $ 1,501.9 |  |
Acquisitions, dispositions, and other adjustments, net |  |  | 2.9 |  |
Impairment | $ 0.0 | $ 0.0 | (318.3) | $ 0.0 |
Goodwill, ending balance | 1,186.5 |  | 1,186.5 |  |
Accumulated impairment loss | 1,470.0 |  | 1,470.0 |  | $ 1,470.0
Reporting Unit, Domestic [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, beginning balance |  |  | 227.3 |  |
Acquisitions, dispositions, and other adjustments, net |  |  | (0.1) |  |
Impairment |  |  | 0.0 |  |
Goodwill, ending balance | 227.2 |  | 227.2 |  |
Accumulated impairment loss | 140.0 |  | 140.0 |  | $ 140.0
Reporting Unit, Import [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, beginning balance |  |  | 498.9 |  |
Acquisitions, dispositions, and other adjustments, net |  |  | 3.2 |  |
Impairment |  |  | 0.0 |  |
Goodwill, ending balance | 502.1 |  | 502.1 |  |
Reporting Unit, Premium Luxury [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, beginning balance |  |  | 714.9 |  |
Acquisitions, dispositions, and other adjustments, net |  |  | (0.3) |  |
Impairment |  |  | (257.4) |  |
Goodwill, ending balance | 457.2 |  | 457.2 |  |
Accumulated impairment loss | 257.4 |  | 257.4 |  |
Reporting Unit, Collision Centers [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, beginning balance |  |  | 41.7 |  |
Acquisitions, dispositions, and other adjustments, net |  |  | (0.1) |  |
Impairment |  |  | (41.6) |  |
Goodwill, ending balance | 0.0 |  | 0.0 |  |
Accumulated impairment loss | 41.6 |  | 41.6 |  |
Reporting Unit, Parts Centers [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, beginning balance |  |  | 19.1 |  |
Acquisitions, dispositions, and other adjustments, net |  |  | 0.2 |  |
Impairment |  |  | (19.3) |  |
Goodwill, ending balance | 0.0 |  | 0.0 |  |
Accumulated impairment loss | $ 19.3 |  | $ 19.3 |  |

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