Debt Table (Details) In Millions, unless otherwise specified	Mar. 30, 2013 USD ($)		Dec. 29, 2012 USD ($)		Jun. 30, 2007 USD ($)	Mar. 30, 2013 Senior Notes [Member] $575 million 2.5% convertible Senior Notes due 2013 USD ($)		Dec. 29, 2012 Senior Notes [Member] $575 million 2.5% convertible Senior Notes due 2013 USD ($)		Jun. 15, 2007 Senior Notes [Member] $575 million 2.5% convertible Senior Notes due 2013 USD ($)	Mar. 30, 2013 Senior Notes [Member] Convertible Senior Unsecured Note Due 2013 €500 Million 0.0% [Member] USD ($)		Dec. 29, 2012 Senior Notes [Member] Convertible Senior Unsecured Note Due 2013 €500 Million 0.0% [Member] USD ($)		Mar. 30, 2013 Senior Notes [Member] Canadian dollar ("CAD") 900 million 5.0% notes due 2015 USD ($)	Dec. 29, 2012 Senior Notes [Member] Canadian dollar ("CAD") 900 million 5.0% notes due 2015 USD ($)	Sep. 22, 2005 Senior Notes [Member] Canadian dollar ("CAD") 900 million 5.0% notes due 2015 USD ($)	Mar. 30, 2013 Senior Notes [Member] CAD 500 million 3.95% Series A notes due 2017 USD ($)	Dec. 29, 2012 Senior Notes [Member] CAD 500 million 3.95% Series A notes due 2017 USD ($)	Oct. 06, 2010 Senior Notes [Member] CAD 500 million 3.95% Series A notes due 2017 USD ($)	Mar. 30, 2013 Senior Notes [Member] $300 million 2.0% notes due 2017 USD ($)	Dec. 29, 2012 Senior Notes [Member] $300 million 2.0% notes due 2017 USD ($)	Mar. 30, 2013 Senior Notes [Member] $500 million 3.5% notes due 2022 USD ($)	Dec. 29, 2012 Senior Notes [Member] $500 million 3.5% notes due 2022 USD ($)	Mar. 30, 2013 Senior Notes [Member] $1.1 billion 5.0% notes due 2042 USD ($)	Dec. 29, 2012 Senior Notes [Member] $1.1 billion 5.0% notes due 2042 USD ($)	May 03, 2012 Senior Notes [Member] 5.0% Interest Rate, Maturing 2042 [Member] USD ($)	Sep. 22, 2005 Senior Notes [Member] 5.0% Interest Rate, Maturing 2042 [Member]	May 03, 2012 Senior Notes [Member] 2.0% Interest Rate, Maturing 2017 [Member] USD ($)	May 03, 2012 Senior Notes [Member] 3.5% Interest Rate, Maturing 2022 [Member] USD ($)	Mar. 30, 2013 Tranch 2 [Member] Term Loan Agreement [Member] USD ($)	Dec. 29, 2012 Tranch 2 [Member] Term Loan Agreement [Member] USD ($)	Apr. 03, 2012 Tranch 2 [Member] Term Loan Agreement [Member] EUR (€)	Mar. 30, 2013 Molson Coors Central Europe (MCCE) Convertible Debt [Member] Zero Coupon Senior Unsecured Note [Member] USD ($)	Jun. 15, 2012 Molson Coors Central Europe (MCCE) Convertible Debt [Member] Zero Coupon Senior Unsecured Note [Member] EUR (€)
Debt Instrument [Line Items]
Total long-term debt (including current portion) before unamortized discounts and other						$ 575.0	[1]	$ 575.0	[1]		$ 678.3	[2]	$ 668.7	[2]	$ 884.6	$ 902.7		$ 491.5	$ 501.5		$ 300.0	$ 300.0	$ 500.0	$ 500.0	$ 1,100.0	$ 1,100.0					$ 120.1	$ 123.9
Other long-term debt	0.4		0.5
Credit facilities	0	[3]	0	[3]
Less: unamortized debt discounts and other	(12.0)		(17.4)
Total long-term debt (including current portion)	4,637.9		4,654.9																															(640.9)
Current portion of long-term debt	(1,247.1)		(1,232.4)
Total long-term debt	3,390.8		3,422.5
Short-term debt	13.3		13.2
Current portion of long-term debt and short-term borrowings	1,260.4		1,245.6
Debt instrument, face amount					$ 575	$ 575				$ 575							$ 900			$ 500							$ 1,100		$ 300	$ 500			€ 120		€ 500
Debt instrument, interest rate percentage						2.50%				2.50%										3.95%							5.00%	5.00%	2.00%	3.50%				0.00%

[1] The original conversion price for each $1,000 aggregate principal amount of notes was $54.76 per share of our Class B common stock, which represented a 25% premium above the stock price on the day of issuance of the notes and corresponded to the initial conversion ratio of 18.263 shares per each $1,000 aggregate principal amount of notes. The conversion ratio and conversion price are subject to adjustments for certain events and provisions, as defined in the indenture, including adjustments reflected for exceeding defined thresholds related to our dividend payments. As of November 2012, our conversion price and ratio are $52.18 and 19.1662 shares, respectively. As of March 30, 2013, the convertible debt's if-converted value does not exceed the principal.During the first quarters of 2013 and 2012, we incurred additional non-cash interest expense of $4.6 million and $4.5 million, respectively. We also incurred interest expense related to the 2.5% convertible coupon rate of $3.6 million and $3.7 million during the first quarters of 2013 and 2012, respectively. The combination of non-cash and cash interest resulted in an effective interest rate of 5.8% and 5.9% for the first quarters of 2013 and 2012, respectively. As of March 30, 2013, and December 29, 2012, $6.2 million and $10.8 million, respectively, of the unamortized debt discount and other balance relates to our $575 million convertible debt. We expect to record additional non-cash interest expense of $6.2 million during the remainder of 2013, thereby increasing the carrying value of the convertible debt to its $575 million face value at maturity in July 2013. As the notes mature in July 2013, the carrying value at March 30, 2013, is included within the current portion of long-term debt.

[2] On June 15, 2012, we issued a €500 million Zero Coupon Senior Unsecured Convertible Note due 2013 (the ''Convertible Note'') to the Seller in conjunction with the closing of the Acquisition. The Convertible Note matures on December 31, 2013, and is a senior unsecured obligation guaranteed by MCBC. The Seller has the ability to exercise a put right with respect to the Convertible Note as of March 14, 2013, (the “First Redemption Date”) and ending on December 19, 2013, for the greater of the principal amount of the Convertible Note or the aggregate cash value of 12,894,044 shares of our Class B Common Stock, as adjusted for certain corporate events. The Convertible Note's embedded conversion feature was determined to meet the definition of a derivative required to be bifurcated and separately accounted for at fair value with changes in fair value recorded in earnings. At issuance, we recorded a liability of $15.2 million related to the conversion feature. The Convertible Note was issued at a discount of $1.3 million, which has been recognized as interest expense over the period from issuance to the First Redemption Date. As of March 30, 2013, the carrying value of the Convertible Note is included within the current portion of long-term debt.The carrying value of the Convertible Note and fair value of the conversion feature at March 30, 2013, were $640.9 million and $37.4 million, respectively. We recognized an unrealized loss of $29.5 million during the first quarter of 2013 related to changes in the fair value of the conversion feature. The non-cash interest, excluding the change in fair value of the convertible feature, resulted in an effective interest rate of 0.25% for the first quarter of 2013. See Note 14, "Derivative Instruments and Hedging Activities" for further discussion of the conversion feature.

[3] (3)In the first quarter of 2013, a $950 million commercial paper program was approved and implemented. The commercial paper program is supported by our $550 million and $400 million revolving credit facilities. As of March 30, 2013, there were no outstanding borrowings under the commercial paper program.In the third quarter of 2012, we entered into a revolving credit agreement ("Euro Credit Agreement") to support our operations in Central Europe within our Europe segment. The Euro Credit Agreement provides for a 1-year revolving credit facility of €150 million on an uncommitted basis. In the second quarter of 2012, we entered into a revolving credit agreement (the ''Credit Agreement''). The Credit Agreement provides for a 4-year revolving credit facility of $550 million. The Credit Agreement contains customary events of default and specified representations and warranties and covenants, including, among other things, covenants that limit our subsidiaries' ability to incur certain additional priority indebtedness, create or permit liens on assets, or engage in mergers or consolidations. In the second quarter of 2011, we entered into an agreement for a 4-year revolving multicurrency credit facility of $400 million, which provides a $100 million sub-facility available for the issuance of letters of credit.There were no outstanding borrowings on any of our credit facilities as of March 30, 2013.