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Segment Information - Summary of Reportable Operating Segment (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Revenues: |  |  |  |  |  |
Total consolidated revenues | $ 3,491,500,000 | $ 3,643,500,000 | $ 10,328,500,000 | $ 10,787,600,000 |  |
Segment income (loss): |  |  |  |  |  |
Segment income (loss) | 113,600,000 | 137,400,000 | 328,000,000.0 | 322,100,000 |  |
Interest expense, other, net | (29,800,000) | (29,000,000.0) | (88,100,000) | (86,200,000) |  |
Other income (expense), net | 0 | 200,000 | (500,000) | 300,000 |  |
Income (loss) from continuing operations before taxes | 60,800,000 | 91,200,000 | 174,000,000.0 | 187,300,000 |  |
Impairment charges | 0 | 0 | 2,400,000 | (62,600,000) |  |
Excluded non-recurring compensation-related charges | 1,800,000 |  |  | 5,100,000 |  |
FloorPlanDepositBalance | 400,000,000.0 |  | 400,000,000.0 |  | $ 345,000,000.0 |
Excluded storm-related physical damage and legal costs | 1,500,000 |  | 5,100,000 | 1,900,000 |  |
Impairment of Long-Lived Assets to be Disposed of |  |  |  | 32,500,000 |  |
Depreciation, Depletion and Amortization | 37,900,000 | 35,200,000 | 111,100,000 | 105,700,000 |  |
FloorPlanInterestExpense | 23,000,000.0 | 17,400,000 | 65,400,000 | 48,900,000 |  |
Interest Expense, Other | 29,800,000 | 29,000,000.0 | 88,100,000 | 86,200,000 |  |
Payments to Acquire Property, Plant, and Equipment | 53,300,000 | 78,100,000 | 145,900,000 | 153,600,000 |  |
Cash and cash equivalents | 17,600,000 | 34,600,000 | 17,600,000 | 34,600,000 | 28,900,000 | $ 229,200,000
Assets | 5,758,200,000 |  | 5,758,200,000 |  | 5,364,600,000 |
Gain on Franchise Disposal | (2,300,000) |  |  | (20,900,000) |  |
Powersports Used Vehicle Revenue | 9,000,000.0 | 4,900,000 | 17,600,000 | 17,100,000 |  |
Powersports Wholesale Vehicle Revenue | 1,100,000 | 1,300,000 | 2,300,000 | 1,900,000 |  |
Powersports Fixed Ops Revenue | 20,100,000 | 21,600,000 | 36,600,000 | 38,600,000 |  |
Powersports F&I Revenue | 2,300,000 | 2,400,000 | 5,800,000 | 5,900,000 |  |
Powersports Segment Revenue | 59,400,000 | 57,000,000.0 | 126,700,000 | 136,000,000.0 |  |
Excluded non-recurring compensation-related charges | 1,800,000 |  |  | 5,100,000 |  |
Franchised Dealerships Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 2,887,200,000 | 2,959,800,000 | 8,580,200,000 | 8,773,800,000 |  |
Segment income (loss): |  |  |  |  |  |
Interest expense, other, net | (28,500,000) | (27,900,000) | (84,100,000) | (82,200,000) |  |
Impairment charges | 0 | 0 | (1,000,000.0) | 0 |  |
Depreciation, Depletion and Amortization | 31,500,000 | 28,200,000 | 91,600,000 | 82,800,000 |  |
FloorPlanInterestExpense | 18,700,000 | 12,900,000 | 52,500,000 | 34,700,000 |  |
Interest Expense, Other | 28,500,000 | 27,900,000 | 84,100,000 | 82,200,000 |  |
Payments to Acquire Property, Plant, and Equipment | 50,300,000 | 72,100,000 | 141,400,000 | 137,300,000 |  |
Assets | 4,550,300,000 |  | 4,550,300,000 |  | 4,110,800,000 |
EchoPark Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 544,900,000 | 626,700,000 | 1,621,600,000 | 1,877,800,000 |  |
Segment income (loss): |  |  |  |  |  |
Interest expense, other, net | (700,000) | (700,000) | (2,000,000.0) | (2,500,000) |  |
Closed Store Accrued Expenses |  |  | 2,100,000 |  |  |
Impairment charges | 0 | 0 | (1,400,000) | (62,600,000) |  |
Excluded non-recurring compensation-related charges |  | 900,000 | 2,900,000 |  |  |
Depreciation, Depletion and Amortization | 5,400,000 | 6,100,000 | 16,400,000 | 20,400,000 |  |
FloorPlanInterestExpense | 3,700,000 | 4,300,000 | 11,300,000 | 13,600,000 |  |
Interest Expense, Other | 700,000 | 700,000 | 2,000,000.0 | 2,500,000 |  |
Payments to Acquire Property, Plant, and Equipment | 200,000 | 5,400,000 | 800,000 | 14,100,000 |  |
Assets | 567,400,000 |  | 567,400,000 |  | 667,900,000 |
Gain on Franchise Disposal |  |  | (2,900,000) |  |  |
Excluded non-recurring compensation-related charges |  | 900,000 | 2,900,000 |  |  |
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 | (600,000) | (400,000) | (1,900,000) | (1,500,000) |  |
Impairment charges | 0 | 0 | 0 | 0 |  |
Depreciation, Depletion and Amortization | 1,100,000 | 900,000 | 3,100,000 | 2,500,000 |  |
FloorPlanInterestExpense | 700,000 | 200,000 | 1,600,000 | 600,000 |  |
Interest Expense, Other | 600,000 | 400,000 | 1,900,000 | 1,500,000 |  |
Payments to Acquire Property, Plant, and Equipment | 2,800,000 | 600,000 | 3,700,000 | 2,200,000 |  |
Assets | 222,900,000 |  | 222,900,000 |  | $ 212,000,000.0 |
Operating segments |  |  |  |  |  |
Segment income (loss): |  |  |  |  |  |
Segment income (loss) | 60,800,000 | 91,200,000 | 176,400,000 | 249,900,000 |  |
Operating segments | Franchised Dealerships Segment |  |  |  |  |  |
Segment income (loss): |  |  |  |  |  |
Segment income (loss) | 51,600,000 | 101,500,000 | 168,000,000.0 | 357,200,000 |  |
Operating segments | EchoPark Segment |  |  |  |  |  |
Segment income (loss): |  |  |  |  |  |
Segment income (loss) | 5,200,000 | (16,900,000) | 6,100,000 | (116,500,000) |  |
Operating segments | Powersports Segment |  |  |  |  |  |
Segment income (loss): |  |  |  |  |  |
Segment income (loss) | 4,000,000.0 | 6,600,000 | 2,300,000 | 9,200,000 |  |
Reconciling items |  |  |  |  |  |
Segment income (loss): |  |  |  |  |  |
Interest expense, other, net |  |  | (2,400,000) | (62,600,000) |  |
Other income (expense), net | 60,800,000 | 91,200,000 | 174,000,000.0 | 187,300,000 |  |
Impairment charges | 0 | 0 |  |  |  |
Interest Expense, Other |  |  | 2,400,000 | 62,600,000 |  |
New vehicles |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 1,589,000,000 | 1,596,700,000 | 4,643,200,000 | 4,694,800,000 |  |
New vehicles | Franchised Dealerships Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 1,562,100,000 | 1,569,900,000 | 4,578,800,000 | 4,621,300,000 |  |
Used vehicles |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 1,180,700,000 | 1,340,400,000 | 3,582,500,000 | 3,991,200,000 |  |
Used vehicles | Franchised Dealerships Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 701,400,000 | 780,700,000 | 2,162,800,000 | 2,322,800,000 |  |
Used vehicles | EchoPark Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 470,300,000 | 554,800,000 | 1,402,000,000 | 1,651,300,000 |  |
Wholesale vehicles |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 67,200,000 | 79,300,000 | 215,800,000 | 256,300,000 |  |
Wholesale vehicles | Franchised Dealerships Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 42,400,000 | 51,400,000 | 139,100,000 | 165,300,000 |  |
Wholesale vehicles | EchoPark Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 23,800,000 | 26,600,000 | 74,400,000 | 89,100,000 |  |
Parts, service and collision repair |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 479,000,000.0 | 453,400,000 | 1,369,800,000 | 1,327,600,000 |  |
Parts, service and collision repair | Franchised Dealerships Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 458,900,000 | 431,800,000 | 1,333,200,000 | 1,289,000,000 |  |
Finance, insurance and other, net |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 175,600,000 | 173,700,000 | 517,200,000 | 517,700,000 |  |
Finance, insurance and other, net | Franchised Dealerships Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 122,400,000 | 126,000,000.0 | 366,300,000 | 375,400,000 |  |
Finance, insurance and other, net | EchoPark Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 50,800,000 | 45,300,000 | 145,200,000 | 136,400,000 |  |
NewVehiclesMember | EchoPark Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 0 | 0 | 0 | 1,000,000.0 |  |
Retail New Vehicles [Member] |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 1,566,800,000 | 1,573,500,000 | 4,575,200,000 | 4,624,400,000 |  |
Retail New Vehicles [Member] | Franchised Dealerships Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 1,539,900,000 | 1,546,700,000 | 4,510,800,000 | 4,550,900,000 |  |
Fleet New Vehicles [Member] |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 22,200,000 | 23,200,000 | 68,000,000.0 | 70,400,000 |  |
Fleet New Vehicles [Member] | Franchised Dealerships Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Total consolidated revenues | 22,200,000 | 23,200,000 | 68,000,000.0 | 70,400,000 |  |
Retail New Vehcile |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Powersports New Vehicle Revenue | $ 26,900,000 | $ 26,800,000 | 64,400,000 | $ 72,500,000 |  |
CDK Outage Impact [Member] | EchoPark Segment |  |  |  |  |  |
Segment income (loss): |  |  |  |  |  |
Excluded non-recurring compensation-related charges |  |  | 400,000 |  |  |
Excluded non-recurring compensation-related charges |  |  | 400,000 |  |  |
CDK Outage Impact [Member] | FranchisedDealershipsMember |  |  |  |  |  |
Segment income (loss): |  |  |  |  |  |
Excluded non-recurring compensation-related charges |  |  | 13,000,000.0 |  |  |
Excluded non-recurring compensation-related charges |  |  | $ 13,000,000.0 |  |  |

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