Segment Reporting - Schedule of Segment Related Assets and Long Lived Assets (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Long Lived Assets Held-for-sale [Line Items]
Total assets	$ 21,164.0	$ 5,828.5
Long-Lived Assets	2,680.1	964.6
Operating Segments [Member] | Burger King [Member] | BK - U.S. & Canada [Member]
Long Lived Assets Held-for-sale [Line Items]
Total assets	3,124.8	3,718.4
Long-Lived Assets	825.0	875.4
Operating Segments [Member] | Burger King [Member] | BK - EMEA [Member]
Long Lived Assets Held-for-sale [Line Items]
Total assets	1,480.4	1,449.9
Long-Lived Assets	23.3	28.2
Operating Segments [Member] | Burger King [Member] | BK - LAC [Member]
Long Lived Assets Held-for-sale [Line Items]
Total assets	158.5	152.3
Long-Lived Assets	4.0	4.6
Operating Segments [Member] | Burger King [Member] | BK - APAC [Member]
Long Lived Assets Held-for-sale [Line Items]
Total assets	444.0	439.7
Long-Lived Assets	0.2	0.3
Operating Segments [Member] | Tim Hortons [Member]
Long Lived Assets Held-for-sale [Line Items]
Total assets	14,485.3
Long-Lived Assets	1,770.1
Unallocated [Member]
Long Lived Assets Held-for-sale [Line Items]
Total assets	1,471.0	68.2
Long-Lived Assets	$ 57.5	$ 56.1