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Goodwill and Intangible Assets, Net (Goodwill) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Goodwill [Roll Forward] |  |  |
Goodwill, gross, beginning balance |  | $ 3,248.4 | $ 3,163.6
Goodwill, Impaired, Accumulated Impairment Loss |  | (1,928.3) | (1,928.3)
Goodwill, beginning balance |  | 1,320.1 | 1,235.3
Acquisitions, dispositions, and other adjustments, net | [1] | 145.7 | 84.8
Goodwill, gross, ending balance |  | 3,394.1 | 3,248.4
Goodwill, Impaired, Accumulated Impairment Loss |  | (1,928.3) | (1,928.3)
Goodwill, ending balance |  | 1,465.8 | 1,320.1
Reporting Unit, Domestic [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, gross, beginning balance |  | 376.3 | 368.7
Goodwill, Impaired, Accumulated Impairment Loss |  | (140.0) | (140.0)
Goodwill, beginning balance |  | 236.3 | 228.7
Acquisitions, dispositions, and other adjustments, net | [1] | (1.8) | 7.6
Goodwill, gross, ending balance |  | 374.5 | 376.3
Goodwill, Impaired, Accumulated Impairment Loss |  | (140.0) | (140.0)
Goodwill, ending balance |  | 234.5 | 236.3
Reporting Unit, Import [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, gross, beginning balance |  | 518.7 | 517.9
Goodwill, Impaired, Accumulated Impairment Loss |  | 0.0 | 0.0
Goodwill, beginning balance |  | 518.7 | 517.9
Acquisitions, dispositions, and other adjustments, net | [1] | 7.9 | 0.8
Goodwill, gross, ending balance |  | 526.6 | 518.7
Goodwill, Impaired, Accumulated Impairment Loss |  | 0.0 | 0.0
Goodwill, ending balance |  | 526.6 | 518.7
Reporting Unit, Premium Luxury [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, gross, beginning balance |  | 739.5 | 741.5
Goodwill, Impaired, Accumulated Impairment Loss |  | (257.4) | (257.4)
Goodwill, beginning balance |  | 482.1 | 484.1
Acquisitions, dispositions, and other adjustments, net | [1] | 0.0 | (2.0)
Goodwill, gross, ending balance |  | 739.5 | 739.5
Goodwill, Impaired, Accumulated Impairment Loss |  | (257.4) | (257.4)
Goodwill, ending balance |  | 482.1 | 482.1
Reporting Unit, Other |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, gross, beginning balance | [2] | 1,613.9 | 1,535.5
Goodwill, Impaired, Accumulated Impairment Loss | [2] | (1,530.9) | (1,530.9)
Goodwill, beginning balance |  | 83.0 | 4.6
Acquisitions, dispositions, and other adjustments, net | [1] | 139.6 | 78.4
Goodwill, gross, ending balance | [2] | 1,753.5 | 1,613.9
Goodwill, Impaired, Accumulated Impairment Loss | [2] | (1,530.9) | (1,530.9)
Goodwill, ending balance |  | 222.6 | 83.0
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). Gross goodwill balance reflected in “Other” also includes amounts associated with the Collision Center, Parts Center, AutoNation Finance and AutoNation Mobile Service reporting units, as applicable in a given period.

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