Supplemental Guarantor Information Supplemental Narrative (Details) In Millions, unless otherwise specified																		3 Months Ended			3 Months Ended			3 Months Ended					3 Months Ended					3 Months Ended
	Jun. 30, 2012 USD ($)		Dec. 31, 2011 USD ($)		Jun. 30, 2007 USD ($)	May 03, 2012 Senior Notes [Member] USD ($)	Jun. 30, 2012 Senior Notes [Member] Convertible Senior Notes Due 2013 $575 Million 2.5% [Member]	Jun. 25, 2011 Senior Notes [Member] Convertible Senior Notes Due 2013 $575 Million 2.5% [Member] USD ($)	Jun. 30, 2012 Senior Notes [Member] Senior Notes due 2012 $850 million 6.375% [Member] USD ($)	Jun. 30, 2012 Senior Notes [Member] Series A notes due 2017 CAD 500 million 3.95% [Member] USD ($)	May 03, 2012 Senior Notes [Member] Series A notes due 2017 CAD 500 million 3.95% [Member]	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 ($)	Jun. 25, 2011 Senior Notes [Member] Issuer 2005 And Issuer 2010 [Member] Senior Notes 4.85 Percent and 5 Percent due 2010 and 2015 [Member] USD ($)	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	Jun. 30, 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 $850 million 6.375% [Member]	May 03, 2012 Senior Notes [Member] Sales Purchase Agreement [Member] Parent Company [Member] USD ($)	Jun. 30, 2012 Line of Credit [Member] years	Jun. 30, 2012 Line of Credit [Member] Revolving Multicurrency Bank Credit Facility [Member] USD ($)	Jun. 25, 2011 Line of Credit [Member] Revolving Multicurrency Bank Credit Facility [Member] USD ($)	Jun. 30, 2012 Revolving Credit [Member] USD ($)	Apr. 03, 2012 Revolving Credit [Member] USD ($)	Jun. 30, 2012 Term Loan Agreement [Member] years	Apr. 03, 2012 Term Loan Agreement [Member] USD ($) Tranches	Apr. 03, 2012 Tranch 1 [Member] Term Loan Agreement [Member] USD ($)	Apr. 03, 2012 Tranch 2 [Member] Term Loan Agreement [Member] USD ($)	Apr. 03, 2012 Tranch 2 [Member] Term Loan Agreement [Member] EUR (€)	Jun. 30, 2012 Minimum [Member] weeks	Jun. 30, 2012 Maximum [Member] weeks	Jun. 15, 2012 Molson Coors Central Europe (MCCE) [Member] USD ($)	Jun. 15, 2012 Molson Coors Central Europe (MCCE) [Member] EUR (€)	Jun. 15, 2012 Molson Coors Central Europe (MCCE) [Member] Senior Notes [Member] USD ($)		Jun. 15, 2012 Molson Coors Central Europe (MCCE) [Member] Senior Notes [Member] EUR (€)	Jun. 15, 2012 Molson Coors Central Europe (MCCE) [Member] Convertible Debt [Member] USD ($)		Jun. 30, 2012 Molson Coors Central Europe (MCCE) [Member] Convertible Debt [Member] Zero Coupon Senior Unsecured Note [Member]	Jun. 15, 2012 Molson Coors Central Europe (MCCE) [Member] Convertible Debt [Member] Zero Coupon Senior Unsecured Note [Member] EUR (€)
Debt Instrument, Face Amount					$ 575	$ 1,900		$ 575	$ 850	$ 500		500	$ 575	$ 300	$ 500	$ 1,100	$ 1,100		$ 300	900			$ 1,900					$ 300		$ 300	$ 150	$ 150	€ 120
Number of Tranches																														2
Debt Instrument, Interest Rate, Stated Percentage							2.50%		6.375%	3.95%	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
Line of Credit Facility, Amount Outstanding	0	[1]	0	[1]																					0		0
Term of credit facility (in years)																										4
Line of Credit Facility, Maximum Borrowing Capacity																										400		550
Business Acquisition, Cost of Acquired Entity, Liabilities Incurred																																				3,400.0	2,700.0	585.0	[2]	500.0	645.9	[3]		500.0
Number of Weeks in Reporting Period																																		13	26
Repayments of Long-term Debt																					$ 850
Debt Instrument, Term																					10			4					4

[1] On April 3, 2012, we also 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 and our subsidiaries' ability to incur certain additional priority indebtedness, create or permit liens on assets, or engage in mergers or consolidations. Debt issuance costs capitalized in connection with the Credit Agreement will be amortized over the life of the facility and total approximately $5 million. There were no outstanding borrowings on our $550 million credit facility as of June 30, 2012. During the second quarter of 2011, we terminated our $750 million revolving multicurrency bank credit facility, which was scheduled to expire in August 2011. Additionally, in connection with this termination, we entered into an agreement for a 4-year revolving multicurrency credit facility of $400 million in the second quarter of 2011, which provides a $100 million sub-facility available for the issuance of letters of credit. We incurred $2.2 million of issuance costs and up-front fees related to this agreement, which are being amortized over the term of the facility. There were no outstanding borrowings on the $400 million credit facility as of June 30, 2012.

[2] According to our agreement with the Seller and in accordance with the terms of the senior debt facility agreement, upon close 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.