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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 | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill, beginning balance | [1] |  |  | $ 1,501.9 |  |
Acquisitions, dispositions, and other adjustments, net | [2] |  |  | (2.3) |  |
Impairment |  | $ 0.0 | $ 0.0 | (318.3) | $ 0.0 |
Goodwill, ending balance | [1],[3] | 1,181.3 |  | 1,181.3 |  |
Accumulated impairment loss |  | 1,470.0 |  | 1,470.0 |  | $ 1,470.0
Reporting Unit, Domestic [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill, beginning balance | [1] |  |  | 227.3 |  |
Acquisitions, dispositions, and other adjustments, net | [2] |  |  | (0.1) |  |
Impairment |  |  |  | 0.0 |  |
Goodwill, ending balance | [1],[3] | 227.2 |  | 227.2 |  |
Accumulated impairment loss |  | 140.0 |  | 140.0 |  | $ 140.0
Reporting Unit, Import [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill, beginning balance | [1] |  |  | 498.9 |  |
Acquisitions, dispositions, and other adjustments, net | [2] |  |  | (2.0) |  |
Impairment |  |  |  | 0.0 |  |
Goodwill, ending balance | [1],[3] | 496.9 |  | 496.9 |  |
Reporting Unit, Premium Luxury [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill, beginning balance | [1] |  |  | 714.9 |  |
Acquisitions, dispositions, and other adjustments, net | [2] |  |  | (0.3) |  |
Impairment |  |  |  | (257.4) |  |
Goodwill, ending balance | [1],[3] | 457.2 |  | 457.2 |  |
Accumulated impairment loss |  | 257.4 |  | 257.4 |  |
Reporting Unit, Collision Centers [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill, beginning balance | [1] |  |  | 41.7 |  |
Acquisitions, dispositions, and other adjustments, net | [2] |  |  | (0.1) |  |
Impairment |  |  |  | (41.6) |  |
Goodwill, ending balance | [1],[3] | 0.0 |  | 0.0 |  |
Accumulated impairment loss |  | 41.6 |  | 41.6 |  |
Reporting Unit, Parts Centers [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill, beginning balance | [1] |  |  | 19.1 |  |
Acquisitions, dispositions, and other adjustments, net | [2] |  |  | 0.2 |  |
Impairment |  |  |  | (19.3) |  |
Goodwill, ending balance | [1],[3] | 0.0 |  | 0.0 |  |
Accumulated impairment loss |  | $ 19.3 |  | $ 19.3 |  |
[1] | Net of accumulated impairment losses of $1.47 billion associated with our single reporting unit (prior to September 30, 2008, our reporting unit structure was comprised of a single reporting unit) and $140.0 million associated with our Domestic reporting unit, both of which were recorded during the year ended December 31, 2008.
[2] | Includes amounts reclassified to held for sale and related adjustments, which are presented in Other Current Assets in our Unaudited Condensed Consolidated Balance Sheet as of period end.
[3] | Net of accumulated impairment losses of $257.4 million associated with our Premium Luxury reporting unit, $41.6 million associated with our Collision Centers reporting unit, and $19.3 million associated with our Parts Centers reporting unit, each of which were recorded during the three months ended March 31, 2020.

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