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Segment Information - Summary of Reportable Operating Segment (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) Segment | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Operating income (loss) | $ 538,400,000 | $ 33,900,000 | $ 307,700,000 |
Interest expense, other, net | (48,000,000.0) | (41,600,000) | (53,000,000.0) |
Other income (expense), net | (15,500,000) | 100,000 | (6,600,000) |
Income (loss) from continuing operations before taxes | 458,200,000 | (34,800,000) | 199,600,000 |
Segment Schedule Footnotes |  |  |  |
Asset impairment charges | 100,000 | 270,000,000.0 | 20,800,000 |
Executive transition costs |  |  | 6,300,000 |
Nonrecurring Compensation Expense | 6,500,000 |  |  |
Total floor plan interest expense | 16,700,000 | 27,200,000 | 48,500,000 |
Depreciation, Depletion and Amortization, Nonproduction | 101,100,000 | 91,000,000.0 | 93,100,000 |
Total assets | 4,975,100,000 | 3,746,000,000 |  |
Cash and cash equivalents | 299,400,000 | 170,300,000 | 29,100,000 | $ 5,900,000
Goodwill | 416,400,000 | 214,000,000.0 | 475,800,000 |
Intangible Assets, Net (Excluding Goodwill) | 480,200,000 | 64,300,000 |  |
Other corporate assets | $ 200,000 | 0 |  |
Number of operating segments | Segment | 2 |  |  |
Segment Income | $ 458,300,000 | 235,200,000 | 220,400,000 |
EchoPark Segment Income | (72,000,000.0) | 4,000,000.0 | 9,100,000 |
Segment Retail Units Sold |  |  |  |
Franchised Dealerships New Vehicle Revenue | 5,109,000,000 | 4,281,200,000 | 4,889,200,000 |
Franchised Dealerships Used Vehicle Revenue | 2,901,000,000 | 2,345,900,000 | 2,493,500,000 |
Franchised Dealerships Wholesale Revenue | 257,200,000 | 168,700,000 | 180,000,000.0 |
Franchised Dealerships Fixed Ops Revenue | 1,340,400,000 | 1,194,400,000 | 1,366,500,000 |
Franchised Dealerships F&I Revenue | 443,500,000 | 357,800,000 | 363,100,000 |
Franchised Dealerships Segment Revenue | 10,051,100,000 | 8,348,000,000 | 9,292,300,000 |
EchoPark New Vehicle Revenue | 9,000,000.0 | 0 | 0 |
EchoPark Used Vehicle Revenue | 2,032,600,000 | 1,258,200,000 | 1,025,300,000 |
EchoPark Wholesale Revenue | 110,000,000.0 | 28,700,000 | 22,900,000 |
EchoPark F&I Revenue | 193,700,000 | 132,100,000 | 113,800,000 |
EchoPark Segment Revenue | 2,345,300,000 | 1,419,000,000 | 1,162,000,000 |
Total revenues | 12,396,400,000 | 9,767,000,000 | 10,454,300,000 |
EchoPark Total Impairment [Member] |  |  |  |
Segment Schedule Footnotes |  |  |  |
Asset impairment charges | 100,000 | 0 | 19,700,000 |
Franchised Dealership Impairment [Member] |  |  |  |
Segment Schedule Footnotes |  |  |  |
Asset impairment charges | $ 0 |  | 1,100,000 |
Franchised Dealerships [Member] |  |  |  |
Segment Schedule Footnotes |  |  |  |
Asset impairment charges |  | $ 270,000,000.0 |  |
PreOwnedStoreMember [Member] |  |  |  |
Segment Schedule Footnotes |  |  |  |
Asset impairment charges |  |  | 19,700,000 |
Operating segments | Income (loss) from continuing operations before taxes | Franchised Dealership Impairment [Member] |  |  |  |
Segment Schedule Footnotes |  |  |  |
Asset impairment charges |  |  | $ 270,000,000 |

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