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Segment Information - Summary of Reportable Operating Segment (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Revenues: |  |  |  |  |  |
Total consolidated revenues | $ 3,652,900,000 | $ 3,506,200,000 | $ 7,144,100,000 | $ 6,962,400,000 |  |
Segment income (loss): |  |  |  |  |  |
Segment income (loss) | 78,300,000 | 154,800,000 | 184,700,000 | 309,200,000 |  |
Interest expense, other, net | (28,900,000) | (21,300,000) | (57,300,000) | (42,100,000) |  |
Other income (expense), net | 100,000 | (200,000) | 200,000 | 100,000 |  |
Income (loss) from continuing operations before taxes | 32,500,000 | 127,200,000 | 96,100,000 | 256,100,000 |  |
FloorPlanDepositBalance | 287,000,000.0 |  | 287,000,000.0 |  | $ 272,000,000.0 |
Impairment charges | (62,600,000) | 0 | (62,600,000) | 0 |  |
Impairment of Long-Lived Assets to be Disposed of |  |  | 32,500,000 |  |  |
Depreciation, Depletion and Amortization | 36,100,000 | 31,200,000 | 70,500,000 | 61,100,000 |  |
FloorPlanInterestExpense | 17,000,000.0 | 6,100,000 | 31,500,000 | 11,100,000 |  |
Interest Expense, Other | 28,900,000 | 21,300,000 | 57,300,000 | 42,100,000 |  |
Payments to Acquire Property, Plant, and Equipment | 38,300,000 | 41,600,000 | 75,500,000 | 100,400,000 |  |
Cash and cash equivalents | 119,700,000 | 327,100,000 | 119,700,000 | 327,100,000 | 229,200,000 | $ 299,400,000
Assets | 5,081,600,000 |  | 5,081,600,000 |  | 4,978,300,000 |
Powersports Used Vehicle Revenue | 7,400,000 | 1,900,000 | 12,300,000 | 2,900,000 |  |
Powersports Wholesale Vehicle Revenue | 400,000 | 200,000 | 500,000 | 200,000 |  |
Powersports Fixed Ops Revenue | 10,300,000 | 1,100,000 | 17,000,000.0 | 1,800,000 |  |
Powersports F&I Revenue | 2,000,000.0 | 300,000 | 3,500,000 | 500,000 |  |
Powersports Segment Revenue | 45,000,000.0 | 4,700,000 | 79,000,000.0 | 7,900,000 |  |
Franchised Dealerships Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 3,007,300,000 | 2,840,600,000 | 5,814,000,000 | 5,671,500,000 |  |
Segment income (loss): |  |  |  |  |  |
Interest expense, other, net | (27,500,000) | (20,200,000) | (54,400,000) | (40,300,000) |  |
Depreciation, Depletion and Amortization | 27,900,000 | 25,300,000 | 54,500,000 | 50,000,000.0 |  |
FloorPlanInterestExpense | 11,900,000 | 3,900,000 | 21,800,000 | 7,200,000 |  |
Interest Expense, Other | 27,500,000 | 20,200,000 | 54,400,000 | 40,300,000 |  |
Payments to Acquire Property, Plant, and Equipment | 34,400,000 | 21,900,000 | 65,400,000 | 52,000,000.0 |  |
Assets | 4,439,300,000 |  | 4,439,300,000 |  | 4,091,700,000 |
EchoPark Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 600,600,000 | 660,900,000 | 1,251,100,000 | 1,283,000,000 |  |
Segment income (loss): |  |  |  |  |  |
Interest expense, other, net | (900,000) | (1,100,000) | (1,800,000) | (1,800,000) |  |
Depreciation, Depletion and Amortization | 7,400,000 | 5,800,000 | 14,400,000 | 10,900,000 |  |
FloorPlanInterestExpense | 4,800,000 | 2,200,000 | 9,300,000 | 3,900,000 |  |
Interest Expense, Other | 900,000 | 1,100,000 | 1,800,000 | 1,800,000 |  |
Payments to Acquire Property, Plant, and Equipment | 2,800,000 | 19,700,000 | 8,500,000 | 48,400,000 |  |
Assets | 28,100,000 |  | 28,100,000 |  | 267,600,000 |
Powersports Segment |  |  |  |  |  |
Segment income (loss): |  |  |  |  |  |
Interest expense, other, net | (500,000) | 0 | (1,100,000) | 0 |  |
Depreciation, Depletion and Amortization | 800,000 | 100,000 | 1,600,000 | 200,000 |  |
FloorPlanInterestExpense | 300,000 | 0 | 400,000 | 0 |  |
Interest Expense, Other | 500,000 | 0 | 1,100,000 | 0 |  |
Payments to Acquire Property, Plant, and Equipment | 1,100,000 | 0 | 1,600,000 | 0 |  |
Assets | 207,500,000 |  | 207,500,000 |  | $ 117,800,000 |
Operating segments | Franchised Dealerships Segment |  |  |  |  |  |
Segment income (loss): |  |  |  |  |  |
Segment income (loss) | 145,900,000 | 162,100,000 | 255,800,000 | 326,000,000.0 |  |
Operating segments | EchoPark Segment |  |  |  |  |  |
Segment income (loss): |  |  |  |  |  |
Segment income (loss) | (52,800,000) | (34,200,000) | (99,700,000) | (69,600,000) |  |
Operating segments | Powersports Segment |  |  |  |  |  |
Segment income (loss): |  |  |  |  |  |
Segment income (loss) | 2,000,000.0 | (700,000) | 2,600,000 | (300,000) |  |
Reconciling items |  |  |  |  |  |
Segment income (loss): |  |  |  |  |  |
Other income (expense), net | 32,500,000 | 127,200,000 | 96,100,000 | 256,100,000 |  |
New vehicles |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 1,636,500,000 | 1,364,100,000 | 3,098,100,000 | 2,733,600,000 |  |
New vehicles | Franchised Dealerships Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 1,611,600,000 | 1,361,600,000 | 3,051,400,000 | 2,725,400,000 |  |
Used vehicles |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 1,305,900,000 | 1,448,300,000 | 2,650,800,000 | 2,818,400,000 |  |
Used vehicles | Franchised Dealerships Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 774,500,000 | 871,900,000 | 1,542,000,000 | 1,725,700,000 |  |
Used vehicles | EchoPark Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 524,000,000.0 | 574,500,000 | 1,096,500,000 | 1,089,800,000 |  |
Wholesale vehicles |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 91,500,000 | 121,400,000 | 177,000,000.0 | 290,200,000 |  |
Wholesale vehicles | Franchised Dealerships Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 55,600,000 | 79,200,000 | 114,000,000.0 | 185,500,000 |  |
Wholesale vehicles | EchoPark Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 35,500,000 | 42,000,000.0 | 62,500,000 | 104,500,000 |  |
Parts, service and collision repair |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 443,700,000 | 399,200,000 | 874,200,000 | 780,500,000 |  |
Parts, service and collision repair | Franchised Dealerships Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 433,400,000 | 398,100,000 | 857,200,000 | 778,700,000 |  |
Finance, insurance and other, net |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 175,300,000 | 173,200,000 | 344,000,000.0 | 339,700,000 |  |
Finance, insurance and other, net | Franchised Dealerships Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 132,200,000 | 129,800,000 | 249,400,000 | 256,200,000 |  |
Finance, insurance and other, net | EchoPark Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 41,100,000 | 43,100,000 | 91,100,000 | 83,000,000.0 |  |
NewVehiclesMember | EchoPark Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 0 | 1,300,000 | 1,000,000.0 | 5,700,000 |  |
Retail New Vehicles [Member] |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 1,608,200,000 | 1,344,300,000 | 3,051,000,000 | 2,695,600,000 |  |
Retail New Vehicles [Member] | Franchised Dealerships Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 1,583,300,000 | 1,341,700,000 | 3,004,300,000 | 2,687,400,000 |  |
Fleet New Vehicles [Member] |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 28,300,000 | 19,800,000 | 47,100,000 | 38,000,000.0 |  |
Fleet New Vehicles [Member] | Franchised Dealerships Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 28,300,000 | 19,900,000 | 47,100,000 | 38,000,000.0 |  |
Retail New Vehcile |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Powersports New Vehicle Revenue | $ 24,900,000 | $ 1,200,000 | $ 45,700,000 | $ 2,500,000 |  |

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