Goodwill and Other Intangible Assets - Goodwill and Intangible Assets (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Goodwill [Line Items]
Goodwill	$ 1,293.6	$ 1,297.1
Finite-lived:
Gross	461.2	463.3
Accumulated Amortization	373.8	367.7
Net	87.4	95.6
Indefinite-lived:
Gross	150.8	150.7
Net	150.8	150.7
Total intangible assets
Gross	612.0	614.0
Accumulated Amortization	373.8	367.7
Net	238.2	246.3
Goodwill, accumulated impairment loss	513.4	513.4
Intangible Assets, Future Amortization Expense by Fiscal Year [Abstract]
Estimated amortization expense, remainder of 2019	21.6
Estimated amortization expense, 2020	24.1
Estimated amortization expense, 2021	13.2
Estimated amortization expense, 2022	9.7
Estimated amortization expense, 2023	7.6
Estimated amortization expense, 2024	6.3
Tradenames
Indefinite-lived:
Gross	52.0	52.0
Net	52.0	52.0
Total intangible assets
Indefinite-lived, accumulated impairment loss	139.5	139.5
Reacquired franchise rights
Indefinite-lived:
Gross	98.8	98.7
Net	98.8	98.7
Customer relationships
Finite-lived:
Gross	443.1	444.8
Accumulated Amortization	357.5	351.7
Net	85.6	93.1
Other
Finite-lived:
Gross	18.1	18.5
Accumulated Amortization	16.3	16.0
Net	$ 1.8	$ 2.5