Condensed Consolidating Statements of Cash Flows (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net income (loss)	$ 90.8	$ 75.1	$ 143.8	$ 135.5
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	51.2	15.8	102.1	32.2
(Gain) loss on early extinguishment of debt	39.9		39.6
Amortization of deferred financing costs and debt issuance discount			15.3	30.1
(Income) loss from equity method investments	5.3	5.9	2.5	9.9
Loss (gain) on remeasurement of foreign denominated transactions			27.5	(2.3)
Amortization of defined benefit pension and postretirement items			(0.1)	(1.6)
Net losses (gains) on derivatives			46.6	4.2
Net losses (gains) on refranchisings and dispositions of assets			(0.6)	3.6
Bad debt expense (recoveries), net			0.7	(0.2)
Share-based compensation expense			22.5	6.0
Acquisition accounting impact on cost of sales			0.8
Deferred income taxes			(92.5)	5.0
Changes in current assets and liabilities, excluding acquisitions and dispositions:
Reclassification of restricted cash to cash and cash equivalents			79.2
Trade and notes receivable			59.9	11.4
Inventories and other current assets			5.0	7.7
Accounts and drafts payable			39.3	(8.4)
Accrued advertising			6.2	(13.1)
Other accrued liabilities			35.9	4.8
Other long-term assets and liabilities			(25.5)	(11.7)
Net cash provided by operating activities			508.2	213.1
Cash flows from investing activities:
Payments for property and equipment			(57.0)	(7.2)
Proceeds (payments) from refranchisings, disposition of assets and restaurant closures			10.7	(6.8)
Return of investment on direct financing leases			8.0	7.7
Settlement of derivatives, net			11.5
Other investing activities			2.3	(0.3)
Net cash provided by (used for) investing activities			(24.5)	(6.6)
Cash flows from financing activities:
Proceeds from Senior Notes			1,250.0
Repayments of term debt, Tim Hortons Notes and capital leases			(2,592.4)	(38.3)
Payment of financing costs			(81.3)
Distributions on partnership units			(124.5)
Capital contributions from RBI Inc.			0.5
Other financing activities			(0.7)
Net cash provided by (used for) financing activities			(1,548.4)	(87.6)
Effect of exchange rates on cash and cash equivalents			(52.8)	(1.1)
Increase (decrease) in cash and cash equivalents			(1,117.5)	117.8
Cash and cash equivalents at beginning of period			1,803.2	786.9
Cash and cash equivalents at end of period	685.7	$ 904.7	685.7	$ 904.7
Borrowers [Member]
Cash flows from operating activities:
Net income (loss)	90.8		143.8
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization			102.1
(Gain) loss on early extinguishment of debt	39.9		39.6
Amortization of deferred financing costs and debt issuance discount			15.3
(Income) loss from equity method investments	5.3		2.5
Loss (gain) on remeasurement of foreign denominated transactions			27.5
Amortization of defined benefit pension and postretirement items			(0.1)
Net losses (gains) on derivatives			46.6
Net losses (gains) on refranchisings and dispositions of assets			(0.6)
Bad debt expense (recoveries), net			0.7
Share-based compensation expense			22.5
Acquisition accounting impact on cost of sales			0.8
Deferred income taxes			(92.5)
Changes in current assets and liabilities, excluding acquisitions and dispositions:
Reclassification of restricted cash to cash and cash equivalents			79.2
Trade and notes receivable			59.9
Inventories and other current assets			5.0
Accounts and drafts payable			39.3
Accrued advertising			6.2
Other accrued liabilities			35.9
Other long-term assets and liabilities			(25.5)
Net cash provided by operating activities			508.2
Cash flows from investing activities:
Payments for property and equipment			(57.0)
Proceeds (payments) from refranchisings, disposition of assets and restaurant closures			10.7
Return of investment on direct financing leases			8.0
Settlement of derivatives, net			11.5
Other investing activities			2.3
Net cash provided by (used for) investing activities			(24.5)
Cash flows from financing activities:
Proceeds from Senior Notes			1,250.0
Repayments of term debt, Tim Hortons Notes and capital leases			(2,592.4)
Payment of financing costs			(81.3)
Other financing activities			(0.7)
Intercompany financing			(124.0)
Net cash provided by (used for) financing activities			(1,548.4)
Effect of exchange rates on cash and cash equivalents			(52.8)
Increase (decrease) in cash and cash equivalents			(1,117.5)
Cash and cash equivalents at beginning of period			1,803.2
Cash and cash equivalents at end of period	685.7		685.7
Restaurant Brands International Limited Partnership [Member]
Cash flows from operating activities:
Net income (loss)	90.8		143.8
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in loss (earnings) of consolidated subsidiaries	(90.8)		(143.8)
Cash flows from financing activities:
Distributions on partnership units			(124.5)
Capital contributions from RBI Inc.			0.5
Intercompany financing			124.0
Eliminations [Member]
Cash flows from operating activities:
Net income (loss)	(90.8)		(143.8)
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in loss (earnings) of consolidated subsidiaries	$ 90.8		$ 143.8