Goodwill and Intangible Assets Intangible Assets (Details)	12 Months Ended			12 Months Ended			12 Months Ended						12 Months Ended						12 Months Ended							12 Months Ended									3 Months Ended								3 Months Ended				12 Months Ended	3 Months Ended
	Dec. 31, 2013 USD ($)	Dec. 29, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2013 Brands USD ($)	Dec. 29, 2012 Brands USD ($)	Jun. 15, 2012 Brands USD ($)	Dec. 31, 2013 Brands Minimum	Dec. 29, 2012 Brands Minimum	Dec. 31, 2013 Brands Maximum	Dec. 29, 2012 Brands Maximum	Dec. 31, 2013 Distribution rights USD ($)	Dec. 29, 2012 Distribution rights USD ($)	Dec. 31, 2013 Distribution rights Minimum	Dec. 29, 2012 Distribution rights Minimum	Dec. 31, 2013 Distribution rights Maximum	Dec. 29, 2012 Distribution rights Maximum	Dec. 31, 2013 Patents and technology and distribution channels USD ($)	Dec. 29, 2012 Patents and technology and distribution channels USD ($)	Dec. 31, 2013 Patents and technology and distribution channels Minimum	Dec. 29, 2012 Patents and technology and distribution channels Minimum	Dec. 31, 2013 Patents and technology and distribution channels Maximum	Dec. 29, 2012 Patents and technology and distribution channels Maximum	Dec. 31, 2013 Favorable contracts, land use rights and other USD ($)	Dec. 29, 2012 Favorable contracts, land use rights and other USD ($)	Jun. 15, 2012 Favorable contracts, land use rights and other USD ($)	Dec. 31, 2013 Favorable contracts, land use rights and other Minimum	Dec. 29, 2012 Favorable contracts, land use rights and other Minimum	Dec. 31, 2013 Favorable contracts, land use rights and other Maximum	Dec. 29, 2012 Favorable contracts, land use rights and other Maximum	Dec. 31, 2013 Distribution networks USD ($)	Dec. 29, 2012 Distribution networks USD ($)	Dec. 31, 2013 Other USD ($)	Dec. 29, 2012 Other USD ($)	Dec. 31, 2013 Jelen Ozujsko Branik USD ($)	Dec. 31, 2013 Ostravar	Dec. 31, 2013 Molson Core Brand USD ($)	Dec. 31, 2013 Europe(1) USD ($)	Dec. 29, 2012 Europe(1) USD ($)	Dec. 31, 2011 Europe(1) USD ($)	Dec. 31, 2013 Canada USD ($)	Dec. 29, 2012 Canada USD ($)	Dec. 31, 2011 Canada USD ($)	Sep. 30, 2012 MC Si Hai USD ($)	Jun. 30, 2012 MC Si Hai USD ($)	Dec. 31, 2013 License Agreement USD ($)	Dec. 31, 2013 License Agreement CAD	Dec. 31, 2013 License Agreement Canada USD ($)	Dec. 31, 2013 Software abandonment Canada
Intangible assets subject to amortization:
Gross				$ 537,500,000	$ 480,600,000						$ 314,100,000	$ 350,800,000					$ 36,200,000	$ 35,300,000					$ 1,200,000	$ 13,600,000
Accumulated amortization	(513,700,000)	(497,200,000)		(224,700,000)	(205,700,000)						(255,000,000)	(255,000,000)					(32,800,000)	(31,100,000)					(1,200,000)	(5,400,000)
Net				312,800,000	274,900,000						59,100,000	95,800,000					3,400,000	4,200,000					0	8,200,000																					38,600,000	41,000,000
Intangible assets not subject to amortization:
Indefinite-lived intangibles				5,482,300,000	5,821,600,000																									952,300,000	1,014,700,000	15,200,000	15,400,000	1,310,900,000		2,857,900,000
Total Gross	7,338,800,000	7,732,000,000
Total Net	6,825,100,000	7,234,800,000
Loss on impairment of finite-lived intangible assets																																															17,900,000
Finite-lived intangible assets, fair value						145,600,000																			12,000,000
Useful life, minimum				30 years			3 years	3 years	40 years	40 years			2 years	2 years	23 years	23 years			3 years	3 years	10 years	10 years	1 year 6 months			2 years	2 years	42 years	42 years						29 years													3 years
Indefinite-lived intangible assets, fair value						2,323,400,000
Percentage of fair value exceeding carrying value				10.00%																														1.00%			11.00%			16.00%
Goodwill	2,418,700,000	2,453,100,000	1,453,300,000																																		1,693,200,000	1,680,900,000	746,100,000	718,200,000	764,000,000	689,500,000
Loss on goodwill impairment	0	0																																										9,500,000
Asset impairment charges																																											$ 27,600,000	$ 10,400,000