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Goodwill And Intangible Assets, Net (Details) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 USD ($) store | Mar. 31, 2019 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill | [1] | $ 1,183.6 | [2] |  | $ 1,183.6 | [2] | $ 1,501.9
Franchise rights - indefinite-lived |  |  |  |  | 509.0 |  | 566.5
Other intangibles |  |  |  |  | 21.2 |  | 23.4
Other intangible assets, gross |  |  |  |  | 530.2 |  | 589.9
Less: accumulated amortization |  |  |  |  | (7.9) |  | (8.3)
Other intangible assets, net |  |  |  |  | 522.3 |  | 581.6
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill, beginning balance | [1] | 1,501.9 |  |  |  |  |
Acquisitions, dispositions, and other adjustments, net | [3] | 0.0 |  |  |  |  |
Impairment |  | (318.3) |  | $ 0.0 |  |  |
Goodwill, ending balance | [1],[2] | $ 1,183.6 |  |  |  |  |
Accumulated impairment loss |  |  |  |  | 1,470.0 |  | 1,470.0
Franchise rights impairment, number of stores | store |  | 8 |  |  |  |  |
Franchise rights impairment |  | $ 57.5 |  | $ 0.0 |  |  |
Reporting Unit, Domestic [Member] |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill | [1] | 227.3 | [2] |  | 227.3 | [2] | 227.3
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill, beginning balance | [1] | 227.3 |  |  |  |  |
Acquisitions, dispositions, and other adjustments, net | [3] | 0.0 |  |  |  |  |
Impairment |  | 0.0 |  |  |  |  |
Goodwill, ending balance | [1],[2] | 227.3 |  |  |  |  |
Accumulated impairment loss |  |  |  |  | 140.0 |  | 140.0
Reporting Unit, Import [Member] |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill | [1] | 498.8 | [2] |  | 498.8 | [2] | 498.9
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill, beginning balance | [1] | 498.9 |  |  |  |  |
Acquisitions, dispositions, and other adjustments, net | [3] | (0.1) |  |  |  |  |
Impairment |  | 0.0 |  |  |  |  |
Goodwill, ending balance | [1],[2] | 498.8 |  |  |  |  |
Reporting Unit, Premium Luxury [Member] |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill | [1] | 457.5 | [2] |  | 457.5 | [2] | 714.9
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill, beginning balance | [1] | 714.9 |  |  |  |  |
Acquisitions, dispositions, and other adjustments, net | [3] | 0.0 |  |  |  |  |
Impairment |  | (257.4) |  |  |  |  |
Goodwill, ending balance | [1],[2] | 457.5 |  |  |  |  |
Accumulated impairment loss |  |  |  |  | 257.4 |  |
Reporting Unit, Collision Centers [Member] |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill | [1] | 0.0 | [2] |  | 0.0 | [2] | 41.7
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill, beginning balance | [1] | 41.7 |  |  |  |  |
Acquisitions, dispositions, and other adjustments, net | [3] | (0.1) |  |  |  |  |
Impairment |  | (41.6) |  |  |  |  |
Goodwill, ending balance | [1],[2] | 0.0 |  |  |  |  |
Accumulated impairment loss |  |  |  |  | 41.6 |  |
Reporting Unit, Parts Centers [Member] |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill | [1] | 0.0 | [2] |  | 0.0 | [2] | $ 19.1
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill, beginning balance | [1] | 19.1 |  |  |  |  |
Acquisitions, dispositions, and other adjustments, net | [3] | 0.2 |  |  |  |  |
Impairment |  | (19.3) |  |  |  |  |
Goodwill, ending balance | [1],[2] | 0.0 |  |  |  |  |
Accumulated impairment loss |  |  |  |  | $ 19.3 |  |
Franchise Rights [Member] |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Franchise rights impairment |  | $ 57.5 |  |  |  |  |
[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] | 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.
[3] | Includes amounts reclassified to held for sale and related adjustments, which are presented in Other Current Assets in our Consolidated Balance Sheet as of period end.

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