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Segment Information - Summary of Reportable Operating Segment (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Revenues: |  |  |  |  |  |
Total consolidated revenues | $ 3,643,500,000 | $ 3,448,100,000 | $ 10,787,600,000 | $ 10,410,500,000 |  |
Segment income (loss): |  |  |  |  |  |
Segment income (loss) | 137,400,000 | 148,900,000 | 322,100,000 | 458,100,000 |  |
Interest expense, other, net | (29,000,000.0) | (22,900,000) | (86,200,000) | (65,100,000) |  |
Other income (expense), net | 200,000 | 0 | 300,000 | 100,000 |  |
Income (loss) from continuing operations before taxes | 91,200,000 | 116,400,000 | 187,300,000 | 372,500,000 |  |
FloorPlanDepositBalance | 300,000,000.0 |  | 300,000,000.0 |  | $ 272,000,000.0 |
Impairment charges | 0 | 0 | (62,600,000) | 0 |  |
Impairment of Long-Lived Assets to be Disposed of |  |  | 32,500,000 |  |  |
Depreciation, Depletion and Amortization | 35,200,000 | 32,800,000 | 105,700,000 | 94,000,000.0 |  |
FloorPlanInterestExpense | 17,400,000 | 9,600,000 | 48,900,000 | 20,600,000 |  |
Interest Expense, Other | 29,000,000.0 | 22,900,000 | 86,200,000 | 65,100,000 |  |
Payments to Acquire Property, Plant, and Equipment | 78,100,000 | 97,300,000 | 153,600,000 | 197,600,000 |  |
Cash and cash equivalents | 34,600,000 | 139,000,000.0 | 34,600,000 | 139,000,000.0 | 229,200,000 | $ 299,400,000
Assets | 5,050,300,000 |  | 5,050,300,000 |  | 4,978,300,000 |
Powersports Used Vehicle Revenue | 4,900,000 | 2,000,000.0 | 17,100,000 | 5,000,000.0 |  |
Powersports Wholesale Vehicle Revenue | 1,300,000 | 0 | 1,900,000 | 300,000 |  |
Powersports Fixed Ops Revenue | 21,600,000 | 3,500,000 | 38,600,000 | 5,200,000 |  |
Powersports F&I Revenue | 2,400,000 | 900,000 | 5,900,000 | 1,400,000 |  |
Powersports Segment Revenue | 57,000,000.0 | 17,000,000.0 | 136,000,000.0 | 24,900,000 |  |
Franchised Dealerships Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 2,959,800,000 | 2,840,300,000 | 8,773,800,000 | 8,511,900,000 |  |
Segment income (loss): |  |  |  |  |  |
Interest expense, other, net | (27,900,000) | (21,400,000) | (82,200,000) | (61,700,000) |  |
Depreciation, Depletion and Amortization | 28,200,000 | 25,800,000 | 82,800,000 | 75,800,000 |  |
FloorPlanInterestExpense | 12,900,000 | 6,600,000 | 34,700,000 | 13,900,000 |  |
Interest Expense, Other | 27,900,000 | 21,400,000 | 82,200,000 | 61,700,000 |  |
Payments to Acquire Property, Plant, and Equipment | 72,100,000 | 43,800,000 | 137,300,000 | 95,800,000 |  |
Assets | 3,806,000,000 |  | 3,806,000,000 |  | 4,091,700,000 |
EchoPark Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 626,700,000 | 590,800,000 | 1,877,800,000 | 1,873,700,000 |  |
Segment income (loss): |  |  |  |  |  |
Interest expense, other, net | (700,000) | (1,100,000) | (2,500,000) | (3,000,000.0) |  |
Depreciation, Depletion and Amortization | 6,100,000 | 6,800,000 | 20,400,000 | 17,700,000 |  |
FloorPlanInterestExpense | 4,300,000 | 3,000,000.0 | 13,600,000 | 6,700,000 |  |
Interest Expense, Other | 700,000 | 1,100,000 | 2,500,000 | 3,000,000.0 |  |
Payments to Acquire Property, Plant, and Equipment | 5,400,000 | 53,500,000 | 14,100,000 | 101,800,000 |  |
Assets | 700,900,000 |  | 700,900,000 |  | 267,600,000 |
Powersports Segment |  |  |  |  |  |
Segment income (loss): |  |  |  |  |  |
Interest expense, other, net | (400,000) | (400,000) | (1,500,000) | (400,000) |  |
Depreciation, Depletion and Amortization | 900,000 | 200,000 | 2,500,000 | 500,000 |  |
FloorPlanInterestExpense | 200,000 | 0 | 600,000 | 0 |  |
Interest Expense, Other | 400,000 | 400,000 | 1,500,000 | 400,000 |  |
Payments to Acquire Property, Plant, and Equipment | 600,000 | 0 | 2,200,000 | 0 |  |
Assets | 208,800,000 |  | 208,800,000 |  | $ 117,800,000 |
Operating segments |  |  |  |  |  |
Segment income (loss): |  |  |  |  |  |
Segment income (loss) | 91,200,000 | 116,400,000 | 249,900,000 | 372,500,000 |  |
Operating segments | Franchised Dealerships Segment |  |  |  |  |  |
Segment income (loss): |  |  |  |  |  |
Segment income (loss) | 101,500,000 | 146,300,000 | 357,200,000 | 472,200,000 |  |
Operating segments | EchoPark Segment |  |  |  |  |  |
Segment income (loss): |  |  |  |  |  |
Segment income (loss) | (16,900,000) | (31,100,000) | (116,500,000) | (100,600,000) |  |
Operating segments | Powersports Segment |  |  |  |  |  |
Segment income (loss): |  |  |  |  |  |
Segment income (loss) | 6,600,000 | 1,200,000 | 9,200,000 | 900,000 |  |
Reconciling items |  |  |  |  |  |
Segment income (loss): |  |  |  |  |  |
Interest expense, other, net |  |  | (62,600,000) | 0 |  |
Other income (expense), net | 91,200,000 | 116,400,000 | 187,300,000 | 372,500,000 |  |
Impairment charges | 0 | 0 |  |  |  |
Interest Expense, Other |  |  | 62,600,000 | 0 |  |
New vehicles |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 1,596,700,000 | 1,403,800,000 | 4,694,800,000 | 4,137,400,000 |  |
New vehicles | Franchised Dealerships Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 1,569,900,000 | 1,391,600,000 | 4,621,300,000 | 4,117,100,000 |  |
Used vehicles |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 1,340,400,000 | 1,355,800,000 | 3,991,200,000 | 4,174,400,000 |  |
Used vehicles | Franchised Dealerships Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 780,700,000 | 842,400,000 | 2,322,800,000 | 2,568,100,000 |  |
Used vehicles | EchoPark Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 554,800,000 | 511,400,000 | 1,651,300,000 | 1,601,300,000 |  |
Wholesale vehicles |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 79,300,000 | 114,700,000 | 256,300,000 | 404,800,000 |  |
Wholesale vehicles | Franchised Dealerships Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 51,400,000 | 75,800,000 | 165,300,000 | 261,200,000 |  |
Wholesale vehicles | EchoPark Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 26,600,000 | 38,900,000 | 89,100,000 | 143,300,000 |  |
Parts, service and collision repair |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 453,400,000 | 408,200,000 | 1,327,600,000 | 1,188,600,000 |  |
Parts, service and collision repair | Franchised Dealerships Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 431,800,000 | 404,700,000 | 1,289,000,000 | 1,183,400,000 |  |
Finance, insurance and other, net |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 173,700,000 | 165,600,000 | 517,700,000 | 505,300,000 |  |
Finance, insurance and other, net | Franchised Dealerships Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 126,000,000.0 | 125,800,000 | 375,400,000 | 382,100,000 |  |
Finance, insurance and other, net | EchoPark Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 45,300,000 | 38,900,000 | 136,400,000 | 121,800,000 |  |
NewVehiclesMember | EchoPark Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 0 | 1,600,000 | 1,000,000.0 | 7,300,000 |  |
Retail New Vehicles [Member] |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 1,573,500,000 | 1,371,800,000 | 4,624,400,000 | 4,067,400,000 |  |
Retail New Vehicles [Member] | Franchised Dealerships Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 1,546,700,000 | 1,359,600,000 | 4,550,900,000 | 4,047,100,000 |  |
Fleet New Vehicles [Member] |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 23,200,000 | 32,000,000.0 | 70,400,000 | 70,000,000.0 |  |
Fleet New Vehicles [Member] | Franchised Dealerships Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 23,200,000 | 32,000,000.0 | 70,400,000 | 70,000,000.0 |  |
Retail New Vehcile |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Powersports New Vehicle Revenue | $ 26,800,000 | $ 10,600,000 | $ 72,500,000 | $ 13,000,000.0 |  |

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