Supplemental Guarantor Information Income statement (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Sales Revenue, Goods, Gross	$ 3,793.1	$ 1,407.0	$ 6,706.9	$ 2,357.8
Excise taxes	(701.8)	(420.8)	(1,166.9)	(714.4)
Net sales	3,091.3	986.2	5,540.0	1,643.4
Cost of goods sold	(1,756.1)	(562.2)	(3,129.0)	(976.2)
Gross profit	1,335.2	424.0	2,411.0	667.2
Marketing, general and administrative expenses	(781.2)	(313.6)	(1,484.0)	(564.5)
Special items, net	(16.5)	(34.5)	(20.3)	74.1
Equity income in MillerCoors	0.0	191.9	0.0	334.3
Operating income (loss)	537.5	267.8	906.7	511.1
Interest income (expense), net	(89.2)	(40.5)	(185.8)	(87.8)
Other income (expense), net	1.5	(30.4)	1.9	(45.7)
Income (loss) from continuing operations before income taxes	449.8	196.9	722.8	377.6
Income tax benefit (expense)	(123.0)	(21.2)	(187.6)	(37.9)
Total income (loss) reclassified, before tax	326.8	175.7	535.2	339.7
Income (loss) from discontinued operations, net of tax	1.6	(1.8)	1.0	(2.3)
Net income (loss) including noncontrolling interests	328.4	173.9	536.2	337.4
Net (income) loss attributable to noncontrolling interests	(5.1)	(1.6)	(11.6)	(2.4)
Net income (loss) attributable to Molson Coors Brewing Company	323.3	172.3	524.6	335.0
Comprehensive income (loss) attributable to Molson Coors Brewing Company	571.2	36.3	847.8	456.0
Parent Company [Member]
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Sales Revenue, Goods, Gross	8.3	6.9	15.3	13.5
Excise taxes	0.0	0.0	0.0	0.0
Net sales	8.3	6.9	15.3	13.5
Cost of goods sold	(1.0)	0.0	(1.0)	0.0
Gross profit	7.3	6.9	14.3	13.5
Marketing, general and administrative expenses	(68.2)	(51.1)	(135.9)	(98.1)
Special items, net	(0.3)	0.0	(0.8)	0.0
Equity income (loss) in subsidiaries	434.0	228.5	772.8	444.3
Equity income in MillerCoors		0.0		0.0
Operating income (loss)	372.8	184.3	650.4	359.7
Interest income (expense), net	(74.4)	(32.8)	(155.5)	(72.7)
Other income (expense), net	0.0	(22.0)	(8.2)	(40.3)
Income (loss) from continuing operations before income taxes	298.4	129.5	486.7	246.7
Income tax benefit (expense)	24.9	42.8	37.9	88.3
Total income (loss) reclassified, before tax	323.3	172.3	524.6	335.0
Income (loss) from discontinued operations, net of tax	0.0	0.0	0.0	0.0
Net income (loss) including noncontrolling interests	323.3	172.3	524.6	335.0
Net (income) loss attributable to noncontrolling interests	0.0	0.0	0.0	0.0
Net income (loss) attributable to Molson Coors Brewing Company	323.3	172.3	524.6	335.0
Comprehensive income (loss) attributable to Molson Coors Brewing Company	571.2	36.3	847.8	456.0
Subsidiary Guarantors [Member]
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Sales Revenue, Goods, Gross	2,954.1	590.1	5,330.7	966.0
Excise taxes	(411.5)	(131.8)	(737.2)	(215.8)
Net sales	2,542.6	458.3	4,593.5	750.2
Cost of goods sold	(1,423.9)	(242.9)	(2,566.9)	(406.6)
Gross profit	1,118.7	215.4	2,026.6	343.6
Marketing, general and administrative expenses	(558.7)	(104.0)	(1,056.3)	(183.8)
Special items, net	(13.7)	(1.4)	(14.4)	107.9
Equity income (loss) in subsidiaries	(138.0)	(90.9)	(216.1)	(204.3)
Equity income in MillerCoors		191.9		334.3
Operating income (loss)	408.3	211.0	739.8	397.7
Interest income (expense), net	60.3	71.6	119.2	140.8
Other income (expense), net	94.9	(8.7)	111.6	(4.1)
Income (loss) from continuing operations before income taxes	563.5	273.9	970.6	534.4
Income tax benefit (expense)	(129.7)	(87.9)	(197.8)	(173.3)
Total income (loss) reclassified, before tax	433.8	186.0	772.8	361.1
Income (loss) from discontinued operations, net of tax	0.0	0.0	0.0	0.0
Net income (loss) including noncontrolling interests	433.8	186.0	772.8	361.1
Net (income) loss attributable to noncontrolling interests	0.0	0.0	0.0	0.0
Net income (loss) attributable to Molson Coors Brewing Company	433.8	186.0	772.8	361.1
Comprehensive income (loss) attributable to Molson Coors Brewing Company	725.7	46.4	1,138.6	455.2
Subsidiary Non Guarantors [Member]
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Sales Revenue, Goods, Gross	973.2	850.1	1,623.2	1,445.4
Excise taxes	(290.3)	(289.0)	(429.7)	(498.6)
Net sales	682.9	561.1	1,193.5	946.8
Cost of goods sold	(461.8)	(352.4)	(801.2)	(622.8)
Gross profit	221.1	208.7	392.3	324.0
Marketing, general and administrative expenses	(166.2)	(165.5)	(314.0)	(296.5)
Special items, net	(2.5)	(33.1)	(5.1)	(33.8)
Equity income (loss) in subsidiaries	61.3	87.9	80.3	237.2
Equity income in MillerCoors		0.0		0.0
Operating income (loss)	113.7	98.0	153.5	230.9
Interest income (expense), net	(75.1)	(79.3)	(149.5)	(155.9)
Other income (expense), net	(93.4)	0.3	(101.5)	(1.3)
Income (loss) from continuing operations before income taxes	(54.8)	19.0	(97.5)	73.7
Income tax benefit (expense)	(18.2)	23.9	(27.7)	47.1
Total income (loss) reclassified, before tax	(73.0)	42.9	(125.2)	120.8
Income (loss) from discontinued operations, net of tax	1.6	(1.8)	1.0	(2.3)
Net income (loss) including noncontrolling interests	(71.4)	41.1	(124.2)	118.5
Net (income) loss attributable to noncontrolling interests	(5.1)	(1.6)	(11.6)	(2.4)
Net income (loss) attributable to Molson Coors Brewing Company	(76.5)	39.5	(135.8)	116.1
Comprehensive income (loss) attributable to Molson Coors Brewing Company	87.0	(100.4)	73.2	(1.0)
Consolidated [Member]
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Sales Revenue, Goods, Gross	3,793.1	1,407.0	6,706.9	2,357.8
Excise taxes	(701.8)	(420.8)	(1,166.9)	(714.4)
Net sales	3,091.3	986.2	5,540.0	1,643.4
Cost of goods sold	(1,756.1)	(562.2)	(3,129.0)	(976.2)
Gross profit	1,335.2	424.0	2,411.0	667.2
Marketing, general and administrative expenses	(781.2)	(313.6)	(1,484.0)	(564.5)
Special items, net	(16.5)	(34.5)	(20.3)	74.1
Equity income (loss) in subsidiaries	0.0	0.0	0.0	0.0
Equity income in MillerCoors		191.9		334.3
Operating income (loss)	537.5	267.8	906.7	511.1
Interest income (expense), net	(89.2)	(40.5)	(185.8)	(87.8)
Other income (expense), net	1.5	(30.4)	1.9	(45.7)
Income (loss) from continuing operations before income taxes	449.8	196.9	722.8	377.6
Income tax benefit (expense)	(123.0)	(21.2)	(187.6)	(37.9)
Total income (loss) reclassified, before tax	326.8	175.7	535.2	339.7
Income (loss) from discontinued operations, net of tax	1.6	(1.8)	1.0	(2.3)
Net income (loss) including noncontrolling interests	328.4	173.9	536.2	337.4
Net (income) loss attributable to noncontrolling interests	(5.1)	(1.6)	(11.6)	(2.4)
Net income (loss) attributable to Molson Coors Brewing Company	323.3	172.3	524.6	335.0
Comprehensive income (loss) attributable to Molson Coors Brewing Company	571.2	36.3	847.8	456.0
Consolidation, Eliminations [Member]
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Sales Revenue, Goods, Gross	(142.5)	(40.1)	(262.3)	(67.1)
Excise taxes	0.0	0.0	0.0	0.0
Net sales	(142.5)	(40.1)	(262.3)	(67.1)
Cost of goods sold	130.6	33.1	240.1	53.2
Gross profit	(11.9)	(7.0)	(22.2)	(13.9)
Marketing, general and administrative expenses	11.9	7.0	22.2	13.9
Special items, net	0.0	0.0	0.0	0.0
Equity income (loss) in subsidiaries	(357.3)	(225.5)	(637.0)	(477.2)
Equity income in MillerCoors		0.0		0.0
Operating income (loss)	(357.3)	(225.5)	(637.0)	(477.2)
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	(357.3)	(225.5)	(637.0)	(477.2)
Income tax benefit (expense)	0.0	0.0	0.0	0.0
Total income (loss) reclassified, before tax	(357.3)	(225.5)	(637.0)	(477.2)
Income (loss) from discontinued operations, net of tax	0.0	0.0	0.0	0.0
Net income (loss) including noncontrolling interests	(357.3)	(225.5)	(637.0)	(477.2)
Net (income) loss attributable to noncontrolling interests	0.0	0.0	0.0	0.0
Net income (loss) attributable to Molson Coors Brewing Company	(357.3)	(225.5)	(637.0)	(477.2)
Comprehensive income (loss) attributable to Molson Coors Brewing Company	$ (812.7)	$ 54.0	$ (1,211.8)	$ (454.2)