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Operating Leases - Additional Information (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Store
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Operating Leases [Line Items]      
Non-cancelable operating leases obligation expiration period 2033    
Weighted average remaining lease term 5 years 7 months 6 days    
Number of retail sites leased to third party | Store 465    
Variable lease payments $ 2.3 $ 1.8  
Short-term lease payments 0.8 0.6  
Operating lease payments $ 33.1 25.8  
Lease expense     $ 21.5
Contingent rent expense     1.9
Weighted average discount rate 6.70%    
Number of company operated sites | Store 108    
Sublease rental income $ 34.8 38.2 $ 37.1
Lessor operating lease term of expiration through 2032    
Deferred rent income under lease agreement $ 5.3 $ 7.1  
Minimum [Member]      
Operating Leases [Line Items]      
Sublease contract term 1 year    
Maximum [Member]      
Operating Leases [Line Items]      
Sublease contract term 10 years