Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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-Name Regulation S-X (SX)

-Number 210

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Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

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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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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)	3 Months Ended			3 Months Ended									12 Months Ended
	Mar. 31, 2015 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2014 USD ($)	Mar. 31, 2015 Parent Guarantor and 2012 Issuer [Member] USD ($)	Mar. 31, 2014 Parent Guarantor and 2012 Issuer [Member] USD ($)	Dec. 31, 2014 Parent Guarantor and 2012 Issuer [Member] USD ($)	May 03, 2012 Senior Notes [Member] USD ($)	Oct. 06, 2010 Senior Notes [Member] Series A notes due 2017 CAD 500 million 3.95% [Member] USD ($)	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							$ 1,900,000,000	$ 500,000,000	$ 300,000,000	$ 500,000,000	$ 1,100,000,000	$ 1,100,000,000		$ 300,000,000	900,000,000
Comprehensive income (loss) attributable to Molson Coors Brewing Company	(556,300,000)us-gaap_ComprehensiveIncomeNetOfTax	1,900,000us-gaap_ComprehensiveIncomeNetOfTax		(556,300,000)	1,900,000
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures				12,054,700,000		12,582,800,000
Stockholders' Equity Attributable to Parent	7,261,100,000us-gaap_StockholdersEquity		7,863,300,000us-gaap_StockholdersEquity	7,261,100,000		7,863,300,000
Debt instrument, interest rate percentage								3.95%	2.00%	3.50%	5.00%			4.85%	5.00%
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities													$ 300,000,000