Equity Method Investments - Summary of Franchise and Property Revenues (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues from affiliates:
Franchise royalties	$ 332.8	$ 261.1	$ 883.5	$ 738.7
Property revenues	204.1	194.6	568.4	563.9
Franchise fees and other revenue	40.1	33.6	105.9	96.3
Total	577.0	489.3	1,557.8	1,398.9
Affiliates
Revenues from affiliates:
Franchise royalties	39.2	34.9	121.1	94.2
Property revenues	7.2	6.9	20.1	21.1
Franchise fees and other revenue	3.7	6.8	14.7	14.7
Total	$ 50.1	$ 48.6	$ 155.9	$ 130.0