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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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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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	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)	Sep. 18, 2015 CAD	May 03, 2012 USD ($)	Oct. 06, 2010 CAD
Comprehensive income (loss) attributable to Molson Coors Brewing Company	$ 143.1	$ (239.4)	$ 599.1	$ (332.1)
Stockholders' Equity Attributable to Parent	9,919.5		9,919.5		$ 7,043.0
Parent Guarantor and 2012 Issuer [Member]
Comprehensive income (loss) attributable to Molson Coors Brewing Company		$ (239.4)		$ (332.1)
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	11,486.4		11,486.4		12,394.3
Stockholders' Equity Attributable to Parent	$ 9,919.5		$ 9,919.5		$ 7,031.0
Senior Notes [Member]
Debt Instrument, Face Amount							$ 1,900.0
Senior Notes [Member] \| Series A notes due 2017 CAD 500 million 3.95% [Member]
Debt Instrument, Face Amount \| CAD								CAD 500,000,000
Debt instrument, interest rate percentage								3.95%
Senior Notes [Member] \| CAD 500 million 2.75% notes due 2020 [Member]
Debt Instrument, Face Amount \| CAD						CAD 500,000,000
Debt instrument, interest rate percentage						2.75%
Senior Notes [Member] \| CAD 400 million 2.25% notes due 2018 [Member]
Debt Instrument, Face Amount \| CAD						CAD 400,000,000
Debt instrument, interest rate percentage						2.25%
Senior Notes [Member] \| Parent Company [Member] \| Senior Notes Due 2017 $300M 2.0% [Member]
Debt Instrument, Face Amount							$ 300.0
Debt instrument, interest rate percentage							2.00%
Senior Notes [Member] \| Parent Company [Member] \| Senior Notes Due 2022 $500M 3.5% [Member]
Debt Instrument, Face Amount							$ 500.0
Debt instrument, interest rate percentage							3.50%
Senior Notes [Member] \| Parent Company [Member] \| Senior Notes Due 2042 $1.1B 5.0% [Member]
Debt Instrument, Face Amount							$ 1,100.0
Debt instrument, interest rate percentage							5.00%