CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net income (loss) including noncontrolling interests	$ 346.4	$ (399.3)	$ 428.2	$ 80.0
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	149.8	(144.8)	(104.0)	(31.2)
Unrealized gain (loss) on derivative instruments	14.5	(55.8)	(114.1)	(123.8)
Reclassification of derivative (gain) loss to income	0.2	0.2	(0.9)	0.0
Amortization of net prior service (benefit) cost and net actuarial (gain) loss to income	(1.5)	(0.8)	(4.7)	(1.9)
Ownership share of unconsolidated subsidiaries' other comprehensive income (loss)	0.7	0.5	2.2	2.3
Total other comprehensive income (loss), net of tax	163.7	(200.7)	(221.5)	(154.6)
Comprehensive income (loss)	510.1	(600.0)	206.7	(74.6)
Comprehensive (income) loss attributable to noncontrolling interests	(5.1)	(2.5)	(7.1)	(0.9)
Comprehensive income (loss) attributable to Molson Coors Beverage Company	505.0	(602.5)	199.6	(75.5)
Net income (loss) including noncontrolling interests	$ 346.4	$ (399.3)	$ 428.2	$ 80.0