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Operating Leases - Additional Information (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Store
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Operating Leases [Line Items]      
Non-cancelable operating leases obligation expiration period 2033    
Weighted average remaining lease term 5 years 9 months 18 days    
Number of retail sites leased to third party | Store 391    
Variable lease payments $ 1.8    
Short-term lease payments 0.6    
Operating lease payments $ 25.8    
Lease expense   $ 21.5 $ 21.3
Contingent rent expense   1.9 $ 1.9
Weighted average discount rate 6.90%    
Sublease rental income $ 38.2    
Lessor operating lease term of expiration through 2033    
Deferred rent income under lease agreement $ 7.1 $ 6.3  
Minimum [Member]      
Operating Leases [Line Items]      
Sublease contract term 1 year    
Maximum [Member]      
Operating Leases [Line Items]      
Sublease contract term 10 years