The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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The cash outflow associated with security instruments that either represent a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes repayments of (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c).

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- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Supplemental Guarantor Information Supplemental Narrative (Details) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended				3 Months Ended		6 Months Ended	3 Months Ended		6 Months Ended	3 Months Ended		9 Months Ended													12 Months Ended
	Sep. 28, 2013 USD ($)	Sep. 29, 2012 USD ($)	Sep. 28, 2013 USD ($)	Sep. 29, 2012 USD ($)	Dec. 29, 2012 USD ($)	Jun. 30, 2007 USD ($)	Jun. 29, 2013 As Reported [Member] USD ($)	Mar. 30, 2013 As Reported [Member] USD ($)	Jun. 29, 2013 As Reported [Member] USD ($)	Jun. 29, 2013 As Adjusted [Member] USD ($)	Mar. 30, 2013 As Adjusted [Member] USD ($)	Jun. 29, 2013 As Adjusted [Member] USD ($)	Sep. 28, 2013 Parent Guarantor, 2007 and 2012 Issuer [Member] USD ($)	Sep. 29, 2012 Parent Guarantor, 2007 and 2012 Issuer [Member] USD ($)	Sep. 28, 2013 Parent Guarantor, 2007 and 2012 Issuer [Member] USD ($)	Sep. 29, 2012 Parent Guarantor, 2007 and 2012 Issuer [Member] USD ($)	Dec. 29, 2012 Parent Guarantor, 2007 and 2012 Issuer [Member] USD ($)	Dec. 29, 2012 Parent Guarantor, 2007 and 2012 Issuer [Member] As Reported [Member] USD ($)	May 03, 2012 Senior Notes [Member] USD ($)	Sep. 28, 2013 Senior Notes [Member] Convertible Senior Notes Due 2013 $575 Million 2.5% [Member]	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 ($)	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
Debt instrument, face amount						$ 575.0													$ 1,900.0		$ 575.0	$ 500.0	$ 575.0	$ 300.0	$ 500.0	$ 1,100.0	$ 1,100.0		$ 300.0	900.0
Comprehensive income (loss) attributable to Molson Coors Brewing Company	403.7	461.7	369.3	708.0			225.9	(206.2)	19.7	191.2	(225.6)	(34.4)	403.7	461.7	369.3	708.0
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures													12,422.0		12,422.0		10,465.2	11,342.2
Stockholders' Equity Attributable to Parent	8,290.6		8,290.6		7,966.9								8,290.6		8,290.6		7,966.9	8,843.9
Debt instrument, interest rate percentage																				2.50%	2.50%	3.95%	2.50%	2.00%	3.50%	5.00%			4.85%	5.00%
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities																												$ 300