Intangible Assets, net and Goodwill - Schedule of Intangible Assets, net and Goodwill (Detail) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Finite And Indefinite Lived Intangible Assets [Line Items]
Identifiable assets, Gross	$ 1,156.9	$ 1,180.4
Identifiable assets, Accumulated Amortization	(389.6)	(361.7)
Identifiable assets, Net	767.3	818.7
Intangible assets, net	10,736.4	11,062.2
Goodwill	5,619.9	5,782.3
Trade names
Finite And Indefinite Lived Intangible Assets [Line Items]
Indefinite lived intangible assets:	9,969.1	10,243.5
Tim Hortons brand
Finite And Indefinite Lived Intangible Assets [Line Items]
Goodwill	4,168.5	4,325.8
Tim Hortons brand | Trade names
Finite And Indefinite Lived Intangible Assets [Line Items]
Indefinite lived intangible assets:	6,470.8	6,727.1
Burger King brand
Finite And Indefinite Lived Intangible Assets [Line Items]
Goodwill	605.6	610.7
Burger King brand | Trade names
Finite And Indefinite Lived Intangible Assets [Line Items]
Indefinite lived intangible assets:	2,143.4	2,161.5
Popeyes brand
Finite And Indefinite Lived Intangible Assets [Line Items]
Goodwill	845.8	845.8
Popeyes brand | Trade names
Finite And Indefinite Lived Intangible Assets [Line Items]
Indefinite lived intangible assets:	1,354.9	1,354.9
Franchise agreements
Finite And Indefinite Lived Intangible Assets [Line Items]
Identifiable assets, Gross	713.4	724.7
Identifiable assets, Accumulated Amortization	(181.0)	(168.0)
Identifiable assets, Net	532.4	556.7
Favorable leases
Finite And Indefinite Lived Intangible Assets [Line Items]
Identifiable assets, Gross	443.5	455.7
Identifiable assets, Accumulated Amortization	(208.6)	(193.7)
Identifiable assets, Net	$ 234.9	$ 262.0