Variable Interest Entities - Summary of Assets and Liabilities of Variable Interest Entities (Detail) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Variable Interest Entity [Line Items]
Cash and cash equivalents	$ 688.9	$ 1,803.2	$ 904.7	$ 786.9
Inventories and other current assets, net	196.9	192.8
Advertising fund restricted assets - current	54.0	53.0
Property and equipment, net	2,393.0	2,539.6
Other assets, net	763.6	530.4
Total assets	19,027.7	21,157.4
Other accrued liabilities	76.6	87.5
Advertising fund liabilities - current	48.3	45.6
Other liabilities, net	633.8	634.7
Total liabilities	12,186.4	13,540.1
Equity of VIEs	1,544.5	1,869.7
Total liabilities, redeemable preferred shares and shareholders' equity	19,027.7	21,157.4
VIEs [Member] | Restaurant VIEs [Member]
Variable Interest Entity [Line Items]
Cash and cash equivalents	4.7	5.9
Inventories and other current assets, net	4.3	5.2
Property and equipment, net	8.2	10.7
Other assets, net		0.2
Total assets	17.2	22.0
Notes payable to Tim Hortons Inc. - current	7.4	8.9
Other accrued liabilities	6.1	7.8
Notes payable to Tim Hortons Inc. - long-term	0.2	0.3
Other liabilities, net	1.9	3.9
Total liabilities	15.6	20.9
Equity of VIEs	1.6	1.1
Total liabilities, redeemable preferred shares and shareholders' equity	17.2	22.0
VIEs [Member] | Advertising VIEs [Member]
Variable Interest Entity [Line Items]
Advertising fund restricted assets - current	54.0	53.0
Property and equipment, net	44.1	53.1
Other assets, net	0.2	0.4
Total assets	98.3	106.5
Notes payable to Tim Hortons Inc. - current	10.6	11.4
Other accrued liabilities	0.1	0.1
Advertising fund liabilities - current	48.3	45.6
Notes payable to Tim Hortons Inc. - long-term	37.1	45.5
Other liabilities, net	2.2	3.9
Total liabilities	98.3	106.5
Total liabilities, redeemable preferred shares and shareholders' equity	$ 98.3	$ 106.5