Supplemental Guarantor Information Supplemental Narrative (Details) In Millions, unless otherwise specified																	12 Months Ended			3 Months Ended			6 Months Ended	3 Months Ended			1 Months Ended			3 Months Ended		3 Months Ended		3 Months Ended		3 Months Ended	9 Months Ended
	Sep. 29, 2012 USD ($)		Dec. 31, 2011 USD ($)		Jun. 30, 2007 USD ($)	May 03, 2012 Senior Notes [Member] USD ($)	Sep. 29, 2012 Senior Notes [Member] Convertible Senior Notes Due 2013 $575 Million 2.5% [Member]	Sep. 24, 2011 Senior Notes [Member] Convertible Senior Notes Due 2013 $575 Million 2.5% [Member] USD ($)	Jun. 15, 2007 Senior Notes [Member] Convertible Senior Notes Due 2013 $575 Million 2.5% [Member] USD ($)	Oct. 06, 2010 Senior Notes [Member] Series A notes due 2017 CAD 500 million 3.95% [Member] USD ($)	Oct. 06, 2010 Senior Notes [Member] Series A notes due 2017 CAD 500 million 3.95% [Member] CAD	Jun. 15, 2007 Senior Notes [Member] Parent Company [Member] Convertible Senior Notes Due 2013 $575 Million 2.5% [Member] USD ($)	May 03, 2012 Senior Notes [Member] Parent Company [Member] Senior Notes Due 2017 $300M 2.0% [Member] USD ($)	May 03, 2012 Senior Notes [Member] Parent Company [Member] Senior Notes Due 2022 $500M 3.5% [Member] USD ($)	May 03, 2012 Senior Notes [Member] Parent Company [Member] Senior Notes Due 2042 $1.1B 5.0% [Member] USD ($)	Sep. 22, 2005 Senior Notes [Member] Issuer 2005 And Issuer 2010 [Member] USD ($)	Dec. 25, 2010 Senior Notes [Member] Issuer 2005 And Issuer 2010 [Member] Senior Notes 4.85 Percent and 5 Percent due 2010 and 2015 [Member] USD ($)	Sep. 22, 2005 Senior Notes [Member] Issuer 2005 And Issuer 2010 [Member] Senior Notes 4.85 Percent and 5 Percent due 2010 and 2015 [Member] USD ($)	Sep. 22, 2005 Senior Notes [Member] Issuer 2005 And Issuer 2010 [Member] Series A notes due 2017 CAD 500 million 3.95% [Member] CAD	Sep. 29, 2012 Senior Notes [Member] Issuer 2002 [Member] Senior Notes due 2012 $850 million 6.375% [Member] USD ($) years	May 07, 2002 Senior Notes [Member] Issuer 2002 [Member] Senior Notes due 2012 $850 million 6.375% [Member] USD ($)	May 03, 2012 Senior Notes [Member] Sales Purchase Agreement [Member] Parent Company [Member] USD ($)	Sep. 29, 2012 Line of Credit [Member] years	Jun. 25, 2011 Line of Credit [Member] Revolving Multicurrency Bank Credit Facility [Member] years	Sep. 29, 2012 Line of Credit [Member] Revolving Multicurrency Bank Credit Facility [Member] USD ($)	Sep. 24, 2011 Line of Credit [Member] Revolving Multicurrency Bank Credit Facility [Member] USD ($)	Sep. 29, 2012 Revolving Credit [Member] USD ($) years	Sep. 10, 2012 Revolving Credit [Member] EUR (€)	Apr. 03, 2012 Revolving Credit [Member] USD ($)	Sep. 29, 2012 Term Loan Agreement [Member] years	Apr. 03, 2012 Term Loan Agreement [Member] USD ($) Tranches	Sep. 29, 2012 Tranch 1 [Member] Term Loan Agreement [Member] USD ($)	Apr. 03, 2012 Tranch 1 [Member] Term Loan Agreement [Member] USD ($)	Sep. 29, 2012 Tranch 2 [Member] Term Loan Agreement [Member] EUR (€)	Apr. 03, 2012 Tranch 2 [Member] Term Loan Agreement [Member] EUR (€)	Sep. 29, 2012 Minimum [Member] weeks	Sep. 29, 2012 Maximum [Member] weeks	Jun. 15, 2012 Molson Coors Central Europe (MCCE) USD ($)	Jun. 15, 2012 Molson Coors Central Europe (MCCE) EUR (€)	Jun. 15, 2012 Molson Coors Central Europe (MCCE) Senior Notes [Member] USD ($)		Jun. 15, 2012 Molson Coors Central Europe (MCCE) Senior Notes [Member] EUR (€)	Jun. 15, 2012 Molson Coors Central Europe (MCCE) Convertible Debt [Member] USD ($)		Sep. 29, 2012 Molson Coors Central Europe (MCCE) Convertible Debt [Member] Zero Coupon Senior Unsecured Note [Member]	Jun. 15, 2012 Molson Coors Central Europe (MCCE) Convertible Debt [Member] Zero Coupon Senior Unsecured Note [Member] EUR (€)
Debt instrument, face amount					$ 575	$ 1,900		$ 575	$ 575	$ 500	500	$ 575	$ 300	$ 500	$ 1,100	$ 1,100		$ 300	900		$ 850	$ 1,900						€ 150	$ 300		$ 300		$ 150		€ 120											€ 500
Debt instrument, interest rate percentage							2.50%		2.50%	3.95%	3.95%	2.50%	2.00%	3.50%	5.00%			4.85%	5.00%		6.375%																								0.00%
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities																	300
Credit facility, amount outstanding	0	[1]	0	[1]																					0		0
Line of Credit Facility, Maximum Borrowing Capacity																										400			550
Number of Tranches																															2
Business acquisition, cost of acquired entity, liabilities incurred																																						3,400.0	2,700.0	585.0	[2]	500.0	645.9	[3]		500.0
Repayments of long-term debt																				$ 850.0												$ 150.0		€ 26.0
Number of Weeks in Reporting Period																																				13	39
Debt instrument, term																				10			4	4			1			4

[1] On September 10, 2012, we entered into a revolving credit agreement ("Euro Credit Agreement") to support the operations of our Central Europe segment. The Euro Credit Agreement provides for a 1-year revolving credit facility of €150 million on an uncommitted basis. On April 3, 2012, we entered into a revolving credit agreement (the ''Credit Agreement''). The Credit Agreement provides for a 4-year revolving credit facility of $300 million that was subsequently amended to increase the borrowing limit to $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.In relation to the credit facilities issued in the second quarter and third quarter of 2012, we incurred $5.1 million and $0.4 million, of total issuance costs and up-front fees, respectively, which are being amortized over the terms of each respective facility. There were no outstanding borrowings on these credit facilities as of September 29, 2012.

[2] According to our agreement with the Seller and in accordance with the terms of the senior debt facility agreement, upon the closing of the Acquisition, we immediately repaid pre-existing StarBev third-party debt including accrued interest.

[3] We issued a €500 million Zero Coupon Senior Unsecured Convertible Note due 2013 to the Seller upon close of the Acquisition. See Note 13, "Debt" for further discussion.