CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net income (loss) including noncontrolling interests	$ 1,436.4	$ 1,998.9	$ 398.5
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	686.7	(234.4)	(918.4)
Unrealized gain (loss) on derivative and non-derivative financial instruments	(133.4)	9.7	20.9
Reclassification of derivative (gain) loss to income	1.3	(3.0)	(5.4)
Pension and other postretirement benefit adjustments	145.7	53.8	19.3
Amortization of net prior service (benefit) cost and net actuarial (gain) loss to income	3.6	22.8	16.1
Reclassification of historical share of MillerCoors' AOCI loss	0.0	258.2	0.0
Ownership share of unconsolidated subsidiaries' other comprehensive income (loss)	10.4	22.3	34.3
Total other comprehensive income (loss), net of tax	714.3	129.4	(833.2)
Comprehensive income (loss)	2,150.7	2,128.3	(434.7)
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	(24.7)	(3.0)	(2.3)
Comprehensive (income) loss attributable to noncontrolling interests	22.2	5.9	3.3
Comprehensive income (loss) attributable to Molson Coors Brewing Company	2,126.0	2,125.3	(437.0)
As Adjusted
Net income (loss) including noncontrolling interests	1,436.4	1,998.9	398.5
Other comprehensive income (loss), net of tax:
Pension and other postretirement benefit adjustments	145.7	53.8	19.3
Amortization of net prior service (benefit) cost and net actuarial (gain) loss to income	(3.6)	(22.8)	(16.1)
Total other comprehensive income (loss), net of tax	$ 714.3	$ 129.4	$ (833.2)