Supplemental Guarantor Information Supplemental Table (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		3 Months Ended								6 Months Ended		3 Months Ended								6 Months Ended		3 Months Ended								6 Months Ended		3 Months Ended								6 Months Ended		3 Months Ended
	Jun. 30, 2012	Jun. 25, 2011	Jun. 30, 2012	Jun. 25, 2011	Mar. 31, 2012 Restatement Adjustment [Member]	Mar. 31, 2011 Restatement Adjustment [Member]	Mar. 31, 2012 Scenario, Previously Reported [Member]		Mar. 31, 2011 Scenario, Previously Reported [Member]		Jun. 30, 2012 Parent Guarantor and 2007 Issuer [Member]	Jun. 25, 2011 Parent Guarantor and 2007 Issuer [Member]	Jun. 30, 2012 Parent Guarantor and 2007 Issuer [Member]	Jun. 25, 2011 Parent Guarantor and 2007 Issuer [Member]	Mar. 31, 2012 Parent Guarantor and 2007 Issuer [Member] Restatement Adjustment [Member]	Mar. 31, 2011 Parent Guarantor and 2007 Issuer [Member] Restatement Adjustment [Member]	Mar. 31, 2012 Parent Guarantor and 2007 Issuer [Member] Scenario, Previously Reported [Member]		Mar. 31, 2011 Parent Guarantor and 2007 Issuer [Member] Scenario, Previously Reported [Member]		Jun. 30, 2012 Subsidiary Guarantors	Jun. 25, 2011 Subsidiary Guarantors	Jun. 30, 2012 Subsidiary Guarantors	Jun. 25, 2011 Subsidiary Guarantors	Mar. 31, 2012 Subsidiary Guarantors Restatement Adjustment [Member]	Mar. 31, 2011 Subsidiary Guarantors Restatement Adjustment [Member]	Mar. 31, 2012 Subsidiary Guarantors Scenario, Previously Reported [Member]		Mar. 31, 2011 Subsidiary Guarantors Scenario, Previously Reported [Member]		Jun. 30, 2012 Subsidiary Non-Guarantors	Jun. 25, 2011 Subsidiary Non-Guarantors	Jun. 30, 2012 Subsidiary Non-Guarantors	Jun. 25, 2011 Subsidiary Non-Guarantors	Mar. 31, 2012 Subsidiary Non-Guarantors Restatement Adjustment [Member]	Mar. 31, 2011 Subsidiary Non-Guarantors Restatement Adjustment [Member]	Mar. 31, 2012 Subsidiary Non-Guarantors Scenario, Previously Reported [Member]		Mar. 31, 2011 Subsidiary Non-Guarantors Scenario, Previously Reported [Member]		Jun. 30, 2012 Eliminations	Jun. 25, 2011 Eliminations	Jun. 30, 2012 Eliminations	Jun. 25, 2011 Eliminations	Mar. 31, 2012 Eliminations Restatement Adjustment [Member]	Mar. 31, 2011 Eliminations Restatement Adjustment [Member]	Mar. 31, 2012 Eliminations Scenario, Previously Reported [Member]		Mar. 31, 2011 Eliminations Scenario, Previously Reported [Member]
Comprehensive income attributable to MCBC	$ 55.7	$ 190.1	$ 246.3	$ 443.5	$ 190.6	$ 253.4	$ 190.6	[1]	$ 253.4	[1]	$ 55.7	$ 190.1	$ 246.3	$ 443.5	$ 190.6	$ 253.4	$ 56.1	[1]	$ 113.1	[1]	$ 125.6	$ 44.1	$ 345.0	$ 520.4	$ 219.4	$ 476.3	$ 292.5	[1]	$ 406.4	[1]	$ (4.5)	$ 112.4	$ (105.1)	$ 26.5	$ (100.6)	$ (85.9)	$ (164.6)	[1]	$ (163.7)	[1]	$ (121.1)	$ (156.5)	$ (239.9)	$ (546.9)	$ (118.8)	$ (390.4)	$ 6.6	[1]	$ (102.4)	[1]

[1] Amounts as previously reported within the first quarter 2012 recast GSOs to include Molson Coors Brewing Company (UK) Limited (our primary U.K. operating entity), Golden Acquisition, and Molson Coors Holdings Limited as subsidiary guarantors. Additionally, the corrections to amounts previously reported for the 2002 Issuer are now reflected under the current structure within the subsidiary guarantor activity.