Supplemental Guarantor Information Income statement (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Sales	$ 1,454.3	$ 1,650.0	$ 3,890.5	$ 4,514.2
Excise taxes	(436.9)	(482.0)	(1,167.4)	(1,341.7)
Net sales	1,017.4	1,168.0	2,723.1	3,172.5
Cost of goods sold	(585.9)	(666.6)	(1,620.6)	(1,873.1)
Gross profit	431.5	501.4	1,102.5	1,299.4
Marketing, general and administrative expenses	(265.2)	(289.6)	(789.1)	(881.3)
Special items, net	(293.5)	(367.6)	(335.8)	(317.8)
Equity income in MillerCoors	135.3	158.9	470.1	471.8
Operating income (loss)	8.1	3.1	447.7	572.1
Interest income (expense), net	(26.8)	(31.3)	(86.6)	(102.9)
Other income (expense), net	3.7	(5.0)	7.4	(3.5)
Income (loss) from continuing operations before income taxes	(15.0)	(33.2)	368.5	465.7
Income tax benefit (expense)	27.3	(0.7)	(43.9)	(41.9)
Net Income (loss) from continuing operations	12.3	(33.9)	324.6	423.8
Income (loss) from discontinued operations, net of tax	2.9	1.3	4.5	(0.4)
Net income (loss) including noncontrolling interests	15.2	(32.6)	329.1	423.4
Net (income) loss attributable to noncontrolling interests	1.4	(1.8)	(2.4)	(3.5)
Net income (loss) attributable to MCBC	16.6	(34.4)	326.7	419.9
Comprehensive income (loss) attributable to Molson Coors Brewing Company	(239.4)	(515.9)	(332.1)	(60.6)
Parent Guarantor and 2012 Issuer [Member]
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Sales	4.9	6.5	15.9	11.3
Excise taxes	0.0	0.0	0.0	0.0
Net sales	4.9	6.5	15.9	11.3
Cost of goods sold	0.0	0.0	0.0	0.0
Gross profit	4.9	6.5	15.9	11.3
Marketing, general and administrative expenses	(28.9)	(27.9)	(87.3)	(88.7)
Special items, net	0.0	0.0	0.0	(0.3)
Equity income (loss) in subsidiaries	96.6	4.3	384.8	501.7
Equity income in MillerCoors	0.0	0.0	0.0	0.0
Operating income (loss)	72.6	(17.1)	313.4	424.0
Interest income (expense), net	(16.1)	(17.2)	(49.2)	(61.0)
Other income (expense), net	(0.1)	(1.1)	(1.1)	1.3
Income (loss) from continuing operations before income taxes	56.4	(35.4)	263.1	364.3
Income tax benefit (expense)	(39.8)	1.0	63.6	55.6
Net Income (loss) from continuing operations	16.6	(34.4)	326.7	419.9
Income (loss) from discontinued operations, net of tax	0.0	0.0	0.0	0.0
Net income (loss) including noncontrolling interests	16.6	(34.4)	326.7	419.9
Net (income) loss attributable to noncontrolling interests	0.0	0.0	0.0	0.0
Net income (loss) attributable to MCBC	16.6	(34.4)	326.7	419.9
Comprehensive income (loss) attributable to Molson Coors Brewing Company		(515.9)		(60.6)
Subsidiary Guarantors [Member]
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Sales	1,109.9	1,290.6	3,016.3	3,503.9
Excise taxes	(354.3)	(394.1)	(959.7)	(1,104.2)
Net sales	755.6	896.5	2,056.6	2,399.7
Cost of goods sold	(439.5)	(505.9)	(1,238.6)	(1,431.4)
Gross profit	316.1	390.6	818.0	968.3
Marketing, general and administrative expenses	(169.7)	(196.5)	(499.2)	(564.0)
Special items, net	(17.9)	(11.1)	(26.9)	(22.4)
Equity income (loss) in subsidiaries	(294.3)	(405.0)	(454.4)	(378.7)
Equity income in MillerCoors	135.3	158.9	470.1	471.8
Operating income (loss)	(30.5)	(63.1)	307.6	475.0
Interest income (expense), net	56.7	74.2	176.8	223.9
Other income (expense), net	3.2	(2.9)	4.5	0.3
Income (loss) from continuing operations before income taxes	29.4	8.2	488.9	699.2
Income tax benefit (expense)	66.2	(2.3)	(105.9)	(134.7)
Net Income (loss) from continuing operations	95.6	5.9	383.0	564.5
Income (loss) from discontinued operations, net of tax	0.0	0.0	0.0	0.0
Net income (loss) including noncontrolling interests	95.6	5.9	383.0	564.5
Net (income) loss attributable to noncontrolling interests	0.0	0.0	0.0	0.0
Net income (loss) attributable to MCBC	95.6	5.9	383.0	564.5
Comprehensive income (loss) attributable to Molson Coors Brewing Company	(134.2)	(477.7)	(221.7)	124.8
Subsidiary Non Guarantors [Member]
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Sales	378.2	407.8	937.2	1,081.8
Excise taxes	(82.6)	(87.9)	(207.7)	(237.5)
Net sales	295.6	319.9	729.5	844.3
Cost of goods sold	(172.4)	(200.4)	(426.3)	(490.4)
Gross profit	123.2	119.5	303.2	353.9
Marketing, general and administrative expenses	(79.3)	(80.4)	(237.2)	(262.7)
Special items, net	(275.6)	(356.5)	(308.9)	(295.1)
Equity income (loss) in subsidiaries	73.1	141.5	257.2	261.7
Equity income in MillerCoors	0.0	0.0	0.0	0.0
Operating income (loss)	(158.6)	(175.9)	14.3	57.8
Interest income (expense), net	(67.4)	(88.3)	(214.2)	(265.8)
Other income (expense), net	0.6	(1.0)	4.0	(5.1)
Income (loss) from continuing operations before income taxes	(225.4)	(265.2)	(195.9)	(213.1)
Income tax benefit (expense)	0.9	0.6	(1.6)	37.2
Net Income (loss) from continuing operations	(224.5)	(264.6)	(197.5)	(175.9)
Income (loss) from discontinued operations, net of tax	2.9	1.3	4.5	(0.4)
Net income (loss) including noncontrolling interests	(221.6)	(263.3)	(193.0)	(176.3)
Net (income) loss attributable to noncontrolling interests	1.4	(1.8)	(2.4)	(3.5)
Net income (loss) attributable to MCBC	(220.2)	(265.1)	(195.4)	(179.8)
Comprehensive income (loss) attributable to Molson Coors Brewing Company	(286.1)	(481.0)	(337.6)	(346.9)
Eliminations [Member]
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Sales	(38.7)	(54.9)	(78.9)	(82.8)
Excise taxes	0.0	0.0	0.0	0.0
Net sales	(38.7)	(54.9)	(78.9)	(82.8)
Cost of goods sold	26.0	39.7	44.3	48.7
Gross profit	(12.7)	(15.2)	(34.6)	(34.1)
Marketing, general and administrative expenses	12.7	15.2	34.6	34.1
Special items, net	0.0	0.0	0.0	0.0
Equity income (loss) in subsidiaries	124.6	259.2	(187.6)	(384.7)
Equity income in MillerCoors	0.0	0.0	0.0	0.0
Operating income (loss)	124.6	259.2	(187.6)	(384.7)
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	124.6	259.2	(187.6)	(384.7)
Income tax benefit (expense)	0.0	0.0	0.0	0.0
Net Income (loss) from continuing operations	124.6	259.2	(187.6)	(384.7)
Income (loss) from discontinued operations, net of tax	0.0	0.0	0.0	0.0
Net income (loss) including noncontrolling interests	124.6	259.2	(187.6)	(384.7)
Net (income) loss attributable to noncontrolling interests	0.0	0.0	0.0	0.0
Net income (loss) attributable to MCBC	124.6	259.2	(187.6)	(384.7)
Comprehensive income (loss) attributable to Molson Coors Brewing Company	420.3	958.7	559.3	222.1
Consolidated [Member]
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Sales	1,454.3	1,650.0	3,890.5	4,514.2
Excise taxes	(436.9)	(482.0)	(1,167.4)	(1,341.7)
Net sales	1,017.4	1,168.0	2,723.1	3,172.5
Cost of goods sold	(585.9)	(666.6)	(1,620.6)	(1,873.1)
Gross profit	431.5	501.4	1,102.5	1,299.4
Marketing, general and administrative expenses	(265.2)	(289.6)	(789.1)	(881.3)
Special items, net	(293.5)	(367.6)	(335.8)	(317.8)
Equity income (loss) in subsidiaries	0.0	0.0	0.0	0.0
Equity income in MillerCoors	135.3	158.9	470.1	471.8
Operating income (loss)	8.1	3.1	447.7	572.1
Interest income (expense), net	(26.8)	(31.3)	(86.6)	(102.9)
Other income (expense), net	3.7	(5.0)	7.4	(3.5)
Income (loss) from continuing operations before income taxes	(15.0)	(33.2)	368.5	465.7
Income tax benefit (expense)	27.3	(0.7)	(43.9)	(41.9)
Net Income (loss) from continuing operations	12.3	(33.9)	324.6	423.8
Income (loss) from discontinued operations, net of tax	2.9	1.3	4.5	(0.4)
Net income (loss) including noncontrolling interests	15.2	(32.6)	329.1	423.4
Net (income) loss attributable to noncontrolling interests	1.4	(1.8)	(2.4)	(3.5)
Net income (loss) attributable to MCBC	$ 16.6	(34.4)	$ 326.7	419.9
Comprehensive income (loss) attributable to Molson Coors Brewing Company		$ (515.9)		$ (60.6)