CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net income (loss) including noncontrolling interests	$ 345.6	$ 293.1	$ 1,058.9	$ 843.1
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	17.2	215.2	(163.7)	607.7
Unrealized gain (loss) on derivative instruments	9.6	(38.9)	20.0	(116.1)
Reclassification of derivative (gain) loss to income	0.2	0.9	2.0	0.5
Amortization of net prior service (benefit) cost and net actuarial (gain) loss to income	1.1	4.6	4.1	8.3
Ownership share of unconsolidated subsidiaries' other comprehensive income (loss)	0.6	0.9	0.1	2.9
Total other comprehensive income (loss), net of tax	28.7	182.7	(137.5)	503.3
Comprehensive income (loss)	374.3	475.8	921.4	1,346.4
Comprehensive (income) loss attributable to noncontrolling interests	(7.0)	(6.9)	(17.3)	(20.1)
Comprehensive income (loss) attributable to Molson Coors Brewing Company	367.3	468.9	904.1	1,326.3
Consolidated [Member]
Other comprehensive income (loss), net of tax:
Comprehensive income (loss) attributable to Molson Coors Brewing Company	$ 367.3	$ 468.9	$ 904.1	$ 1,326.3