Share-based Compensation - Summary of Share-based Compensation Expense (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock options, stock options with tandem SARs and RSUs	$ 35.1	$ 50.8	$ 43.1
Accelerated vesting of Tim Hortons RSUs and performance stock units			14.8
Total share-based compensation expense	$ 35.1	$ 50.8	$ 57.9