Intangible Assets, net and Goodwill - Schedule of Intangible Assets, Net and Goodwill (Details) - USD ($) $ in Millions	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Finite And Indefinite Lived Intangible Assets [Line Items]
Identifiable assets, Gross	$ 1,145.6		$ 1,180.4
Identifiable assets, Accumulated Amortization	(389.1)		(361.7)
Identifiable assets, Net	756.5		818.7
Intangible assets, net	10,821.0	$ 11,062.2	11,062.2
Goodwill	5,680.0	$ 5,782.3	5,782.3
Trade Names
Finite And Indefinite Lived Intangible Assets [Line Items]
Indefinite lived intangible assets:	10,064.5		10,243.5
Tim Hortons
Finite And Indefinite Lived Intangible Assets [Line Items]
Goodwill	4,229.9		4,325.8
Tim Hortons | Trade Names
Finite And Indefinite Lived Intangible Assets [Line Items]
Indefinite lived intangible assets:	6,570.7		6,727.1
Burger King
Finite And Indefinite Lived Intangible Assets [Line Items]
Goodwill	604.3		610.7
Burger King | Trade Names
Finite And Indefinite Lived Intangible Assets [Line Items]
Indefinite lived intangible assets:	2,138.9		2,161.5
Popeyes
Finite And Indefinite Lived Intangible Assets [Line Items]
Goodwill	845.8		845.8
Popeyes | 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	717.1		724.7
Identifiable assets, Accumulated Amortization	(187.7)		(168.0)
Identifiable assets, Net	529.4		556.7
Favorable leases
Finite And Indefinite Lived Intangible Assets [Line Items]
Identifiable assets, Gross	428.5		455.7
Identifiable assets, Accumulated Amortization	(201.4)		(193.7)
Identifiable assets, Net	$ 227.1		$ 262.0