Acquisition of Molson Coors Central Europe - General (Details) In Millions, unless otherwise specified		0 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2012 Staropramen [Member] Countries	Jun. 30, 2012 StarBev L.P. (MCCE) [Member] Breweries	Jun. 30, 2012 StarBev L.P. (MCCE) [Member] USD ($)	Jun. 30, 2012 StarBev L.P. (MCCE) [Member] USD ($)	Dec. 31, 2011 StarBev L.P. (MCCE) [Member] hectoliters	Jun. 15, 2012 StarBev L.P. (MCCE) [Member] USD ($)	Jun. 15, 2012 StarBev L.P. (MCCE) [Member] EUR (€)
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Liabilities Incurred						$ 3,400.0	€ 2,700.0
Number of breweries acquired		9
Annual amount of beer brewed					13,300,000
Number of Countries in which Entity Operates	30
Business acquisition-related costs			$ 25.3	$ 31.4