Goodwill and Other Intangible Assets - Goodwill and Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Goodwill [Line Items]
Goodwill	$ 1,322.0	$ 1,239.9
Accumulated impairment loss	513.4	513.4
Finite-lived:
Gross	470.4	443.4
Accumulated Amortization	333.3	299.8
Net	137.1	143.6
Indefinite-lived:
Gross	151.0	150.8
Net	151.0	150.8
Total intangible assets
Gross	621.4	594.2
Accumulated Amortization	333.3	299.8
Net	288.1	294.4
Intangible Assets, Future Amortization Expense by Fiscal Year [Abstract]
Estimated amortization expense, remainder of 2017	9.0
Estimated amortization expense, 2018	33.0
Estimated amortization expense, 2019	28.8
Estimated amortization expense, 2020	24.1
Estimated amortization expense, 2021	13.0
Estimated amortization expense, 2022	9.4
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	451.2	426.2
Accumulated Amortization	319.3	287.2
Net	131.9	139.0
Other
Finite-lived:
Gross	19.2	17.2
Accumulated Amortization	14.0	12.6
Net	$ 5.2	$ 4.6