Quarterly report [Sections 13 or 15(d)]

Business Acquisitions and Dispositions - Additional Information (Details)

v3.25.3
Business Acquisitions and Dispositions - Additional Information (Details)
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
Mar. 31, 2025
USD ($)
Sep. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
Sep. 30, 2025
USD ($)
retail_Units
Sep. 30, 2024
USD ($)
Business
retail_Units
Dec. 31, 2024
USD ($)
Mid-line import franchise              
Business Combination [Line Items]              
Number of franchises disposed | retail_Units         1    
Net cash generated from disposition           $ 8,200,000  
Luxury Dealership [Domain]              
Business Combination [Line Items]              
Number of franchises disposed | retail_Units           2  
Number of franchises disposed | Business           2  
Net cash generated from disposition         $ 9,600,000    
Number of franchises terminated | retail_Units         1    
Proceeds from sales of dealerships         $ 9,600,000 $ 8,200,000  
Number of acquired franchises | retail_Units           0  
Business Combination, Recognized Asset Acquired, Inventory, Current $ 165,500,000       165,500,000    
Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment 9,400,000       9,400,000    
Business Combination, Recognized Liability Assumed, Other Liability, Current (1,200,000)       (1,200,000)    
PY Acq GW Allocations Fdealer         1,100,000   $ 93,500,000
PY Acq GW Allocations Powersports       $ 0 500,000    
number of powersport stores with GW Adjustment              
Gain on Franchise Disposal 100,000       5,500,000    
Excluded non-recurring compensation-related charges     $ 1,800,000        
GainLossOnExitOfLeasedDealerships     2,300,000     $ (3,000,000.0)  
Impairment charges 0   0   (173,800,000) (2,400,000)  
Excluded storm-related physical damage and legal costs     1,500,000   5,000,000.0 5,100,000  
Business Combination, Pro Forma Information, Pro Forma Revenue         11,639,700,000    
Business Acquisition, Pro Forma Earnings         110,200,000    
Business Combination, Acquiree's Revenue, Prior Period   $ 14,861,900,000          
Business Acquisition, Earnings Reported by Acquired Entity for Last Annual Period   $ 288,100,000          
Business Combination, Goodwill, Expected Tax Deductible, Amount 261,100,000       261,100,000    
Business Combination, Acquisition-Related Cost, Expense         0    
Business Combination, Acquiree's Earnings (Loss) since Acquisition Date, Actual         3,500,000    
Business Combination, Recognized Liability Assumed, Lease Obligation (85,500,000)       (85,500,000)    
Goodwill and Intangible Assets Acquired       $ 11,400,000 263,900,000    
RevenueEarningsIncludedInStatementofOperationsAttributableToAcquisitions         137,600,000    
Payments for Legal Settlements 700,000       700,000    
Excluded non-recurring compensation-related charges     1,800,000        
Excluded storm-related physical damage and legal costs     1,500,000   5,000,000.0 5,100,000  
Gain on Franchise Disposal 100,000       5,500,000    
Impairment charges 0   0   (173,800,000) (2,400,000)  
GainLossOnExitOfLeasedDealerships     $ 2,300,000     (3,000,000.0)  
ROU asset              
Business Combination [Line Items]              
Restructuring Costs         86,200,000    
JLR 4 Pack [Member]              
Business Combination [Line Items]              
Business Combination, Recognized Asset Acquired, Other Asset, Current 2,000,000.0       2,000,000.0    
Payments to Acquire Businesses, Gross         (440,300,000)    
number of powersport stores with GW Adjustment              
Payments to Acquire Businesses, Gross         (440,300,000)    
CDK Outage Impact [Member]              
number of powersport stores with GW Adjustment              
Excluded non-recurring compensation-related charges           13,000,000.0  
Excluded non-recurring compensation-related charges           13,000,000.0  
FranchisedDealershipsMember              
number of powersport stores with GW Adjustment              
Gain on Franchise Disposal 2,800,000            
Gain on Franchise Disposal $ 2,800,000            
Powersports Segment              
number of powersport stores with GW Adjustment              
Impairment charges         7,200,000    
Other Asset Impairment Charges         400,000    
Impairment charges         7,200,000    
EchoPark Segment [Member]              
number of powersport stores with GW Adjustment              
Impairment charges         200,000 1,400,000  
Impairment charges         $ 200,000 1,400,000  
EchoPark Segment [Member] | CDK Outage Impact [Member]              
number of powersport stores with GW Adjustment              
Excluded non-recurring compensation-related charges           400,000  
Excluded non-recurring compensation-related charges           $ 400,000