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Summary of Significant Accounting Policies - Concentration of Credit Risk (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Concentration of Credit Risk      
Amount in excess of FDIC limits $ 278.7 $ 188.1  
Revenue      
Number of past years 8 years 8 years  
Amount of chargebacks included in the estimate of variable consideration $ 68.8 $ 58.9  
Lifetime memberships period 18 years    
Advertising Expense      
Advertising expenses $ 136.3 $ 96.3 $ 117.8
Shipping and Handling Fees and Costs      
Cost, Product and Service [Extensible List] Shipping and Handling Shipping and Handling Shipping and Handling
Contracts in Transit      
Number of days for retail installment sales contracts funded after the initial approval of the retail installment sales contract by third party lender 10 days    
Building and improvements      
Property and Equipment, net      
Estimated useful lives 40    
Minimum      
Revenue      
Stated period of time for insurance and service contracts 1 year    
Minimum | Leasehold improvements      
Property and Equipment, net      
Estimated useful lives 3    
Minimum | Furniture and equipment      
Property and Equipment, net      
Estimated useful lives 3    
Minimum | Software      
Property and Equipment, net      
Estimated useful lives 3    
Maximum      
Revenue      
Stated period of time for insurance and service contracts 5 years    
Maximum | Leasehold improvements      
Property and Equipment, net      
Estimated useful lives 40    
Maximum | Furniture and equipment      
Property and Equipment, net      
Estimated useful lives 12    
Maximum | Software      
Property and Equipment, net      
Estimated useful lives 5    
RV and Outdoor Retail | Shipping and Handling      
Shipping and Handling Fees and Costs      
Cost of Goods and Services Sold $ 8.0 $ 8.2 $ 6.2