Supplemental Guarantor Information Income statement (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Jun. 30, 2016	Sep. 30, 2016	Sep. 30, 2015
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Sales	$ 1,337.7		$ 1,454.3		$ 3,695.5	$ 3,890.5
Excise taxes	(390.1)		(436.9)		(1,104.5)	(1,167.4)
Net sales	947.6		1,017.4		2,591.0	2,723.1
Cost of goods sold	(541.3)		(585.9)		(1,517.5)	(1,620.6)
Gross profit	406.3		431.5		1,073.5	1,102.5
Marketing, general and administrative expenses	(278.9)		(265.2)		(843.4)	(789.1)
Special items, net	4.9		(293.5)		79.0	(335.8)
Equity income in MillerCoors	156.9		135.3		491.2	470.1
Operating income (loss)	289.2		8.1		800.3	447.7
Interest income (expense), net	(66.6)		(26.8)		(154.4)	(86.6)
Other income (expense), net	0.8		3.7		(44.9)	7.4
Income (loss) from continuing operations before income taxes	223.4		(15.0)		601.0	368.5
Income tax benefit (expense)	(19.6)	$ 16.7	27.3	$ 37.9	(57.5)	(43.9)
Net Income (loss) from continuing operations	203.8		12.3		543.5	324.6
Income (loss) from discontinued operations, net of tax	0.0		2.9		(2.3)	4.5
Net income (loss) including noncontrolling interests	203.8		15.2		541.2	329.1
Net (income) loss attributable to noncontrolling interests	(1.3)		1.4		(3.7)	(2.4)
Net income (loss) attributable to MCBC	202.5	$ 162.7	16.6	$ 335.0	537.5	326.7
Comprehensive income (loss) attributable to Molson Coors Brewing Company	143.1		(239.4)		599.1	(332.1)
Parent Guarantor and 2012 Issuer [Member]
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Sales	7.0		4.9		20.5	15.9
Excise taxes	0.0		0.0		0.0	0.0
Net sales	7.0		4.9		20.5	15.9
Cost of goods sold	0.0		0.0		0.0	0.0
Gross profit	7.0		4.9		20.5	15.9
Marketing, general and administrative expenses	(50.0)		(28.9)		(148.1)	(87.3)
Special items, net	0.0		0.0		0.0	0.0
Equity income (loss) in subsidiaries	292.8		96.6		737.1	384.8
Equity income in MillerCoors	0.0		0.0		0.0	0.0
Operating income (loss)	249.8		72.6		609.5	313.4
Interest income (expense), net	(54.0)		(16.1)		(126.7)	(49.2)
Other income (expense), net	(21.2)		(0.1)		(61.5)	(1.1)
Income (loss) from continuing operations before income taxes	174.6		56.4		421.3	263.1
Income tax benefit (expense)	27.9		(39.8)		116.2	63.6
Net Income (loss) from continuing operations	202.5		16.6		537.5	326.7
Income (loss) from discontinued operations, net of tax	0.0		0.0		0.0	0.0
Net income (loss) including noncontrolling interests	202.5		16.6		537.5	326.7
Net (income) loss attributable to noncontrolling interests	0.0		0.0		0.0	0.0
Net income (loss) attributable to MCBC	202.5		16.6		537.5	326.7
Comprehensive income (loss) attributable to Molson Coors Brewing Company			(239.4)			(332.1)
Subsidiary Guarantors [Member]
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Sales	560.2		573.6		1,526.2	1,585.8
Excise taxes	(128.1)		(132.0)		(343.9)	(363.0)
Net sales	432.1		441.6		1,182.3	1,222.8
Cost of goods sold	(223.5)		(227.4)		(630.1)	(680.3)
Gross profit	208.6		214.2		552.2	542.5
Marketing, general and administrative expenses	(97.9)		(94.3)		(281.7)	(281.4)
Special items, net	(1.3)		(15.6)		106.6	(23.8)
Equity income (loss) in subsidiaries	(19.4)		(280.7)		(223.7)	(446.1)
Equity income in MillerCoors	156.9		135.3		491.2	470.1
Operating income (loss)	246.9		(41.1)		644.6	261.3
Interest income (expense), net	67.2		70.5		208.0	218.5
Other income (expense), net	12.6		3.4		8.5	4.4
Income (loss) from continuing operations before income taxes	326.7		32.8		861.1	484.2
Income tax benefit (expense)	(65.3)		63.2		(238.6)	(101.1)
Net Income (loss) from continuing operations	261.4		96.0		622.5	383.1
Income (loss) from discontinued operations, net of tax	0.0		0.0		0.0	0.0
Net income (loss) including noncontrolling interests	261.4		96.0		622.5	383.1
Net (income) loss attributable to noncontrolling interests	0.0		0.0		0.0	0.0
Net income (loss) attributable to MCBC	261.4		96.0		622.5	383.1
Comprehensive income (loss) attributable to Molson Coors Brewing Company	220.0		(133.7)		675.2	(221.6)
Subsidiary Non Guarantors [Member]
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Sales	810.1		911.1		2,255.5	2,359.0
Excise taxes	(262.0)		(304.9)		(760.6)	(804.4)
Net sales	548.1		606.2		1,494.9	1,554.6
Cost of goods sold	(350.2)		(388.0)		(973.0)	(992.4)
Gross profit	197.9		218.2		521.9	562.2
Marketing, general and administrative expenses	(138.2)		(147.8)		(434.7)	(438.5)
Special items, net	6.2		(277.9)		(27.6)	(312.0)
Equity income (loss) in subsidiaries	92.1		59.7		329.3	248.9
Equity income in MillerCoors	0.0		0.0		0.0	0.0
Operating income (loss)	158.0		(147.8)		388.9	60.6
Interest income (expense), net	(79.8)		(81.2)		(235.7)	(255.9)
Other income (expense), net	9.4		0.4		8.1	4.1
Income (loss) from continuing operations before income taxes	87.6		(228.6)		161.3	(191.2)
Income tax benefit (expense)	17.8		3.9		64.9	(6.4)
Net Income (loss) from continuing operations	105.4		(224.7)		226.2	(197.6)
Income (loss) from discontinued operations, net of tax	0.0		2.9		(2.3)	4.5
Net income (loss) including noncontrolling interests	105.4		(221.8)		223.9	(193.1)
Net (income) loss attributable to noncontrolling interests	(1.3)		1.4		(3.7)	(2.4)
Net income (loss) attributable to MCBC	104.1		(220.4)		220.2	(195.5)
Comprehensive income (loss) attributable to Molson Coors Brewing Company	86.3		(286.3)		85.3	(337.7)
Consolidated [Member]
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Sales	1,337.7		1,454.3		3,695.5	3,890.5
Excise taxes	(390.1)		(436.9)		(1,104.5)	(1,167.4)
Net sales	947.6		1,017.4		2,591.0	2,723.1
Cost of goods sold	(541.3)		(585.9)		(1,517.5)	(1,620.6)
Gross profit	406.3		431.5		1,073.5	1,102.5
Marketing, general and administrative expenses	(278.9)		(265.2)		(843.4)	(789.1)
Special items, net	4.9		(293.5)		79.0	(335.8)
Equity income (loss) in subsidiaries	0.0		0.0		0.0	0.0
Equity income in MillerCoors	156.9		135.3		491.2	470.1
Operating income (loss)	289.2		8.1		800.3	447.7
Interest income (expense), net	(66.6)		(26.8)		(154.4)	(86.6)
Other income (expense), net	0.8		3.7		(44.9)	7.4
Income (loss) from continuing operations before income taxes	223.4		(15.0)		601.0	368.5
Income tax benefit (expense)	(19.6)		27.3		(57.5)	(43.9)
Net Income (loss) from continuing operations	203.8		12.3		543.5	324.6
Income (loss) from discontinued operations, net of tax	0.0		2.9		(2.3)	4.5
Net income (loss) including noncontrolling interests	203.8		15.2		541.2	329.1
Net (income) loss attributable to noncontrolling interests	(1.3)		1.4		(3.7)	(2.4)
Net income (loss) attributable to MCBC	202.5		16.6		537.5	326.7
Comprehensive income (loss) attributable to Molson Coors Brewing Company			(239.4)			(332.1)
Consolidation, Eliminations [Member]
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Sales	(39.6)		(35.3)		(106.7)	(70.2)
Excise taxes	0.0		0.0		0.0	0.0
Net sales	(39.6)		(35.3)		(106.7)	(70.2)
Cost of goods sold	32.4		29.5		85.6	52.1
Gross profit	(7.2)		(5.8)		(21.1)	(18.1)
Marketing, general and administrative expenses	7.2		5.8		21.1	18.1
Special items, net	0.0		0.0		0.0	0.0
Equity income (loss) in subsidiaries	(365.5)		124.4		(842.7)	(187.6)
Equity income in MillerCoors	0.0		0.0		0.0	0.0
Operating income (loss)	(365.5)		124.4		(842.7)	(187.6)
Interest income (expense), net	0.0		0.0		0.0	0.0
Other income (expense), net	0.0		0.0		0.0	0.0
Income (loss) from continuing operations before income taxes	(365.5)		124.4		(842.7)	(187.6)
Income tax benefit (expense)	0.0		0.0		0.0	0.0
Net Income (loss) from continuing operations	(365.5)		124.4		(842.7)	(187.6)
Income (loss) from discontinued operations, net of tax	0.0		0.0		0.0	0.0
Net income (loss) including noncontrolling interests	(365.5)		124.4		(842.7)	(187.6)
Net (income) loss attributable to noncontrolling interests	0.0		0.0		0.0	0.0
Net income (loss) attributable to MCBC	(365.5)		124.4		(842.7)	(187.6)
Comprehensive income (loss) attributable to Molson Coors Brewing Company	$ (306.3)		$ 420.0		$ (760.5)	$ 559.3