Segment Reporting - Income (Loss) Before Income Taxes by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting
Net sales	$ 10,279.7	$ 9,654.0	$ 10,579.4
Interest expense	(260.3)	(274.6)	(280.9)
Investment Income, Interest	2.0	3.3	8.2
Income (loss) before income taxes	1,239.0	(643.9)	479.9
Income tax benefit (expense)	(230.5)	(301.8)	(233.7)
Net income (loss)	1,008.5	(945.7)	246.2
Net (income) loss attributable to noncontrolling interests	(2.8)	(3.3)	(4.5)
Net income (loss) attributable to Molson Coors Beverage Company	1,005.7	(949.0)	241.7
Unallocated
Segment Reporting
Net sales	0.0	0.0	0.0
Interest expense	(253.1)	(266.3)	(277.5)
Investment Income, Interest	1.8	2.8	7.7
Income (loss) before income taxes	29.6	(120.7)	(267.5)
Inter-segment net sales eliminations
Segment Reporting
Net sales	(7.6)	(14.9)	(25.2)
Interest expense	0.0	0.0	0.0
Investment Income, Interest	0.0	0.0	0.0
Income (loss) before income taxes	0.0	0.0	0.0
Americas | Operating segments
Segment Reporting
Net sales	8,485.0	8,237.0	8,618.2
Interest expense	(1.4)	(2.6)	2.8
Investment Income, Interest	0.0	0.2	0.0
Income (loss) before income taxes	1,176.5	1,080.5	645.0
EMEA&APAC | Operating segments
Segment Reporting
Net sales	1,802.3	1,431.9	1,986.4
Interest expense	(5.8)	(5.7)	(6.2)
Investment Income, Interest	0.2	0.3	0.5
Income (loss) before income taxes	$ 32.9	$ (1,603.7)	$ 102.4