Segment Reporting - Schedule of Segment Related Assets and Long Lived Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Long Lived Assets Held-for-sale [Line Items]
Total assets	$ 18,411.1	$ 21,343.0
Long-Lived Assets	2,267.8	2,577.0
Operating Segments [Member] | Tim Hortons [Member]
Long Lived Assets Held-for-sale [Line Items]
Total assets	12,646.8	14,814.4
Long-Lived Assets	1,407.5	1,667.0
Operating Segments [Member] | Burger King [Member]
Long Lived Assets Held-for-sale [Line Items]
Total assets	4,693.1	5,277.6
Long-Lived Assets	860.3	910.0
Unallocated [Member]
Long Lived Assets Held-for-sale [Line Items]
Total assets	$ 1,071.2	$ 1,251.0