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) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Jul. 07, 2016	May 03, 2012
Comprehensive income (loss) attributable to Molson Coors Brewing Company	$ 571,200,000	$ 36,300,000	$ 847,800,000	$ 456,000,000
Stockholders' Equity Attributable to Parent	12,095,900,000		12,095,900,000		$ 11,418,700,000
Parent Company [Member]
Comprehensive income (loss) attributable to Molson Coors Brewing Company	571,200,000	$ 36,300,000	847,800,000	$ 456,000,000
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	23,716,500,000		23,716,500,000		22,506,300,000
Stockholders' Equity Attributable to Parent	$ 12,095,900,000		$ 12,095,900,000		$ 11,418,700,000
Senior Notes [Member]
Debt Instrument, Face Amount							$ 1,900,000,000
Senior Notes [Member] \| Parent Company [Member] \| Senior Notes Due 2017 $300M 2.0% [Member]
Debt Instrument, Face Amount							$ 300,000,000
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							$ 500,000,000
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							$ 1,100,000,000
Debt instrument, interest rate percentage							5.00%
Senior Notes [Member] \| Parent Company [Member] \| Senior Notes Due 2019 $500M 1.45% [Member]
Debt Instrument, Face Amount						$ 500,000,000
Debt instrument, interest rate percentage						1.45%
Senior Notes [Member] \| Parent Company [Member] \| Senior Notes Due 2021 $1B 2.1% [Member]
Debt Instrument, Face Amount						$ 1,000,000,000.0
Debt instrument, interest rate percentage						2.10%
Senior Notes [Member] \| Parent Company [Member] \| Senior Notes Due 2026 $2B 3.0% [Member]
Debt Instrument, Face Amount						$ 2,000,000,000
Debt instrument, interest rate percentage						3.00%
Senior Notes [Member] \| Parent Company [Member] \| Senior Notes Due 2046 $1.8B 4.2% [Member]
Debt Instrument, Face Amount						$ 1,800,000,000.0
Debt instrument, interest rate percentage						4.20%
Senior Notes [Member] \| Parent Company [Member] \| Senior Notes Due 2024 EUR800M 1.25% [Member]
Debt Instrument, Face Amount						$ 800,000,000
Debt instrument, interest rate percentage						1.25%