CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net income (loss) including noncontrolling interests	$ 430.8	$ 335.0	$ 713.3	$ 550.0
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(255.0)	310.9	(180.9)	392.5
Unrealized gain (loss) on derivative instruments	36.2	(68.6)	10.4	(77.2)
Reclassification of derivative (gain) loss to income	0.7	(0.4)	1.8	(0.4)
Amortization of net prior service (benefit) cost and net actuarial (gain) loss to income	1.3	4.7	3.0	3.7
Ownership share of unconsolidated subsidiaries' other comprehensive income (loss)	0.7	0.9	(0.5)	2.0
Total other comprehensive income (loss), net of tax	(216.1)	247.5	(166.2)	320.6
Comprehensive income (loss)	214.7	582.5	547.1	870.6
Comprehensive (income) loss attributable to noncontrolling interests	(5.1)	(6.3)	(10.3)	(13.2)
Comprehensive income (loss) attributable to Molson Coors Brewing Company	209.6	576.2	536.8	857.4
Consolidated [Member]
Other comprehensive income (loss), net of tax:
Comprehensive income (loss) attributable to Molson Coors Brewing Company	$ 209.6	$ 576.2	$ 536.8	$ 857.4