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Segment Information - Summary of Reportable Operating Segment (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Revenues: |  |  |  |  |  |
Total consolidated revenues | $ 3,453,000,000 | $ 3,652,900,000 | $ 6,837,000,000 | $ 7,144,100,000 |  |
Segment income (loss): |  |  |  |  |  |
Segment income (loss) | 107,700,000 | 78,300,000 | 214,400,000 | 184,700,000 |  |
Interest expense, other, net | (29,300,000) | (28,900,000) | (58,300,000) | (57,300,000) |  |
Other income (expense), net | (500,000) | 100,000 | (400,000) | 200,000 |  |
Income (loss) from continuing operations before taxes | 55,700,000 | 32,500,000 | 113,200,000 | 96,100,000 |  |
Impairment charges | (1,400,000) | (62,600,000) | 2,400,000 | (62,600,000) |  |
Excluded non-recurring compensation-related charges | 11,200,000 |  |  | 4,200,000 |  |
FloorPlanDepositBalance | 400,000,000.0 |  | 400,000,000.0 |  | $ 345,000,000.0 |
Excluded storm-related physical damage and legal costs | 3,600,000 | 1,900,000 | 3,600,000 | 1,900,000 |  |
Depreciation, Depletion and Amortization | 37,000,000.0 | 36,100,000 | 73,200,000 | 70,500,000 |  |
FloorPlanInterestExpense | 22,200,000 | 17,000,000.0 | 42,500,000 | 31,500,000 |  |
Interest Expense, Other | 29,300,000 | 28,900,000 | 58,300,000 | 57,300,000 |  |
Payments to Acquire Property, Plant, and Equipment | 48,800,000 | 38,300,000 | 92,600,000 | 75,500,000 |  |
Cash and cash equivalents | 67,200,000 | 119,700,000 | 67,200,000 | 119,700,000 | 28,900,000 | $ 229,200,000
Assets | 5,804,200,000 |  | 5,804,200,000 |  | 5,364,600,000 |
Gain on Franchise Disposal | (600,000) | 20,900,000 |  | 20,900,000 |  |
Powersports Used Vehicle Revenue | 5,300,000 | 7,400,000 | 8,700,000 | 12,300,000 |  |
Powersports Wholesale Vehicle Revenue | 900,000 | 400,000 | 1,100,000 | 500,000 |  |
Powersports Fixed Ops Revenue | 9,700,000 | 10,300,000 | 16,500,000 | 17,000,000.0 |  |
Powersports F&I Revenue | 2,000,000.0 | 2,000,000.0 | 3,500,000 | 3,500,000 |  |
Powersports Segment Revenue | 39,600,000 | 45,000,000.0 | 67,300,000 | 79,000,000.0 |  |
Excluded non-recurring compensation-related charges | 11,200,000 |  |  | 4,200,000 |  |
Franchised Dealerships Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 2,896,200,000 | 3,007,300,000 | 5,693,000,000 | 5,814,000,000 |  |
Segment income (loss): |  |  |  |  |  |
Interest expense, other, net | (27,800,000) | (27,500,000) | (55,600,000) | (54,400,000) |  |
Impairment charges | 0 | 0 | (1,000,000.0) | 0 |  |
Depreciation, Depletion and Amortization | 30,400,000 | 27,900,000 | 60,200,000 | 54,500,000 |  |
FloorPlanInterestExpense | 18,000,000.0 | 11,900,000 | 34,000,000.0 | 21,800,000 |  |
Interest Expense, Other | 27,800,000 | 27,500,000 | 55,600,000 | 54,400,000 |  |
Payments to Acquire Property, Plant, and Equipment | 48,000,000.0 | 34,400,000 | 91,100,000 | 65,400,000 |  |
Assets | 4,499,000,000 |  | 4,499,000,000 |  | 4,110,800,000 |
EchoPark Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 517,300,000 | 600,600,000 | 1,076,700,000 | 1,251,100,000 |  |
Segment income (loss): |  |  |  |  |  |
Interest expense, other, net | (700,000) | (900,000) | (1,300,000) | (1,800,000) |  |
Closed Store Accrued Expenses |  |  | 2,200,000 |  |  |
Impairment charges | (1,400,000) | (62,600,000) | (1,400,000) | (62,600,000) |  |
Excluded non-recurring compensation-related charges | 700,000 | 2,200,000 | 2,700,000 |  |  |
Depreciation, Depletion and Amortization | 5,600,000 | 7,400,000 | 11,100,000 | 14,400,000 |  |
FloorPlanInterestExpense | 3,800,000 | 4,800,000 | 7,600,000 | 9,300,000 |  |
Interest Expense, Other | 700,000 | 900,000 | 1,300,000 | 1,800,000 |  |
Payments to Acquire Property, Plant, and Equipment | 200,000 | 2,800,000 | 600,000 | 8,500,000 |  |
Assets | 603,400,000 |  | 603,400,000 |  | 667,900,000 |
Gain on Franchise Disposal |  |  | (600,000) |  |  |
Excluded non-recurring compensation-related charges | 700,000 | 2,200,000 | 2,700,000 |  |  |
FranchisedDealershipsMember |  |  |  |  |  |
Segment income (loss): |  |  |  |  |  |
Impairment charges |  |  | (1,000,000.0) |  |  |
Excluded non-recurring compensation-related charges |  |  | 2,200,000 |  |  |
Excluded non-recurring compensation-related charges |  |  | 2,200,000 |  |  |
Powersports Segment |  |  |  |  |  |
Segment income (loss): |  |  |  |  |  |
Interest expense, other, net | (800,000) | (500,000) | (1,300,000) | (1,100,000) |  |
Impairment charges | 0 | 0 | 0 | 0 |  |
Depreciation, Depletion and Amortization | 1,000,000.0 | 800,000 | 2,000,000.0 | 1,600,000 |  |
FloorPlanInterestExpense | 500,000 | 300,000 | 1,000,000.0 | 400,000 |  |
Interest Expense, Other | 800,000 | 500,000 | 1,300,000 | 1,100,000 |  |
Payments to Acquire Property, Plant, and Equipment | 600,000 | 1,100,000 | 900,000 | 1,600,000 |  |
Assets | 234,600,000 |  | 234,600,000 |  | $ 212,000,000.0 |
Operating segments |  |  |  |  |  |
Segment income (loss): |  |  |  |  |  |
Segment income (loss) | 57,100,000 | 95,100,000 | 115,600,000 | 158,700,000 |  |
Operating segments | Franchised Dealerships Segment |  |  |  |  |  |
Segment income (loss): |  |  |  |  |  |
Segment income (loss) | 52,700,000 | 145,900,000 | 116,400,000 | 255,800,000 |  |
Operating segments | EchoPark Segment |  |  |  |  |  |
Segment income (loss): |  |  |  |  |  |
Segment income (loss) | 3,900,000 | (52,800,000) | 900,000 | (99,700,000) |  |
Operating segments | Powersports Segment |  |  |  |  |  |
Segment income (loss): |  |  |  |  |  |
Segment income (loss) | 500,000 | 2,000,000.0 | (1,700,000) | 2,600,000 |  |
Reconciling items |  |  |  |  |  |
Segment income (loss): |  |  |  |  |  |
Interest expense, other, net |  |  | (2,400,000) | (62,600,000) |  |
Other income (expense), net | 55,700,000 | 32,500,000 | 113,200,000 | 96,100,000 |  |
Impairment charges | 1,400,000 | 62,600,000 |  |  |  |
Interest Expense, Other |  |  | 2,400,000 | 62,600,000 |  |
New vehicles |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 1,578,800,000 | 1,636,500,000 | 3,054,200,000 | 3,098,100,000 |  |
New vehicles | Franchised Dealerships Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 1,557,100,000 | 1,611,600,000 | 3,016,600,000 | 3,051,400,000 |  |
Used vehicles |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 1,186,200,000 | 1,305,900,000 | 2,401,800,000 | 2,650,800,000 |  |
Used vehicles | Franchised Dealerships Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 732,100,000 | 774,500,000 | 1,461,400,000 | 1,542,000,000 |  |
Used vehicles | EchoPark Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 448,900,000 | 524,000,000.0 | 931,700,000 | 1,096,500,000 |  |
Wholesale vehicles |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 71,300,000 | 91,500,000 | 148,600,000 | 177,000,000.0 |  |
Wholesale vehicles | Franchised Dealerships Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 48,400,000 | 55,600,000 | 96,900,000 | 114,000,000.0 |  |
Wholesale vehicles | EchoPark Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 21,900,000 | 35,500,000 | 50,700,000 | 62,500,000 |  |
Parts, service and collision repair |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 444,100,000 | 443,700,000 | 890,800,000 | 874,200,000 |  |
Parts, service and collision repair | Franchised Dealerships Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 434,400,000 | 433,400,000 | 874,300,000 | 857,200,000 |  |
Finance, insurance and other, net |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 172,600,000 | 175,300,000 | 341,600,000 | 344,000,000.0 |  |
Finance, insurance and other, net | Franchised Dealerships Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 124,200,000 | 132,200,000 | 243,800,000 | 249,400,000 |  |
Finance, insurance and other, net | EchoPark Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 46,500,000 | 41,100,000 | 94,300,000 | 91,100,000 |  |
NewVehiclesMember | EchoPark Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 0 | 0 | 0 | 1,000,000.0 |  |
Retail New Vehicles [Member] |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 1,552,600,000 | 1,608,200,000 | 3,008,400,000 | 3,051,000,000 |  |
Retail New Vehicles [Member] | Franchised Dealerships Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 1,530,900,000 | 1,583,300,000 | 2,970,800,000 | 3,004,300,000 |  |
Fleet New Vehicles [Member] |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 26,200,000 | 28,300,000 | 45,800,000 | 47,100,000 |  |
Fleet New Vehicles [Member] | Franchised Dealerships Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 26,200,000 | 28,300,000 | 45,800,000 | 47,100,000 |  |
Retail New Vehcile |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Powersports New Vehicle Revenue | 21,700,000 | $ 24,900,000 | 37,500,000 | $ 45,700,000 |  |
CDK Outage Impact [Member] | EchoPark Segment |  |  |  |  |  |
Segment income (loss): |  |  |  |  |  |
Excluded non-recurring compensation-related charges | 400,000 |  | 400,000 |  |  |
Excluded non-recurring compensation-related charges | $ 400,000 |  | 400,000 |  |  |
CDK Outage Impact [Member] | FranchisedDealershipsMember |  |  |  |  |  |
Segment income (loss): |  |  |  |  |  |
Excluded non-recurring compensation-related charges |  |  | 11,200,000 |  |  |
Excluded non-recurring compensation-related charges |  |  | $ 11,200,000 |  |  |

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