Equity Method Investments - Summary of Franchise and Property Revenue (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenues from affiliates:
Franchise royalties	$ 242.8	$ 182.3	$ 697.8	$ 516.9
Property revenues	191.7	54.3	567.7	162.1
Franchise fees and other revenue	39.3	23.4	116.5	46.3
Total	473.8	260.0	1,382.0	725.3
Affiliates [Member]
Revenues from affiliates:
Franchise royalties	23.0	21.8	67.3	61.6
Property revenues	6.7	7.0	20.9	19.7
Franchise fees and other revenue	2.4	2.2	5.8	5.5
Total	$ 32.1	$ 31.0	$ 94.0	$ 86.8