CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended								6 Months Ended	12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Sales	$ 2,901.9	$ 1,337.7	$ 1,407.0	$ 950.8	$ 1,236.9	$ 1,454.3	$ 1,433.0	$ 1,003.2		$ 6,597.4	$ 5,127.4	$ 5,927.5
Excise taxes	(607.9)	(390.1)	(420.8)	(293.6)	(392.5)	(436.9)	(427.3)	(303.2)		(1,712.4)	(1,559.9)	(1,781.2)
Net sales	2,294.0	947.6	986.2	657.2	844.4	1,017.4	1,005.7	700.0		4,885.0	3,567.5	4,146.3
Cost of goods sold	(1,485.6)	(541.3)	(562.2)	(414.0)	(542.9)	(585.9)	(579.9)	(454.8)		(3,003.1)	(2,163.5)	(2,493.3)
Gross profit	808.4	406.3	424.0	243.2	301.5	431.5	425.8	245.2		1,881.9	1,404.0	1,653.0
Marketing, general and administrative expenses										(1,597.3)	(1,051.8)	(1,163.9)
Special items, net										2,523.9	(346.7)	(324.4)
Equity Income Loss in Equity Method Investment										500.9	516.3	561.8
Operating income (loss)										3,309.4	521.8	726.5
Other income (expense), net
Interest expense										(271.6)	(120.3)	(145.0)
Interest income										27.2	8.3	11.3
Other income (expense), net										(29.7)	0.9	(6.5)
Total other income (expense), net										(274.1)	(111.1)	(140.2)
Income (loss) from continuing operations before income taxes										3,035.3	410.7	586.3
Income tax benefit (expense)				16.7					$ 37.9	(1,050.7)	(51.8)	(69.0)
Net income (loss) from continuing operations										1,984.6	358.9	517.3
Income (loss) from discontinued operations, net of tax	(0.5)	0.0	(1.8)	(0.5)	(0.6)	2.9	(0.3)	1.9		(2.8)	3.9	0.5
Net income (loss) including noncontrolling interests										1,981.8	362.8	517.8
Net (income) loss attributable to noncontrolling interests										(5.9)	(3.3)	(3.8)
Net income (loss) attributable to Molson Coors Brewing Company	$ 1,438.4	$ 202.5	$ 172.3	$ 162.7	$ 32.8	$ 16.6	$ 229.0	$ 81.1	$ 335.0	$ 1,975.9	$ 359.5	$ 514.0
Basic net income (loss) attributable to Molson Coors Brewing Company per share:
From continuing operations (in dollars per share)	$ 6.70	$ 0.94	$ 0.81	$ 0.80	$ 0.18	$ 0.07	$ 1.23	$ 0.43		$ 9.33	$ 1.92	$ 2.78
From discontinued operations (in dollars per share)	0.00	0.00	(0.01)	0.00	0.00	0.02	0.00	0.01		(0.01)	0.02	0.00
Basic net income (loss) attributable to Molson Coors Brewing Company (in dollars per share)	6.70	0.94	0.80	0.80	0.18	0.09	1.23	0.44	$ 1.60	9.32	1.94	2.78
Diluted net income (loss) attributable to Molson Coors Brewing Company per share:
From continuing operations (in dollars per share)	6.65	0.94	0.81	0.80	0.18	0.07	1.23	0.42		9.27	1.91	2.76
From discontinued operations (in dollars per share)	0.00	0.00	(0.01)	0.00	0.00	0.02	0.00	0.01		(0.01)	0.02	0.00
Diluted net income (loss) attributable to Molson Coors Brewing Company per share	$ 6.65	$ 0.94	$ 0.80	$ 0.80	$ 0.18	$ 0.09	$ 1.23	$ 0.43	$ 1.59	$ 9.26	$ 1.93	$ 2.76
Weighted-average shares—basic										212.0	185.3	184.9
Weighted-average shares for diluted EPS				205.1					210.5	213.4	186.4	186.1
Amounts attributable to Molson Coors Brewing Company
Net income (loss) from continuing operations	$ 1,438.9	$ 202.5	$ 174.1	$ 163.2	$ 33.4	$ 13.7	$ 229.3	$ 79.2		$ 1,978.7	$ 355.6	$ 513.5
Income (loss) from discontinued operations, net of tax	(0.5)	0.0	(1.8)	(0.5)	(0.6)	2.9	(0.3)	1.9		(2.8)	3.9	0.5
Net income (loss) attributable to Molson Coors Brewing Company	$ 1,438.4	$ 202.5	$ 172.3	$ 162.7	$ 32.8	$ 16.6	$ 229.0	$ 81.1	$ 335.0	$ 1,975.9	$ 359.5	$ 514.0