CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Sales	$ 13,338.0	$ 13,471.5	$ 6,597.4
Excise taxes	(2,568.4)	(2,468.7)	(1,712.4)
Net Sales	10,769.6	11,002.8	4,885.0
Cost of Goods Sold	(6,584.8)	(6,236.7)	(2,999.0)
Gross profit	4,184.8	4,766.1	1,886.0
Marketing, general and administrative expenses	(2,802.7)	(3,052.0)	(1,597.2)
Special items, net	249.7	(36.4)	2,532.9
Equity Income Loss in Equity Method Investment	0.0	0.0	500.9
Operating income (loss)	1,631.8	1,677.7	3,322.6
Other income (expense), net
Interest expense	(306.2)	(349.3)	(271.6)
Interest income	8.0	6.0	27.2
Total other non-service pension and postretirement benefits (costs), net	38.2	47.4	8.4
Other income (expense), net	(12.0)	1.4	(32.5)
Total other income (expense), net	(272.0)	(294.5)	(268.5)
Income (loss) before income taxes	1,359.8	1,383.2	3,054.1
Income tax benefit (expense)	(225.2)	204.6	(1,454.3)
Net Income (Loss)	1,134.6	1,587.8	1,599.8
Net (income) loss attributable to noncontrolling interests	(18.1)	(22.2)	(5.9)
Net income (loss) attributable to Molson Coors Brewing Company	$ 1,116.5	$ 1,565.6	$ 1,593.9
Basic net income (loss) attributable to Molson Coors Brewing Company per share:
Basic net income (loss) attributable to Molson Coors Brewing Company per share (in dollars per share)	$ 5.17	$ 7.27	$ 7.52
Diluted net income (loss) attributable to Molson Coors Brewing Company per share:
Diluted net income (loss) attributable to Molson Coors Brewing Company per share (in dollars per share)	$ 5.15	$ 7.23	$ 7.47
Weighted-average shares—basic	216.0	215.4	212.0
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	0.6	1.1	1.4
Weighted-average shares for diluted EPS	216.6	216.5	213.4
Amounts attributable to Molson Coors Brewing Company
Income (loss) from discontinued operations, net of tax		$ 1.5	$ 2.8
Net income (loss) attributable to Molson Coors Brewing Company	$ 1,116.5	$ 1,565.6	$ 1,593.9
Stock Compensation Plan [Member]
Diluted net income (loss) attributable to Molson Coors Brewing Company per share:
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0.8	0.3	0.1