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Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill [Line Items]      
Goodwill $ 1,343.0 $ 1,239.9 $ 1,257.4
Accumulated impairment loss 513.4 513.4 513.4
Finite-lived:      
Gross 472.9 443.4  
Accumulated Amortization 339.9 299.8  
Net 133.0 143.6  
Indefinite-lived:      
Gross 151.0 150.8  
Net 151.0 150.8  
Total intangible assets      
Gross 623.9 594.2  
Accumulated Amortization 339.9 299.8  
Net 284.0 294.4  
Amortization expense related to intangibles 34.6 36.0 $ 32.8
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]      
2018 34.5    
2019 29.7    
2020 24.8    
2021 13.8    
2022 $ 10.2    
Income approach weight for goodwill impairment for certain reporting units 75.00%    
Market approach weight for goodwill impairment for certain reporting units 25.00%    
Minimum      
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]      
Discount rate for goodwill impairment test (as a percent) 10.10%    
Maximum      
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]      
Discount rate for goodwill impairment test (as a percent) 13.30%    
Tradenames      
Indefinite-lived:      
Gross $ 52.0 52.0  
Net 52.0 52.0  
Accumulated impairment loss 139.5 139.5  
Reacquired franchise rights      
Indefinite-lived:      
Gross 99.0 98.8  
Net 99.0 98.8  
Customer relationships      
Finite-lived:      
Gross 453.6 426.2  
Accumulated Amortization 325.2 287.2  
Net $ 128.4 139.0  
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]      
Weighted-average useful lives 13 years    
Other      
Finite-lived:      
Gross $ 19.3 17.2  
Accumulated Amortization 14.7 12.6  
Net $ 4.6 $ 4.6  
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]      
Weighted-average useful lives 4 years