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Goodwill and Intangible Assets, Net (Goodwill) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, gross, beginning balance |  |  |  | $ 3,381.2 |
Accumulated impairment losses, beginning balance |  |  |  | (1,928.3) |
Goodwill, beginning balance |  |  |  | 1,452.9 |
Acquisitions, dispositions, and other adjustments, net | [1] |  |  | 11.9 |
Impairment |  | $ 0.0 | $ 0.0 | (65.3) | $ 0.0
Goodwill, gross, ending balance |  | 3,393.1 |  | 3,393.1 |
Accumulated impairment losses, ending balance |  | (1,993.6) |  | (1,993.6) |
Goodwill, ending balance |  | 1,399.5 |  | 1,399.5 |
Reporting Unit, Domestic |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, gross, beginning balance |  |  |  | 363.4 |
Accumulated impairment losses, beginning balance |  |  |  | (140.0) |
Goodwill, beginning balance |  |  |  | 223.4 |
Acquisitions, dispositions, and other adjustments, net | [1] |  |  | (1.5) |
Impairment |  |  |  | 0.0 |
Goodwill, gross, ending balance |  | 361.9 |  | 361.9 |
Accumulated impairment losses, ending balance |  | (140.0) |  | (140.0) |
Goodwill, ending balance |  | 221.9 |  | 221.9 |
Reporting Unit, Import |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, gross, beginning balance |  |  |  | 524.3 |
Accumulated impairment losses, beginning balance |  |  |  | 0.0 |
Goodwill, beginning balance |  |  |  | 524.3 |
Acquisitions, dispositions, and other adjustments, net | [1] |  |  | (0.9) |
Impairment |  |  |  | 0.0 |
Goodwill, gross, ending balance |  | 523.4 |  | 523.4 |
Accumulated impairment losses, ending balance |  | 0.0 |  | 0.0 |
Goodwill, ending balance |  | 523.4 |  | 523.4 |
Reporting Unit, Premium Luxury |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, gross, beginning balance |  |  |  | 739.1 |
Accumulated impairment losses, beginning balance |  |  |  | (257.4) |
Goodwill, beginning balance |  |  |  | 481.7 |
Acquisitions, dispositions, and other adjustments, net | [1] |  |  | 14.3 |
Impairment |  |  |  | 0.0 |
Goodwill, gross, ending balance |  | 753.4 |  | 753.4 |
Accumulated impairment losses, ending balance |  | (257.4) |  | (257.4) |
Goodwill, ending balance |  | 496.0 |  | 496.0 |
Reporting Unit, AN Finance |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, gross, beginning balance |  |  |  | 78.4 |
Accumulated impairment losses, beginning balance |  |  |  | 0.0 |
Goodwill, beginning balance |  |  |  | 78.4 |
Acquisitions, dispositions, and other adjustments, net | [1] |  |  | 0.0 |
Impairment |  |  |  | 0.0 |
Goodwill, gross, ending balance |  | 78.4 |  | 78.4 |
Accumulated impairment losses, ending balance |  | 0.0 |  | 0.0 |
Goodwill, ending balance |  | 78.4 |  | 78.4 |
Reporting Unit, Other |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, gross, beginning balance | [2] |  |  | 1,676.0 |
Accumulated impairment losses, beginning balance | [2] |  |  | (1,530.9) |
Goodwill, beginning balance |  |  |  | 145.1 |
Acquisitions, dispositions, and other adjustments, net | [1] |  |  | 0.0 |
Impairment |  |  |  | (65.3) |
Goodwill, gross, ending balance | [2] | 1,676.0 |  | 1,676.0 |
Accumulated impairment losses, ending balance | [2] | (1,596.2) |  | (1,596.2) |
Goodwill, ending balance |  | 79.8 |  | 79.8 |
Single Reporting Unit (before change in reporting units) |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Accumulated impairment losses, ending balance |  | $ (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 Sheets 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, and AutoNation Mobile Service reporting units, as applicable in a given period.

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