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Segment Information - Summary of Reportable Operating Segment (Details) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2024 USD ($) Segment | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating income (loss) |  |  | $ 461,500,000 | $ 423,600,000 | $ 314,000,000.0 |
Interest expense, other, net |  |  | (118,000,000.0) | (114,600,000) | (89,900,000) |
Other income (expense), net |  |  | (500,000) | 100,000 | 200,000 |
Income before taxes |  |  | 256,100,000 | 241,900,000 | 190,000,000.0 |
Segment Schedule Footnotes |  |  |  |  |  |
Asset impairment charges |  |  | 3,900,000 | 79,300,000 | 320,400,000 |
Storm-related physical damage and legal costs |  |  | 8,300,000 | 1,900,000 |  |
Total floor plan interest expense |  |  | 86,900,000 | 67,200,000 | 34,300,000 |
Depreciation, Depletion and Amortization, Nonproduction |  |  | 150,400,000 | 142,300,000 | 127,500,000 |
Total assets | $ 5,895,700,000 | $ 5,364,600,000 | 5,895,700,000 | 5,364,600,000 |  |
Cash and cash equivalents | 44,000,000.0 | 28,900,000 | 44,000,000.0 | 28,900,000 | 229,200,000 | $ 299,400,000
Goodwill | 358,500,000 | 253,800,000 | 358,500,000 | 253,800,000 | 231,000,000.0 |
Intangible Assets, Net (Excluding Goodwill) | 430,300,000 | 417,400,000 | $ 430,300,000 | 417,400,000 |  |
Number of operating segments | Segment |  |  | 3 |  |  |
Segment Income |  |  | $ 260,000,000.0 | 321,200,000 | 510,400,000 |
EchoPark Segment Income |  |  | 3,500,000 | (132,500,000) | (133,900,000) |
Powersports Segment Segment Income |  |  | (1,100,000) | 5,700,000 | 2,700,000 |
Segment Retail Units Sold |  |  |  |  |  |
Franchised Dealerships Used Vehicle Revenue |  |  | 2,919,800,000 | 3,050,300,000 | 3,391,500,000 |
Franchised Dealerships Wholesale Revenue |  |  | 188,900,000 | 204,500,000 | 314,000,000.0 |
Franchised Dealerships Fixed Ops Revenue |  |  | 1,802,900,000 | 1,714,200,000 | 1,588,000,000 |
Franchised Dealerships F&I Revenue |  |  | 506,800,000 | 498,600,000 | 510,100,000 |
Franchised New Vehicles Cost of Sales |  |  | (6,048,600,000) | (5,696,300,000) | (4,926,300,000) |
Franchised Fleet New Vehicle Cost of Sales |  |  | (92,300,000) | (88,200,000) | (94,500,000) |
Franchised Used Vehicles Cost of Sales |  |  | (2,769,600,000) | (2,887,400,000) | (3,217,100,000) |
EchoPark New Vehicle Revenue |  |  | 0 | 1,000,000.0 | 9,200,000 |
EchoPark Used Vehicle Revenue |  |  | 1,838,000,000 | 2,143,800,000 | 2,116,800,000 |
EchoPark Wholesale Revenue |  |  | 95,800,000 | 111,700,000 | 170,600,000 |
EchoPark F&I Revenue |  |  | 194,000,000.0 | 177,900,000 | 166,400,000 |
Powersports Used Vehicle Revenue |  |  | 22,300,000 | 19,500,000 | 7,100,000 |
Powersports Wholesale Vehicle Revenue |  |  | 2,300,000 | 2,600,000 | 300,000 |
Powersports Fixed Ops Revenue |  |  | 43,600,000 | 45,300,000 | 11,700,000 |
Powersports F&I Revenue |  |  | 7,100,000 | 7,200,000 | 2,600,000 |
Powersports Retail New Vehicles Cost of Sales |  |  | (70,500,000) | (72,000,000.0) | (25,400,000) |
Powersports Used vehicles Cost of Sales |  |  | (17,000,000.0) | (14,100,000) | (5,100,000) |
Powersports Wholesale vehicles Cost of Sales |  |  | (2,600,000) | (2,800,000) | (300,000) |
Powersports Parts, service and collision repair Cost of Sales |  |  | (23,500,000) | (24,000,000.0) | (5,900,000) |
Powersports Segment gross profit |  |  | 43,700,000 | 50,300,000 | 16,800,000 |
Powersports SG&A Expense - Compensation |  |  | (25,700,000) | (27,700,000) | (8,900,000) |
Powersports SG&A Expense - Advertising |  |  | (1,700,000) | (1,800,000) | (600,000) |
Powersports SG&A Expense - Rent |  |  | 900,000 | 500,000 | 0 |
Total revenues |  |  | 14,224,300,000 | 14,372,400,000 | 14,001,100,000 |
EchoPark Segment Assets | 574,500,000 | 667,900,000 | 574,500,000 | 667,900,000 |  |
PowerSport Segment Assets [Domain] | 232,700,000 | 212,000,000.0 | 232,700,000 | 212,000,000.0 |  |
Powersport Interest Expense, Other, Net |  |  | (2,600,000) | (1,700,000) | (1,000,000.0) |
Powersports Other income (expense), net |  |  | 0 | 0 | 200,000 |
Powersports Floorplan Exp |  |  | (2,100,000) | (600,000) | 0 |
Powersports Depreciation and Amortization |  |  | (4,200,000) | (3,400,000) | (1,000,000.0) |
Powersports Capital Expenditures |  |  | 3,900,000 | 6,900,000 | 200,000 |
EchoPark New Vehicle Cost of Sales |  |  |  | (900,000) | (8,100,000) |
EchoPark Used Vehicle Cost of Sales |  |  | (1,822,800,000) | (2,160,900,000) | (2,112,400,000) |
EchoPark Wholesale Cost of Sales |  |  | (97,100,000) | (110,800,000) | (167,400,000) |
EchoPark Segment Gross Profit |  |  | 207,900,000 | 161,800,000 | 175,100,000 |
EchoPark SG&A Expense - Compensation |  |  | (95,800,000) | (132,000,000.0) | (148,000,000.0) |
EchoPark SG&A Expense - Advertising |  |  | (27,700,000) | (49,900,000) | (58,000,000.0) |
EchoPark SG&A Expense - Rent |  |  | 1,700,000 | (6,300,000) | (8,500,000) |
EchoPark SG&A Expense - Other |  |  | (43,900,000) | (58,800,000) | (55,300,000) |
Franchised Wholesale Vehicles Cost of Sales |  |  | (193,500,000) | (207,800,000) | (320,300,000) |
Franchised Parts, service and collision repair Cost of Sales |  |  | (894,000,000.0) | (861,500,000) | (801,300,000) |
Franchised Segment Gross Profit |  |  | 1,941,200,000 | 2,033,600,000 | 2,125,100,000 |
Franchised SG&A expense - Compensation |  |  | (892,400,000) | (856,600,000) | (858,000,000.0) |
Franchised SG&A Expense - Advertising |  |  | (55,100,000) | (40,500,000) | (36,900,000) |
Franchised SG&A Expense - Rent |  |  | (39,200,000) | (40,300,000) | (42,400,000) |
Franchised SG&A Expense - Other |  |  | (388,700,000) | (377,200,000) | (335,700,000) |
Franchised Dealerships Depreciation and Amortization |  |  | (124,400,000) | (112,300,000) | (101,800,000) |
Franchised Dealerships Floorplan Exp |  |  | (70,600,000) | (49,200,000) | (23,600,000) |
Franchised Segment Interest Expense, Other, Net |  |  | (112,700,000) | (109,700,000) | (85,000,000.0) |
Franchised Other income (expense), net |  |  | (500,000) | 200,000 | (100,000) |
Franchised Dealerships Segment Income |  |  | 257,600,000 | 448,000,000.0 | 641,600,000 |
Powersports SG&A Expense - Other |  |  | (9,400,000) | (9,900,000) | (2,800,000) |
Echo Park [Member] |  |  |  |  |  |
Segment Schedule Footnotes |  |  |  |  |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |  |  | 0.0 |  |  |
Asset impairment charges |  | $ 16,700,000 |  |  |  |
Property, Plant and Equipment | Echo Park [Member] |  |  |  |  |  |
Segment Schedule Footnotes |  |  |  |  |  |
Asset impairment charges | $ 10,200,000 |  |  |  |  |
Fleet new vehicles |  |  |  |  |  |
Segment Retail Units Sold |  |  |  |  |  |
Total revenues |  |  | 95,300,000 | 92,200,000 | 99,400,000 |
Total new vehicles |  |  |  |  |  |
Segment Retail Units Sold |  |  |  |  |  |
Total revenues |  |  | 6,602,800,000 | 6,396,800,000 | 5,722,000,000 |
Retail new vehicles |  |  |  |  |  |
Segment Retail Units Sold |  |  |  |  |  |
Powersports New Vehicle Revenue |  |  | 82,000,000.0 | 88,600,000 | 31,800,000 |
Total revenues |  |  | 6,507,500,000 | 6,304,600,000 | 5,622,600,000 |
Echo Park [Member] |  |  |  |  |  |
Segment Schedule Footnotes |  |  |  |  |  |
Asset impairment charges |  |  |  | 78,300,000 |  |
Nonrecurring Compensation Expense |  |  | 2,900,000 | 5,100,000 |  |
Segment Retail Units Sold |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  | 300,000 |  |
Gain (Loss) on Disposition of Property Plant Equipment |  |  | (2,100,000) |  |  |
Echo Park [Member] | Property, Plant and Equipment |  |  |  |  |  |
Segment Schedule Footnotes |  |  |  |  |  |
Asset impairment charges |  |  | 2,700,000 |  |  |
Echo Park [Member] | CDK Outage Impact |  |  |  |  |  |
Segment Schedule Footnotes |  |  |  |  |  |
Nonrecurring Compensation Expense |  |  | 400,000 |  |  |
Franchised Dealership Impairment [Member] |  |  |  |  |  |
Segment Schedule Footnotes |  |  |  |  |  |
Asset impairment charges |  |  |  |  | 115,500,000 |
Franchised Dealership Impairment [Member] | Property, Plant and Equipment |  |  |  |  |  |
Segment Schedule Footnotes |  |  |  |  |  |
Asset impairment charges |  |  | 1,200,000 |  |  |
FranchisedDealershipMember [Member] |  |  |  |  |  |
Segment Schedule Footnotes |  |  |  |  |  |
Nonrecurring Compensation Expense |  |  | 2,200,000 |  |  |
FranchisedDealershipMember [Member] | Fleet new vehicles |  |  |  |  |  |
Segment Retail Units Sold |  |  |  |  |  |
Total revenues |  |  | 95,300,000 | 92,200,000 | 99,400,000 |
FranchisedDealershipMember [Member] | Retail new vehicles |  |  |  |  |  |
Segment Retail Units Sold |  |  |  |  |  |
Total revenues |  |  | 6,425,500,000 | 6,215,000,000 | 5,581,600,000 |
FranchisedDealershipMember [Member] | CDK Outage Impact |  |  |  |  |  |
Segment Schedule Footnotes |  |  |  |  |  |
Nonrecurring Compensation Expense |  |  | 13,000,000.0 |  |  |
Franchised Dealerships [Member] |  |  |  |  |  |
Segment Schedule Footnotes |  |  |  |  |  |
Asset impairment charges |  |  |  | $ 1,000,000.0 |  |
PreOwnedStoreMember [Member] |  |  |  |  |  |
Segment Schedule Footnotes |  |  |  |  |  |
Asset impairment charges |  |  |  |  | $ 204,900,000 |
Powersports Dealerships |  |  |  |  |  |
Segment Schedule Footnotes |  |  |  |  |  |
Nonrecurring Compensation Expense |  |  | $ 500,000 |  |  |

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