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Other Intangible Assets - Schedule of Intangible Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]        
Gross $ 218.2 $ 218.2    
Accumulated Amortization (162.2) (151.4)    
Net 55.9 66.8    
Franchising Rights        
Finite-Lived Intangible Assets [Line Items]        
Gross 214.8 214.8    
Accumulated Amortization (161.8) (151.0)    
Net 53.0 63.8 $ 59.0 $ 69.0
Reacquired Franchise Rights        
Finite-Lived Intangible Assets [Line Items]        
Net 0.0 0.0 5.1 5.7
Favorable leaseholds        
Finite-Lived Intangible Assets [Line Items]        
Gross 3.4 3.4    
Accumulated Amortization (0.5) (0.4)    
Net $ 2.9 $ 3.0 $ 3.1 $ 3.2