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Goodwill and Intangible Assets, Net (Goodwill) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Goodwill [Roll Forward] |  |  |  |
Goodwill, gross, beginning balance |  | $ 3,163.6 |  | $ 3,113.3
Goodwill, Impaired, Accumulated Impairment Loss |  | (1,928.3) |  | (1,928.3)
Goodwill, beginning balance |  | 1,235.3 |  | 1,185.0
Acquisitions, dispositions, and other adjustments, net | [1] | 84.8 |  | 50.3
Goodwill, gross, ending balance |  | 3,248.4 |  | 3,163.6
Goodwill, Impaired, Accumulated Impairment Loss |  | (1,928.3) |  | (1,928.3)
Goodwill, ending balance |  | 1,320.1 |  | 1,235.3
Reporting Unit, Domestic [Member] |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, gross, beginning balance |  | 368.7 |  | 367.2
Goodwill, Impaired, Accumulated Impairment Loss |  | (140.0) |  | (140.0)
Goodwill, beginning balance |  | 228.7 |  | 227.2
Acquisitions, dispositions, and other adjustments, net | [1] | 7.6 |  | 1.5
Goodwill, gross, ending balance |  | 376.3 |  | 368.7
Goodwill, Impaired, Accumulated Impairment Loss |  | (140.0) |  | (140.0)
Goodwill, ending balance |  | 236.3 |  | 228.7
Reporting Unit, Import [Member] |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, gross, beginning balance |  | 517.9 |  | 500.6
Goodwill, Impaired, Accumulated Impairment Loss |  | 0.0 |  | 0.0
Goodwill, beginning balance |  | 517.9 |  | 500.6
Acquisitions, dispositions, and other adjustments, net | [1] | 0.8 |  | 17.3
Goodwill, gross, ending balance |  | 518.7 |  | 517.9
Goodwill, Impaired, Accumulated Impairment Loss |  | 0.0 |  | 0.0
Goodwill, ending balance |  | 518.7 |  | 517.9
Reporting Unit, Premium Luxury [Member] |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, gross, beginning balance |  | 741.5 |  | 714.6
Goodwill, Impaired, Accumulated Impairment Loss |  | (257.4) |  | (257.4)
Goodwill, beginning balance |  | 484.1 |  | 457.2
Acquisitions, dispositions, and other adjustments, net | [1] | (2.0) |  | 26.9
Goodwill, gross, ending balance |  | 739.5 |  | 741.5
Goodwill, Impaired, Accumulated Impairment Loss |  | (257.4) |  | (257.4)
Goodwill, ending balance |  | 482.1 |  | 484.1
Reporting Unit, Other |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, gross, beginning balance | [2] | 1,535.5 |  | 1,530.9
Goodwill, Impaired, Accumulated Impairment Loss | [2] | (1,530.9) |  | (1,530.9)
Goodwill, beginning balance |  | 4.6 |  | 0.0
Acquisitions, dispositions, and other adjustments, net | [1] | 78.4 |  | 4.6
Goodwill, gross, ending balance | [2] | 1,613.9 | [3] | 1,535.5
Goodwill, Impaired, Accumulated Impairment Loss | [2] | (1,530.9) |  | (1,530.9)
Goodwill, ending balance |  | 83.0 |  | 4.6
Single Reporting Unit (before change in reporting units) |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss |  | (1,470.0) |  | (1,470.0)
Goodwill, Impaired, Accumulated Impairment Loss |  | $ (1,470.0) |  | $ (1,470.0)
[1] | 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.
[2] | Gross goodwill balance and accumulated impairment losses reflected in “Other” include$1.47 billion associated with our single reporting unit (prior to September 30, 2008, our reporting unit reporting structure was comprised of a single reporting unit), as well as amounts associated with the Collision Center and Parts Center reporting units.
[3] | Gross goodwill balance reflected in “Other” includes amounts associated with the AutoNation Finance reporting unit

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