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Goodwill and Intangible Assets, Net (Goodwill) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Goodwill [Roll Forward] |  |  |  |
Goodwill, gross, beginning balance |  | $ 3,113,300,000 | $ 3,111,900,000 |
Goodwill, Impaired, Accumulated Impairment Loss |  | (1,928,300,000) | (1,610,000,000) |
Goodwill, beginning balance |  | 1,185,000,000 | 1,501,900,000 |
Acquisitions, dispositions, and other adjustments, net | [1] | 50,300,000 | 1,400,000 |
Gain/(Loss) on goodwill impairment |  | 0 | (318,300,000) | $ 0
Goodwill, gross, ending balance |  | 3,163,600,000 | 3,113,300,000 | 3,111,900,000
Goodwill, Impaired, Accumulated Impairment Loss |  | (1,928,300,000) | (1,928,300,000) | (1,610,000,000)
Goodwill, ending balance |  | 1,235,300,000 | 1,185,000,000 | 1,501,900,000
Reporting Unit, Domestic [Member] |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, gross, beginning balance |  | 367,200,000 | 367,300,000 |
Goodwill, Impaired, Accumulated Impairment Loss |  | (140,000,000.0) | (140,000,000.0) |
Goodwill, beginning balance |  | 227,200,000 | 227,300,000 |
Acquisitions, dispositions, and other adjustments, net | [1] | 1,500,000 | (100,000) |
Gain/(Loss) on goodwill impairment |  |  | 0 |
Goodwill, gross, ending balance |  | 368,700,000 | 367,200,000 | 367,300,000
Goodwill, Impaired, Accumulated Impairment Loss |  | (140,000,000.0) | (140,000,000.0) | (140,000,000.0)
Goodwill, ending balance |  | 228,700,000 | 227,200,000 | 227,300,000
Reporting Unit, Import [Member] |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, gross, beginning balance |  | 500,600,000 | 498,900,000 |
Goodwill, Impaired, Accumulated Impairment Loss |  | 0 | 0 |
Goodwill, beginning balance |  | 500,600,000 | 498,900,000 |
Acquisitions, dispositions, and other adjustments, net | [1] | 17,300,000 | 1,700,000 |
Gain/(Loss) on goodwill impairment |  |  | 0 |
Goodwill, gross, ending balance |  | 517,900,000 | 500,600,000 | 498,900,000
Goodwill, Impaired, Accumulated Impairment Loss |  | 0 | 0 | 0
Goodwill, ending balance |  | 517,900,000 | 500,600,000 | 498,900,000
Reporting Unit, Premium Luxury [Member] |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, gross, beginning balance |  | 714,600,000 | 714,900,000 |
Goodwill, Impaired, Accumulated Impairment Loss |  | (257,400,000) | 0 |
Goodwill, beginning balance |  | 457,200,000 | 714,900,000 |
Acquisitions, dispositions, and other adjustments, net | [1] | 26,900,000 | (300,000) |
Gain/(Loss) on goodwill impairment |  |  | (257,400,000) |
Goodwill, gross, ending balance |  | 741,500,000 | 714,600,000 | 714,900,000
Goodwill, Impaired, Accumulated Impairment Loss |  | (257,400,000) | (257,400,000) | 0
Goodwill, ending balance |  | 484,100,000 | 457,200,000 | 714,900,000
Reporting Unit, Collision Centers [Member] |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, gross, beginning balance |  | 41,600,000 | 41,700,000 |
Goodwill, Impaired, Accumulated Impairment Loss |  | (41,600,000) | 0 |
Goodwill, beginning balance |  | 0 | 41,700,000 |
Acquisitions, dispositions, and other adjustments, net | [1] | 4,600,000 | (100,000) |
Gain/(Loss) on goodwill impairment |  |  | (41,600,000) |
Goodwill, gross, ending balance |  | 46,200,000 | 41,600,000 | 41,700,000
Goodwill, Impaired, Accumulated Impairment Loss |  | (41,600,000) | (41,600,000) | 0
Goodwill, ending balance |  | 4,600,000 | 0 | 41,700,000
Reporting Unit, Parts Centers [Member] |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, gross, beginning balance |  | 19,300,000 | 19,100,000 |
Goodwill, Impaired, Accumulated Impairment Loss |  | (19,300,000) | 0 |
Goodwill, beginning balance |  | 0 | 19,100,000 |
Acquisitions, dispositions, and other adjustments, net | [1] | 0 | 200,000 |
Gain/(Loss) on goodwill impairment |  |  | (19,300,000) |
Goodwill, gross, ending balance |  | 19,300,000 | 19,300,000 | 19,100,000
Goodwill, Impaired, Accumulated Impairment Loss |  | (19,300,000) | (19,300,000) | 0
Goodwill, ending balance |  | 0 | 0 | 19,100,000
Single Reporting Unit (before change in reporting units) |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill, gross, beginning balance |  | 1,470,000,000 | 1,470,000,000 |
Goodwill, Impaired, Accumulated Impairment Loss |  | (1,470,000,000) | (1,470,000,000) |
Goodwill, beginning balance |  | 0 | 0 |
Acquisitions, dispositions, and other adjustments, net | [1] | 0 | 0 |
Gain/(Loss) on goodwill impairment |  |  | 0 |
Goodwill, gross, ending balance |  | 1,470,000,000 | 1,470,000,000 | 1,470,000,000
Goodwill, Impaired, Accumulated Impairment Loss |  | (1,470,000,000) | (1,470,000,000) | (1,470,000,000)
Goodwill, ending balance |  | $ 0 | $ 0 | $ 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.

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