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Business Acquisitions and Dispositions - Additional Information (Details) | 3 Months Ended | 12 Months Ended |  |
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Dec. 31, 2024 USD ($) Store | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2024 USD ($) Store store | Dec. 31, 2023 USD ($) store retailUnits | Dec. 31, 2022 USD ($) store | Dec. 31, 2024 USD ($) | Dec. 31, 2024 store | Dec. 31, 2024 Brand | Dec. 31, 2024 | Mar. 31, 2024 USD ($)
Luxury Franchise [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of franchises disposed | store |  |  |  |  |  | 2 | 1 |  |  |  |  |  |
Northwest Motorsport |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Preowned Stores Closed |  |  | 7 |  |  | 3 |  |  |  |  |  |  |
Number of Preowned Stores Closed |  |  | 7 |  |  | 3 |  |  |  |  |  |  |
Echo Park [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  | $ 16,700,000 |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  | 16,700,000 |  |  |  |  |  |  |  |  |  |
Mid-line import franchise |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of franchises disposed | store |  |  |  |  |  | 2 | 1 |  |  |  |  |  |
EchoPark Delivery/Buy Centers |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Preowned Stores Closed |  |  |  |  |  |  | 14 |  |  |  |  |  |
Number of Preowned Stores Closed |  |  |  |  |  |  | 14 |  |  |  |  |  |
Domestic Franchise |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of franchises disposed | store |  |  |  |  |  |  | 1 |  |  |  |  |  |
EchoPark Stores [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of terminated stores | store |  |  |  |  |  | 7 |  |  |  |  |  |  |
Number of Preowned Stores Closed |  |  |  |  |  |  | 8 |  |  |  |  |  |
Number of Preowned Stores Closed |  |  |  |  |  |  | 8 |  |  |  |  |  |
Number of franchise dealerships opened | store |  |  |  |  |  | 2 |  | 2 |  |  |  |  |
Business acquisition, consideration amount |  |  |  |  |  |  |  | $ 87,600,000 |  |  |  |  |
Number of franchises disposed | store |  |  |  |  |  |  |  | 0 |  |  |  |  |
Cash generated from disposition |  |  |  |  |  | $ 8,200,000 | $ 52,200,000 |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  |  |  | $ (55,300,000) | $ (75,100,000) | $ (102,300,000) |  |  |  |  |
Number of Powersports Stores Acquired | store |  |  |  |  |  | 1 | 1 | 2 |  |  |  |  |
Number of different brands of cars and light trucks | Brand |  |  |  |  |  |  |  |  |  |  | 25 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable |  |  |  |  |  |  |  | $ 400,000 | $ 3,300,000 |  |  |  |
Number of Powersports Stores Acquired | store |  |  |  |  |  | 1 | 1 | 2 |  |  |  |  |
Restructuring Costs |  | $ 75,200,000 |  | $ 4,800,000 | $ 75,200,000 |  |  |  |  |  |  |  |
Number of different brands of cars and light trucks | Brand |  |  |  |  |  |  |  |  |  |  | 25 |  |
Asset Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Land |  |  | 29,000,000.0 |  |  |  | $ 29,000,000.0 | $ 8,100,000 | 5,200,000 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory |  |  | 11,100,000 |  |  |  | 11,100,000 | 31,000,000.0 | 17,200,000 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other |  |  | 100,000 |  |  |  | 100,000 | 1,100,000 | 100,000 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  | 700,000 |  |  |  | 700,000 | 500,000 | 300,000 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  | 11,900,000 |  |  |  | 11,900,000 | 14,100,000 | 7,800,000 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  | 22,600,000 |  |  |  | 22,600,000 | 33,200,000 | 6,900,000 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  | $ (300,000) |  |  |  | (300,000) |  |  |  |  |  |
PY Acq Goodwill Allocations Fdealer |  |  |  |  |  |  | (400,000) |  |  |  |  |  |
PY Acq Goodwill Allocations Powersports |  |  |  |  |  |  | 2,900,000 |  |  |  |  |  |
Restructuring Costs |  | $ 75,200,000 |  | 4,800,000 | 75,200,000 |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  | $ 3,900,000 | 79,300,000 | 320,400,000 |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain |  |  |  |  |  | (3,500,000) | 0 | 0 |  |  |  |  |
Business Combination, Recognized Identifiable Asset Acquired and Liability Assumed, Lease Right-of-use Asset |  |  |  |  |  | 13,300,000 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Asset Acquired and Liability Assumed, Lease Obligation |  |  |  |  |  |  |  |  | (13,300,000) |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable |  |  |  |  |  |  |  | (400,000) | (3,300,000) |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  |  |  | (55,300,000) | (75,100,000) | (102,300,000) |  |  |  |  |
Business Acquisition, Pro Forma Revenue |  |  |  |  |  | 14,325,600,000 |  |  |  |  |  |  |
Business Acquisition, Pro Forma Earnings |  |  |  |  |  | 258,700,000 |  |  |  |  |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  |  |  |  |  | 19,600,000 |  |  |  |  |  |  |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  |  |  |  |  | 4,000,000.0 |  |  |  |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred |  |  |  |  |  |  |  | 14,700,000 |  |  |  |  |
Severance Costs |  |  |  | 900,000 | 2,200,000 |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  | 3,900,000 | 79,300,000 | 320,400,000 |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain |  |  |  |  |  | (3,500,000) | 0 | $ 0 |  |  |  |  |
Equity Ownership, Excluding Consolidated Entity and Equity Method Investee, Percentage |  |  |  |  |  |  |  |  |  |  |  | 50.00% |
Business Acquisition, Earnings Reported by Acquired Entity for Last Annual Period |  |  |  |  |  |  | 242,300,000 |  |  |  |  |  |
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period |  |  |  |  |  |  | 14,537,600,000 |  |  |  |  |  |
Business Acquisition, Transaction Costs |  |  |  |  |  |  |  |  | 0 |  |  |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  |  |  |  |  |  |  |  | 16,600,000 |  |  |  |
North Point Volvo [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  |  |  | (21,100,000) |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable |  |  |  |  |  |  |  |  | (3,000,000.0) |  |  |  |
Asset Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory |  |  |  |  |  |  |  |  | 10,700,000 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other |  |  |  |  |  |  |  |  | 1,700,000 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  |  |  |  |  |  |  | 200,000 |  |  |  | $ 12,400,000
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  |  |  |  |  |  |  | 3,500,000 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  |  |  |  |  | 6,000,000.0 |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain |  |  |  |  |  | 3,500,000 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable |  |  |  |  |  |  |  |  | $ 3,000,000.0 |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  |  |  | (21,100,000) |  |  |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain |  |  |  |  |  | $ 3,500,000 |  |  |  |  |  |  |
Inventories |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Costs |  |  |  |  | 10,000,000.0 |  |  |  |  |  |  |  |
Asset Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Costs |  |  |  |  | 10,000,000.0 |  |  |  |  |  |  |  |
Echo Park [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Stores | Store | 18 |  |  |  |  | 18 |  |  |  |  |  |  |
Number of Stores | Store | 18 |  |  |  |  | 18 |  |  |  |  |  |  |
Asset Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  |  | 78,300,000 |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  |  | 78,300,000 |  |  |  |  |  |
Franchised Dealerships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Stores | Store | 108 |  |  |  |  | 108 |  |  |  |  |  |  |
Number of Stores | Store | 108 |  |  |  |  | 108 |  |  |  |  |  |  |
Asset Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  |  | 1,000,000.0 |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  |  | $ 1,000,000.0 |  |  |  |  |  |
Powersports Dealerships |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of businesses acquired | store |  |  |  |  |  | 2 | 5 | 8 |  |  |  |  |
Number of Stores | 11 |  |  |  |  | 11 |  |  |  | 15 |  |  |
Number of Stores | 11 |  |  |  |  | 11 |  |  |  | 15 |  |  |
Number of Businesses Acquired | store |  |  |  |  |  | 2 | 5 | 8 |  |  |  |  |
Powersports Dealerships | Powersports Dealerships |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of businesses acquired | retailUnits |  |  |  |  |  |  | 1 |  |  |  |  |  |
Number of Businesses Acquired | retailUnits |  |  |  |  |  |  | 1 |  |  |  |  |  |
Contract Termination |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Costs |  |  |  | 3,900,000 | 400,000 |  |  |  |  |  |  |  |
Asset Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Costs |  |  |  | $ 3,900,000 | 400,000 |  |  |  |  |  |  |  |
Contract Termination |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Costs |  |  |  |  | 14,100,000 |  |  |  |  |  |  |  |
Asset Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Costs |  |  |  |  | 14,100,000 |  |  |  |  |  |  |  |
Property, Plant and Equipment | Echo Park [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges | $ 10,200,000 |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges | 10,200,000 |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Costs |  |  |  |  | 32,500,000 |  |  |  |  |  |  |  |
Asset Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Costs |  |  |  |  | 32,500,000 |  |  |  |  |  |  |  |
Property, Plant and Equipment | Echo Park [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  | $ 2,700,000 |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  | 2,700,000 |  |  |  |  |  |  |
ROU Asset |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Costs |  |  |  |  | 16,000,000.0 |  |  |  |  |  |  |  |
Asset Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Costs |  |  |  |  | $ 16,000,000.0 |  |  |  |  |  |  |  |
Asset impairment charges | 6,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges | 6,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Total PP&E Impairment |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges | 16,700,000 |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges | $ 16,700,000 |  |  |  |  |  |  |  |  |  |  |  |
Franchised Dealerships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  |  |  | (34,200,000) |  |  |  |  |  |  |
Asset Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  |  |  | $ (34,200,000) |  |  |  |  |  |  |
Franchised [Domain] | Franchised [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of businesses acquired | retailUnits |  |  |  |  |  |  | 1 |  |  |  |  |  |
Number of Businesses Acquired | retailUnits |  |  |  |  |  |  | 1 |  |  |  |  |  |

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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 805 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479328/805-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 805 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479328/805-10-50-2 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 30 -Paragraph 8 -SubTopic 30 -Topic 805 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479637/805-30-30-8 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -SubTopic 30 -Topic 805 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479581/805-30-50-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 30 -Paragraph 7 -SubTopic 30 -Topic 805 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479637/805-30-30-7 + Details
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- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479328/805-10-50-2 + Details
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- Definition This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to items of consideration transferred in connection with a business combination for which the initial accounting was incomplete. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 4A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479907/805-20-50-4A + Details
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- Definition Amount of other assets expected to be realized or consumed before one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479907/805-20-50-1 + Details
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- Definition Amount of liabilities incurred for goods and services received that are used in an entity's business and related party payables, assumed at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479907/805-20-50-1 + Details
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- Definition Amount of real estate acquired, at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479907/805-20-50-1 + Details
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- Definition Amount of liabilities assumed at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479907/805-20-50-1 + Details
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- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479303/805-10-55-37 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479907/805-20-50-1 + Details
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- Definition Percentage of ownership of equity interest excluding interest in entity that is consolidated and equity method investee. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 321 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-1 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 805 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479581/805-30-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-13 + Details
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