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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.