Other Operating Expenses (Income), net - Other Operating Expenses (Income), Net (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Other Income and Expenses [Abstract]
Net losses (gains) on disposal of assets, restaurant closures and refranchisings	$ (5.1)	$ 5.1	$ (2.9)	$ 7.9
Litigation settlements and reserves, net	0.5	2.1	1.7	2.2
Net losses (gains) on derivatives	26.6		41.6
Net losses (gains) on foreign exchange	9.6	(2.9)	25.4	(2.5)
Other, net	2.6	1.1	3.9	2.3
Other operating (income) expenses, net	$ 34.2	$ 5.4	$ 69.7	$ 9.9