Supplemental Guarantor Information Income statement (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Sales	$ 1,003.2	$ 1,178.3
Excise taxes	(303.2)	(362.3)
Net sales	700.0	816.0
Cost of goods sold	(454.8)	(523.2)
Gross profit	245.2	292.8
Marketing, general and administrative expenses	(240.6)	(263.9)
Special items, net	(8.6)	52.5
Equity income in MillerCoors	129.3	122.8
Operating income (loss)	125.3	204.2
Interest income (expense), net	(29.2)	(35.4)
Other income (expense), net	(2.6)	0.8
Income (loss) from continuing operations before income taxes	93.5	169.6
Income tax benefit (expense)	(12.8)	(4.8)
Net Income (loss) from continuing operations	80.7	164.8
Income (loss) from discontinued operations, net of tax	1.9	(1.9)
Net income (loss) including noncontrolling interests	82.6	162.9
Net (income) loss attributable to noncontrolling interests	(1.5)	0.5
Net income (loss) attributable to MCBC	81.1	163.4
Comprehensive income (loss) attributable to Molson Coors Brewing Company	(556.3)	1.9
Parent Guarantor and 2012 Issuer [Member]
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Sales	4.9	8.0
Excise taxes	0	0
Net sales	4.9	8.0
Cost of goods sold	0	0
Gross profit	4.9	8.0
Marketing, general and administrative expenses	(28.1)	(31.2)
Special items, net	0	0
Equity income (loss) in subsidiaries	104.2	201.4
Equity income in MillerCoors	0	0
Operating income (loss)	81.0	178.2
Interest income (expense), net	(17.2)	(21.4)
Other income (expense), net	(1.3)	0.3
Income (loss) from continuing operations before income taxes	62.5	157.1
Income tax benefit (expense)	18.6	6.3
Net Income (loss) from continuing operations	81.1	163.4
Income (loss) from discontinued operations, net of tax	0	0
Net income (loss) including noncontrolling interests	81.1	163.4
Net (income) loss attributable to noncontrolling interests	0	0
Net income (loss) attributable to MCBC	81.1	163.4
Comprehensive income (loss) attributable to Molson Coors Brewing Company	(556.3)	1.9
Subsidiary Guarantors [Member]
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Sales	823.8	950.8
Excise taxes	(256.9)	(304.9)
Net sales	566.9	645.9
Cost of goods sold	(361.3)	(404.7)
Gross profit	205.6	241.2
Marketing, general and administrative expenses	(153.0)	(173.8)
Special items, net	(10.6)	(10.7)
Equity income (loss) in subsidiaries	(92.4)	(33.7)
Equity income in MillerCoors	129.3	122.8
Operating income (loss)	78.9	145.8
Interest income (expense), net	58.9	75.8
Other income (expense), net	(2.3)	2.0
Income (loss) from continuing operations before income taxes	135.5	223.6
Income tax benefit (expense)	(30.9)	(15.3)
Net Income (loss) from continuing operations	104.6	208.3
Income (loss) from discontinued operations, net of tax	0	0
Net income (loss) including noncontrolling interests	104.6	208.3
Net (income) loss attributable to noncontrolling interests	0	0
Net income (loss) attributable to MCBC	104.6	208.3
Comprehensive income (loss) attributable to Molson Coors Brewing Company	(505.4)	94.0
Subsidiary Non Guarantors [Member]
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Sales	207.6	259.0
Excise taxes	(46.3)	(57.4)
Net sales	161.3	201.6
Cost of goods sold	(116.1)	(142.8)
Gross profit	45.2	58.8
Marketing, general and administrative expenses	(70.0)	(74.1)
Special items, net	2.0	63.2
Equity income (loss) in subsidiaries	23.6	21.2
Equity income in MillerCoors	0	0
Operating income (loss)	0.8	69.1
Interest income (expense), net	(70.9)	(89.8)
Other income (expense), net	1.0	(1.5)
Income (loss) from continuing operations before income taxes	(69.1)	(22.2)
Income tax benefit (expense)	(0.5)	4.2
Net Income (loss) from continuing operations	(69.6)	(18.0)
Income (loss) from discontinued operations, net of tax	1.9	(1.9)
Net income (loss) including noncontrolling interests	(67.7)	(19.9)
Net (income) loss attributable to noncontrolling interests	(1.5)	0.5
Net income (loss) attributable to MCBC	(69.2)	(19.4)
Comprehensive income (loss) attributable to Molson Coors Brewing Company	(293.8)	(21.9)
Eliminations [Member]
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Sales	(33.1)	(39.5)
Excise taxes	0	0
Net sales	(33.1)	(39.5)
Cost of goods sold	22.6	24.3
Gross profit	(10.5)	(15.2)
Marketing, general and administrative expenses	10.5	15.2
Special items, net	0	0
Equity income (loss) in subsidiaries	(35.4)	(188.9)
Equity income in MillerCoors	0	0
Operating income (loss)	(35.4)	(188.9)
Interest income (expense), net	0	0
Other income (expense), net	0	0
Income (loss) from continuing operations before income taxes	(35.4)	(188.9)
Income tax benefit (expense)	0	0
Net Income (loss) from continuing operations	(35.4)	(188.9)
Income (loss) from discontinued operations, net of tax	0	0
Net income (loss) including noncontrolling interests	(35.4)	(188.9)
Net (income) loss attributable to noncontrolling interests	0	0
Net income (loss) attributable to MCBC	(35.4)	(188.9)
Comprehensive income (loss) attributable to Molson Coors Brewing Company	799.2	(72.1)
Consolidated [Member]
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Sales	1,003.2	1,178.3
Excise taxes	(303.2)	(362.3)
Net sales	700.0	816.0
Cost of goods sold	(454.8)	(523.2)
Gross profit	245.2	292.8
Marketing, general and administrative expenses	(240.6)	(263.9)
Special items, net	(8.6)	52.5
Equity income (loss) in subsidiaries	0	0
Equity income in MillerCoors	129.3	122.8
Operating income (loss)	125.3	204.2
Interest income (expense), net	(29.2)	(35.4)
Other income (expense), net	(2.6)	0.8
Income (loss) from continuing operations before income taxes	93.5	169.6
Income tax benefit (expense)	(12.8)	(4.8)
Net Income (loss) from continuing operations	80.7	164.8
Income (loss) from discontinued operations, net of tax	1.9	(1.9)
Net income (loss) including noncontrolling interests	82.6	162.9
Net (income) loss attributable to noncontrolling interests	(1.5)	0.5
Net income (loss) attributable to MCBC	81.1	163.4
Comprehensive income (loss) attributable to Molson Coors Brewing Company	$ (556.3)	$ 1.9