Other Income and Expense Footnotes (Details) (USD $)	12 Months Ended			0 Months Ended	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 29, 2012	Nov. 08, 2013	Mar. 30, 2013	May 03, 2012	Oct. 06, 2010
Other income and expense [Line Items]
Gain (Loss) on other foreign exchange and derivative activity	$ (12,200,000)	$ (8,400,000)	$ (38,000,000)
Senior Notes
Other income and expense [Line Items]
Debt instrument, face amount						1,900,000,000	500,000,000
Gain on sale of non-operating asset
Other income and expense [Line Items]
Gain on sale of noncontrolling interest				22,300,000
Gain for proceeds received related to non-income-related tax settlement					1,200,000
Gain on sale of non-operating asset | Molson Coors Brewing Company (MCBC)
Other income and expense [Line Items]
Ownership percentage by noncontrolling owners				14.60%
Loss from foreign exchange and derivatives | Molson Coors Central Europe (MCCE)
Other income and expense [Line Items]
Gain (Loss) on foreign currency movements	500,000	(2,400,000)	(23,800,000)
Gain (Loss) on other foreign exchange and derivative activity	(7,100,000)	(500,000)	(1,400,000)
Foreign cash positions and foreign exchange contracts | Molson Coors Central Europe (MCCE)
Other income and expense [Line Items]
Gain (Loss) on other foreign exchange and derivative activity		(4,900,000)
Sale of water rights
Other income and expense [Line Items]
Other nonoperating income			$ 5,200,000