Quarterly report [Sections 13 or 15(d)]

Business Acquisitions and Dispositions - Additional Information (Details)

v3.26.3
Business Acquisitions and Dispositions - Additional Information (Details)
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2026
USD ($)
retail_Units
Mar. 31, 2026
USD ($)
Sep. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
Sep. 30, 2026
USD ($)
retail_Units
retailUnits
Sep. 30, 2025
USD ($)
Business
retail_Units
Dec. 31, 2025
USD ($)
Mid-line import franchise              
Business Combination [Line Items]              
Number of franchises disposed | retail_Units         3    
Business acquisition, consideration amount           $ 440,300,000  
Number of franchises disposed         5 1  
Proceeds from sales of dealerships         $ 40,500,000 $ 9,600,000  
Number of acquired franchises | retail_Units           5  
Business Combination, Recognized Asset Acquired, Inventory, Current $ 30,900,000       30,900,000    
Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment 4,200,000       4,200,000    
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill 71,500,000       71,500,000    
Business Combination, Recognized Liability Assumed, Other Liability, Current (2,300,000)       (2,300,000)    
Payments to Acquire Businesses, Gross         169,300,000    
PY Acq GW Allocations Fdealer             $ (200,000)
PY Acq GW Allocations Powersports       $ 0      
number of powersport stores with GW Adjustment              
Gain on Franchise Disposal         (5,100,000) $ 5,500,000  
GainLossOnExitOfLeasedDealerships (600,000)       600,000    
Impairment charges 0   $ 0   (400,000) (173,800,000)  
Excluded storm-related physical damage and legal costs     2,800,000     5,000,000.0  
Business Combination, Pro Forma Information, Pro Forma Revenue         11,683,700,000    
Business Acquisition, Pro Forma Earnings         224,100,000    
Business Combination, Acquiree's Revenue, Prior Period   $ 15,390,100,000          
Business Acquisition, Earnings Reported by Acquired Entity for Last Annual Period   $ 178,100,000          
Business Combination, Goodwill, Expected Tax Deductible, Amount 81,200,000       81,200,000    
Business Combination, Acquiree's Earnings (Loss) since Acquisition Date, Actual         2,200,000    
Business Combination, Recognized Liability Assumed, Lease Obligation (12,800,000)       (12,800,000)    
Goodwill and Intangible Assets Acquired       $ 64,200,000 9,700,000    
RevenueEarningsIncludedInStatementofOperationsAttributableToAcquisitions         51,800,000    
Payments for Legal Settlements $ (1,000,000.0)   700,000   (1,000,000.0) 700,000  
Proceeds from Divestiture of Businesses         62,700,000    
Proceeds from Sale of Real Estate         22,200,000    
Loss (gain) on disposal of dealerships and property and equipment         (1,100,000) 6,400,000  
Gain (loss) on disposal         $ 5,100,000    
Gain (Loss) on Disposition of Assets     100,000        
Loss Contingency, Damages Sought 0.9 million       2.1 million    
Excluded storm-related physical damage and legal costs     2,800,000     5,000,000.0  
Gain on Franchise Disposal         $ (5,100,000) 5,500,000  
Impairment charges $ 0   $ 0   (400,000) (173,800,000)  
GainLossOnExitOfLeasedDealerships $ (600,000)       600,000    
Payments to Acquire Businesses, Gross         169,300,000    
Disposal Group, Including Discontinued Operations [Line Items]              
Proceeds from sales of property and equipment         $ 22,800,000 49,000,000.0  
Powersports Segment              
number of powersport stores with GW Adjustment              
Significant Changes, Franchised Outlets in Operation | retail_Units 1       1    
ROU asset              
Business Combination [Line Items]              
Restructuring Costs         $ 12,600,000    
JLR 4 Pack [Member]              
Business Combination [Line Items]              
Business Combination, Recognized Asset Acquired, Other Asset, Current $ 200,000       200,000    
Insurance Settlement [Member]              
number of powersport stores with GW Adjustment              
Other Nonrecurring Gain (Loss)           (40,000,000.0)  
Other Nonrecurring Gain (Loss)           (40,000,000.0)  
EchoPark Segment [Member]              
number of powersport stores with GW Adjustment              
GainLossOnExitOfLeasedDealerships         (3,000,000.0)    
GainLossOnExitOfLeasedDealerships         $ (3,000,000.0)    
Powersports Segment              
Business Combination [Line Items]              
Number of acquired franchises | retailUnits         1    
Number of Powersports Stores Acquired | retail_Units         6    
number of powersport stores with GW Adjustment              
Other Asset Impairment Charges           $ 400,000  
Intangible Asset, Impairment, Description           7.2 million  
Powersports Dealerships              
Business Combination [Line Items]              
Payments to Acquire Businesses, Gross         $ 66,200,000    
number of powersport stores with GW Adjustment              
Payments to Acquire Businesses, Gross         66,200,000    
EchoPark Segment [Member]              
number of powersport stores with GW Adjustment              
Impairment charges           $ 200,000  
Impairment charges           200,000  
Franchise              
number of powersport stores with GW Adjustment              
Impairment charges         400,000    
Impairment charges         $ 400,000    
FranchisedDealershipsMember              
Business Combination [Line Items]              
Number of acquired franchises | retailUnits         1    
number of powersport stores with GW Adjustment              
Gain on Franchise Disposal 200,000            
Impairment charges           165,900,000  
Gain on Franchise Disposal 200,000            
Impairment charges           $ 165,900,000  
domestic franchise dealership [Domain]              
Business Combination [Line Items]              
Number of franchises disposed | retail_Units         1    
Number of franchises terminated         1    
Powersports Segment              
number of powersport stores with GW Adjustment              
Business Combination, Recognized Asset Acquired, Asset $ 55,300,000       $ 55,300,000