Goodwill and Other Intangible Assets - Goodwill and Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Goodwill [Line Items]
Goodwill	$ 1,291.9	$ 1,239.9
Accumulated impairment loss	513.4	513.4
Finite-lived:
Gross	461.4	443.4
Accumulated Amortization	322.0	299.8
Net	139.4	143.6
Indefinite-lived:
Gross	150.9	150.8
Net	150.9	150.8
Total intangible assets
Gross	612.3	594.2
Accumulated Amortization	322.0	299.8
Net	290.3	294.4
Intangible Assets, Future Amortization Expense by Fiscal Year [Abstract]
Estimated amortization expense, remainder of 2017	17.5
Estimated amortization expense, 2018	32.1
Estimated amortization expense, 2019	27.8
Estimated amortization expense, 2020	22.7
Estimated amortization expense, 2021	12.0
Estimated amortization expense, 2022	8.7
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	98.9	98.8
Net	98.9	98.8
Customer relationships
Finite-lived:
Gross	442.6	426.2
Accumulated Amortization	308.7	287.2
Net	133.9	139.0
Other
Finite-lived:
Gross	18.8	17.2
Accumulated Amortization	13.3	12.6
Net	$ 5.5	$ 4.6