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Goodwill and Other Intangible Assets - Goodwill and Intangible Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Goodwill [Line Items]    
Goodwill $ 1,321.9 $ 1,343.0
Finite-lived:    
Gross 467.3 472.9
Accumulated Amortization 353.5 339.9
Net 113.8 133.0
Indefinite-lived:    
Gross 150.8 151.0
Net 150.8 151.0
Total intangible assets    
Gross 618.1 623.9
Accumulated Amortization 353.5 339.9
Net 264.6 284.0
Accumulated impairment loss 513.4 513.4
Intangible Assets, Future Amortization Expense by Fiscal Year [Abstract]    
Estimated amortization expense, remainder of 2018 16.5  
Estimated amortization expense, 2019 29.3  
Estimated amortization expense, 2020 24.7  
Estimated amortization expense, 2021 13.7  
Estimated amortization expense, 2022 10.1  
Estimated amortization expense, 2023 7.9  
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 98.8 99.0
Net 98.8 99.0
Customer relationships    
Finite-lived:    
Gross 448.6 453.6
Accumulated Amortization 338.0 325.2
Net 110.6 128.4
Other    
Finite-lived:    
Gross 18.7 19.3
Accumulated Amortization 15.5 14.7
Net $ 3.2 $ 4.6