Supplemental Guarantor Information Income statement (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Sales	$ 950.8	$ 1,003.2
Excise taxes	(293.6)	(303.2)
Net sales	657.2	700.0
Cost of goods sold	(414.0)	(454.8)
Gross profit	243.2	245.2
Marketing, general and administrative expenses	(250.9)	(240.6)
Special items, net	108.6	(8.6)
Equity income in MillerCoors	142.4	129.3
Operating income (loss)	243.3	125.3
Interest income (expense), net	(47.3)	(29.2)
Other income (expense), net	(15.3)	(2.6)
Income (loss) from continuing operations before income taxes	180.7	93.5
Income tax benefit (expense)	(20.6)	(12.8)
Net Income (loss) from continuing operations	160.1	80.7
Income (loss) from discontinued operations, net of tax	(0.5)	1.9
Net income (loss) including noncontrolling interests	159.6	82.6
Net (income) loss attributable to noncontrolling interests	(0.8)	(1.5)
Net income (loss) attributable to MCBC	158.8	81.1
Comprehensive income (loss) attributable to Molson Coors Brewing Company	415.8	(556.3)
Parent Guarantor and 2012 Issuer [Member]
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Sales	6.6	4.9
Excise taxes	0.0	0.0
Net sales	6.6	4.9
Cost of goods sold	0.0	0.0
Gross profit	6.6	4.9
Marketing, general and administrative expenses	(47.0)	(28.1)
Special items, net	0.0	0.0
Equity income (loss) in subsidiaries	215.8	104.2
Equity income in MillerCoors	0.0	0.0
Operating income (loss)	175.4	81.0
Interest income (expense), net	(39.9)	(17.2)
Other income (expense), net	(18.3)	(1.3)
Income (loss) from continuing operations before income taxes	117.2	62.5
Income tax benefit (expense)	41.6	18.6
Net Income (loss) from continuing operations	158.8	81.1
Income (loss) from discontinued operations, net of tax	0.0	0.0
Net income (loss) including noncontrolling interests	158.8	81.1
Net (income) loss attributable to noncontrolling interests	0.0	0.0
Net income (loss) attributable to MCBC	158.8	81.1
Comprehensive income (loss) attributable to Molson Coors Brewing Company		(556.3)
Subsidiary Guarantors [Member]
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Sales	761.4	823.8
Excise taxes	(245.7)	(256.9)
Net sales	515.7	566.9
Cost of goods sold	(319.6)	(361.3)
Gross profit	196.1	205.6
Marketing, general and administrative expenses	(143.4)	(153.0)
Special items, net	108.8	(10.6)
Equity income (loss) in subsidiaries	(105.5)	(92.4)
Equity income in MillerCoors	142.4	129.3
Operating income (loss)	198.4	78.9
Interest income (expense), net	56.2	58.9
Other income (expense), net	3.4	(2.3)
Income (loss) from continuing operations before income taxes	258.0	135.5
Income tax benefit (expense)	(87.8)	(30.9)
Net Income (loss) from continuing operations	170.2	104.6
Income (loss) from discontinued operations, net of tax	0.0	0.0
Net income (loss) including noncontrolling interests	170.2	104.6
Net (income) loss attributable to noncontrolling interests	0.0	0.0
Net income (loss) attributable to MCBC	170.2	104.6
Comprehensive income (loss) attributable to Molson Coors Brewing Company	403.9	(505.4)
Subsidiary Non Guarantors [Member]
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Sales	216.0	207.6
Excise taxes	(47.9)	(46.3)
Net sales	168.1	161.3
Cost of goods sold	(114.2)	(116.1)
Gross profit	53.9	45.2
Marketing, general and administrative expenses	(73.9)	(70.0)
Special items, net	(0.2)	2.0
Equity income (loss) in subsidiaries	141.4	23.6
Equity income in MillerCoors	0.0	0.0
Operating income (loss)	121.2	0.8
Interest income (expense), net	(63.6)	(70.9)
Other income (expense), net	(0.4)	1.0
Income (loss) from continuing operations before income taxes	57.2	(69.1)
Income tax benefit (expense)	25.6	(0.5)
Net Income (loss) from continuing operations	82.8	(69.6)
Income (loss) from discontinued operations, net of tax	(0.5)	1.9
Net income (loss) including noncontrolling interests	82.3	(67.7)
Net (income) loss attributable to noncontrolling interests	(0.8)	(1.5)
Net income (loss) attributable to MCBC	81.5	(69.2)
Comprehensive income (loss) attributable to Molson Coors Brewing Company	104.3	(293.8)
Eliminations [Member]
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Sales	(33.2)	(33.1)
Excise taxes	0.0	0.0
Net sales	(33.2)	(33.1)
Cost of goods sold	19.8	22.6
Gross profit	(13.4)	(10.5)
Marketing, general and administrative expenses	13.4	10.5
Special items, net	0.0	0.0
Equity income (loss) in subsidiaries	(251.7)	(35.4)
Equity income in MillerCoors	0.0	0.0
Operating income (loss)	(251.7)	(35.4)
Interest income (expense), net	0.0	0.0
Other income (expense), net	0.0	0.0
Income (loss) from continuing operations before income taxes	(251.7)	(35.4)
Income tax benefit (expense)	0.0	0.0
Net Income (loss) from continuing operations	(251.7)	(35.4)
Income (loss) from discontinued operations, net of tax	0.0	0.0
Net income (loss) including noncontrolling interests	(251.7)	(35.4)
Net (income) loss attributable to noncontrolling interests	0.0	0.0
Net income (loss) attributable to MCBC	(251.7)	(35.4)
Comprehensive income (loss) attributable to Molson Coors Brewing Company	(508.2)	799.2
Consolidated [Member]
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Sales	950.8	1,003.2
Excise taxes	(293.6)	(303.2)
Net sales	657.2	700.0
Cost of goods sold	(414.0)	(454.8)
Gross profit	243.2	245.2
Marketing, general and administrative expenses	(250.9)	(240.6)
Special items, net	108.6	(8.6)
Equity income (loss) in subsidiaries	0.0	0.0
Equity income in MillerCoors	142.4	129.3
Operating income (loss)	243.3	125.3
Interest income (expense), net	(47.3)	(29.2)
Other income (expense), net	(15.3)	(2.6)
Income (loss) from continuing operations before income taxes	180.7	93.5
Income tax benefit (expense)	(20.6)	(12.8)
Net Income (loss) from continuing operations	160.1	80.7
Income (loss) from discontinued operations, net of tax	(0.5)	1.9
Net income (loss) including noncontrolling interests	159.6	82.6
Net (income) loss attributable to noncontrolling interests	(0.8)	(1.5)
Net income (loss) attributable to MCBC	$ 158.8	81.1
Comprehensive income (loss) attributable to Molson Coors Brewing Company		$ (556.3)