Supplemental Guarantor Information Income statement (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Sales	$ 1,433.0	$ 1,685.9	$ 2,436.2	$ 2,864.2
Excise taxes	(427.3)	(497.4)	(730.5)	(859.7)
Net sales	1,005.7	1,188.5	1,705.7	2,004.5
Cost of goods sold	(579.9)	(683.3)	(1,034.7)	(1,206.5)
Gross profit	425.8	505.2	671.0	798.0
Marketing, general and administrative expenses	(283.3)	(327.8)	(523.9)	(591.7)
Special items, net	(33.7)	(2.7)	(42.3)	49.8
Equity income in MillerCoors	205.5	190.1	334.8	312.9
Operating income (loss)	314.3	364.8	439.6	569.0
Interest income (expense), net	(30.6)	(36.2)	(59.8)	(71.6)
Other income (expense), net	6.3	0.7	3.7	1.5
Income (loss) from continuing operations before income taxes	290.0	329.3	383.5	498.9
Income tax benefit (expense)	(58.4)	(36.4)	(71.2)	(41.2)
Net Income (loss) from continuing operations	231.6	292.9	312.3	457.7
Income (loss) from discontinued operations, net of tax	(0.3)	0.2	1.6	(1.7)
Net income (loss) including noncontrolling interests	231.3	293.1	313.9	456.0
Net (income) loss attributable to noncontrolling interests	(2.3)	(2.2)	(3.8)	(1.7)
Net income (loss) attributable to MCBC	229.0	290.9	310.1	454.3
Comprehensive income (loss) attributable to Molson Coors Brewing Company	463.6	453.4	(92.7)	455.3
Parent Guarantor and 2012 Issuer [Member]
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Sales	6.1	(3.2)	11.0	4.8
Excise taxes	0.0	0.0	0.0	0.0
Net sales	6.1	(3.2)	11.0	4.8
Cost of goods sold	0.0	0.0	0.0	0.0
Gross profit	6.1	(3.2)	11.0	4.8
Marketing, general and administrative expenses	(30.3)	(29.6)	(58.4)	(60.8)
Special items, net	0.0	(0.3)	0.0	(0.3)
Equity income (loss) in subsidiaries	184.0	296.0	288.2	497.4
Equity income in MillerCoors	0.0	0.0	0.0	0.0
Operating income (loss)	159.8	262.9	240.8	441.1
Interest income (expense), net	(15.9)	(22.4)	(33.1)	(43.8)
Other income (expense), net	0.3	2.1	(1.0)	2.4
Income (loss) from continuing operations before income taxes	144.2	242.6	206.7	399.7
Income tax benefit (expense)	84.8	48.3	103.4	54.6
Net Income (loss) from continuing operations	229.0	290.9	310.1	454.3
Income (loss) from discontinued operations, net of tax	0.0	0.0	0.0	0.0
Net income (loss) including noncontrolling interests	229.0	290.9	310.1	454.3
Net (income) loss attributable to noncontrolling interests	0.0	0.0	0.0	0.0
Net income (loss) attributable to MCBC	229.0	290.9	310.1	454.3
Comprehensive income (loss) attributable to Molson Coors Brewing Company	463.6	453.4	(92.7)	455.3
Subsidiary Guarantors [Member]
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Sales	1,082.6	1,262.5	1,906.4	2,213.3
Excise taxes	(348.5)	(405.2)	(605.4)	(710.1)
Net sales	734.1	857.3	1,301.0	1,503.2
Cost of goods sold	(437.8)	(520.8)	(799.1)	(925.5)
Gross profit	296.3	336.5	501.9	577.7
Marketing, general and administrative expenses	(176.5)	(193.7)	(329.5)	(367.5)
Special items, net	1.7	(0.6)	(8.9)	(11.3)
Equity income (loss) in subsidiaries	(67.7)	60.0	(160.1)	26.3
Equity income in MillerCoors	205.5	190.1	334.8	312.9
Operating income (loss)	259.3	392.3	338.2	538.1
Interest income (expense), net	61.2	73.9	120.1	149.7
Other income (expense), net	3.6	1.2	1.3	3.2
Income (loss) from continuing operations before income taxes	324.1	467.4	459.6	691.0
Income tax benefit (expense)	(141.2)	(117.1)	(172.1)	(132.4)
Net Income (loss) from continuing operations	182.9	350.3	287.5	558.6
Income (loss) from discontinued operations, net of tax	0.0	0.0	0.0	0.0
Net income (loss) including noncontrolling interests	182.9	350.3	287.5	558.6
Net (income) loss attributable to noncontrolling interests	0.0	0.0	0.0	0.0
Net income (loss) attributable to MCBC	182.9	350.3	287.5	558.6
Comprehensive income (loss) attributable to Molson Coors Brewing Company	417.9	508.5	(87.5)	602.5
Subsidiary Non Guarantors [Member]
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Sales	351.4	415.0	559.0	674.0
Excise taxes	(78.8)	(92.2)	(125.1)	(149.6)
Net sales	272.6	322.8	433.9	524.4
Cost of goods sold	(137.8)	(147.2)	(253.9)	(290.0)
Gross profit	134.8	175.6	180.0	234.4
Marketing, general and administrative expenses	(87.9)	(108.2)	(157.9)	(182.3)
Special items, net	(35.4)	(1.8)	(33.4)	61.4
Equity income (loss) in subsidiaries	160.5	99.0	184.1	120.2
Equity income in MillerCoors	0.0	0.0	0.0	0.0
Operating income (loss)	172.0	164.6	172.8	233.7
Interest income (expense), net	(75.9)	(87.7)	(146.8)	(177.5)
Other income (expense), net	2.4	(2.6)	3.4	(4.1)
Income (loss) from continuing operations before income taxes	98.5	74.3	29.4	52.1
Income tax benefit (expense)	(2.0)	32.4	(2.5)	36.6
Net Income (loss) from continuing operations	96.5	106.7	26.9	88.7
Income (loss) from discontinued operations, net of tax	(0.3)	0.2	1.6	(1.7)
Net income (loss) including noncontrolling interests	96.2	106.9	28.5	87.0
Net (income) loss attributable to noncontrolling interests	(2.3)	(2.2)	(3.8)	(1.7)
Net income (loss) attributable to MCBC	93.9	104.7	24.7	85.3
Comprehensive income (loss) attributable to Molson Coors Brewing Company	242.2	156.0	(51.6)	134.1
Eliminations [Member]
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Sales	(7.1)	11.6	(40.2)	(27.9)
Excise taxes	0.0	0.0	0.0	0.0
Net sales	(7.1)	11.6	(40.2)	(27.9)
Cost of goods sold	(4.3)	(15.3)	18.3	9.0
Gross profit	(11.4)	(3.7)	(21.9)	(18.9)
Marketing, general and administrative expenses	11.4	3.7	21.9	18.9
Special items, net	0.0	0.0	0.0	0.0
Equity income (loss) in subsidiaries	(276.8)	(455.0)	(312.2)	(643.9)
Equity income in MillerCoors	0.0	0.0	0.0	0.0
Operating income (loss)	(276.8)	(455.0)	(312.2)	(643.9)
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	(276.8)	(455.0)	(312.2)	(643.9)
Income tax benefit (expense)	0.0	0.0	0.0	0.0
Net Income (loss) from continuing operations	(276.8)	(455.0)	(312.2)	(643.9)
Income (loss) from discontinued operations, net of tax	0.0	0.0	0.0	0.0
Net income (loss) including noncontrolling interests	(276.8)	(455.0)	(312.2)	(643.9)
Net (income) loss attributable to noncontrolling interests	0.0	0.0	0.0	0.0
Net income (loss) attributable to MCBC	(276.8)	(455.0)	(312.2)	(643.9)
Comprehensive income (loss) attributable to Molson Coors Brewing Company	(660.1)	(664.5)	139.1	(736.6)
Consolidated [Member]
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Sales	1,433.0	1,685.9	2,436.2	2,864.2
Excise taxes	(427.3)	(497.4)	(730.5)	(859.7)
Net sales	1,005.7	1,188.5	1,705.7	2,004.5
Cost of goods sold	(579.9)	(683.3)	(1,034.7)	(1,206.5)
Gross profit	425.8	505.2	671.0	798.0
Marketing, general and administrative expenses	(283.3)	(327.8)	(523.9)	(591.7)
Special items, net	(33.7)	(2.7)	(42.3)	49.8
Equity income (loss) in subsidiaries	0.0	0.0	0.0	0.0
Equity income in MillerCoors	205.5	190.1	334.8	312.9
Operating income (loss)	314.3	364.8	439.6	569.0
Interest income (expense), net	(30.6)	(36.2)	(59.8)	(71.6)
Other income (expense), net	6.3	0.7	3.7	1.5
Income (loss) from continuing operations before income taxes	290.0	329.3	383.5	498.9
Income tax benefit (expense)	(58.4)	(36.4)	(71.2)	(41.2)
Net Income (loss) from continuing operations	231.6	292.9	312.3	457.7
Income (loss) from discontinued operations, net of tax	(0.3)	0.2	1.6	(1.7)
Net income (loss) including noncontrolling interests	231.3	293.1	313.9	456.0
Net (income) loss attributable to noncontrolling interests	(2.3)	(2.2)	(3.8)	(1.7)
Net income (loss) attributable to MCBC	229.0	290.9	310.1	454.3
Comprehensive income (loss) attributable to Molson Coors Brewing Company	$ 463.6	$ 453.4	$ (92.7)	$ 455.3