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Non-recurring Charges (Benefits) [Abstract]

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Amount of amortization expense attributable to debt issuance costs.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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Amount after tax of pro forma income from continuing operations as if the business combination had been completed at the beginning of a period.

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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Interest income derived from funds deposited with both domestic and foreign financial institutions including funds in money market and other accounts.

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Amount of the fee for available but unused credit capacity under the credit facility.

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Pending Acquisition - Unaudited Pro Forma Financial Information (Details) - USD ($) $ / shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Non-recurring charges (benefits)
Foreign Currency Transaction Gain (Loss), before Tax	$ (2.2)		$ (2.2)
MillerCoors
Business Acquisition [Line Items]
Net sales	2,944.6	$ 3,003.0	8,515.2	$ 8,660.7
Net Income (loss) from continuing operations	314.3	74.5	918.9	594.1
Net income (loss) attributable to MCBC	$ 314.3	$ 77.4	$ 916.6	$ 598.6
Basic net income (loss) attributable to Molson Coors Brewing Company per share	$ 1,460	$ 350	$ 4,280	$ 2,760
Diluted net income (loss) attributable to Molson Coors Brewing Company per share	$ 1,450	$ 350	$ 4,250	$ 2,740
MillerCoors \| Selling, General and Administrative Expenses [Member]
Non-recurring charges (benefits)
Business Acquisition, Other Transaction Costs	$ 17.2		$ 51.7
MillerCoors \| Interest Income [Member]
Non-recurring charges (benefits)
Interest Income, Deposits with Financial Institutions	(10.6)		(17.0)
Forward Contracts [Member] \| MillerCoors \| Other income (expense), net [Member]
Non-recurring charges (benefits)
Foreign Currency Transaction Gain (Loss), before Tax	(13.8)		(2.2)
Swaption [Member] \| MillerCoors \| Interest Expense [Member]
Non-recurring charges (benefits)
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	0.0		36.4
Bridge Loan \| MillerCoors \| Other income (expense), net [Member]
Non-recurring charges (benefits)
Amortization of Debt Issuance Costs	24.8		63.4
MillerCoors Acquisition Term Loan [Member] \| MillerCoors \| Interest Expense [Member]
Non-recurring charges (benefits)
Line of Credit Facility, Commitment Fee Amount	$ 1.9		$ 5.6