Segment Reporting - Income (Loss) Before Income Taxes by Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Net sales	$ 2,973.5	$ 3,042.7	$ 8,478.4	$ 8,891.4
Cost of goods sold	(1,800.0)	(1,840.2)	(5,172.1)	(5,395.5)
Marketing and sales expenses	(366.5)	(353.2)	(1,036.5)	(1,056.4)
General and administrative expenses	(320.2)	(331.5)	(996.5)	(1,011.4)
Goodwill impairment	(3,645.7)	0.0	(3,645.7)	0.0
Other operating income (expense), net	(275.2)	(65.8)	(300.3)	(59.4)
Equity income (loss)	3.0	(0.8)	11.5	(3.6)
Interest expense	(62.7)	(106.4)	(185.6)	(219.6)
Interest income		13.3
Interest income	6.7		14.5	26.9
Other segment items	(8.4)	(26.7)	48.0	(15.7)
Income (loss) before income taxes	(3,495.5)	331.4	(2,784.3)	1,156.7
Income tax benefit (expense)	558.6	(102.6)	394.8	(292.7)
Net income (loss)	(2,936.9)	228.8	(2,389.5)	864.0
Net (income) loss attributable to noncontrolling interests	9.3	(29.0)	11.6	(29.4)
Net income (loss) attributable to Molson Coors Beverage Company	(2,927.6)	199.8	(2,377.9)	834.6
Unallocated
Segment Reporting Information [Line Items]
Net sales	0.0	0.0	0.0	0.0
Cost of goods sold	11.3	(1.9)	37.0	26.9
Marketing and sales expenses	0.0	0.0	0.0	0.0
General and administrative expenses	0.0	0.0	0.0	0.0
Goodwill impairment	0.0		0.0
Other operating income (expense), net	0.0	0.0	0.0	0.0
Equity income (loss)	0.0	0.0	0.0	0.0
Interest expense	(61.3)	(59.3)	(180.8)	(169.3)
Interest income		13.8
Interest income	6.7		14.3	26.4
Other segment items	3.6	(26.6)	7.9	(10.6)
Income (loss) before income taxes	(39.7)	(74.0)	(121.6)	(126.6)
Inter-segment net sales eliminations
Segment Reporting Information [Line Items]
Net sales	(7.5)	(6.7)	(20.4)	(17.3)
Cost of goods sold	7.5	6.7	20.4	17.3
Marketing and sales expenses	0.0	0.0	0.0	0.0
General and administrative expenses	0.0	0.0	0.0	0.0
Goodwill impairment	0.0		0.0
Other operating income (expense), net	0.0	0.0	0.0	0.0
Equity income (loss)	0.0	0.0	0.0	0.0
Interest expense	0.0	0.0	0.0	0.0
Interest income		0.0
Interest income	0.0		0.0	0.0
Other segment items	0.0	0.0	0.0	0.0
Income (loss) before income taxes	0.0	0.0	0.0	0.0
Americas | Operating Segments
Segment Reporting Information [Line Items]
Net sales	2,260.0	2,345.0	6,646.6	7,066.3
Cost of goods sold	(1,350.6)	(1,403.1)	(3,988.9)	(4,244.3)
Marketing and sales expenses	(291.0)	(282.4)	(837.4)	(858.9)
General and administrative expenses	(231.3)	(239.3)	(725.6)	(730.2)
Goodwill impairment	(3,645.7)		(3,645.7)
Other operating income (expense), net	(75.6)	(65.3)	(93.1)	(65.3)
Equity income (loss)	3.0	(0.8)	11.5	(3.6)
Interest expense	(0.6)	(0.4)	(1.9)	(1.2)
Interest income		0.1
Interest income	0.0		0.0	0.2
Other segment items	(13.6)	0.0	36.6	(1.5)
Income (loss) before income taxes	(3,345.4)	353.8	(2,597.9)	1,161.5
EMEA&APAC | Operating Segments
Segment Reporting Information [Line Items]
Net sales	721.0	704.4	1,852.2	1,842.4
Cost of goods sold	(468.2)	(441.9)	(1,240.6)	(1,195.4)
Marketing and sales expenses	(75.5)	(70.8)	(199.1)	(197.5)
General and administrative expenses	(88.9)	(92.2)	(270.9)	(281.2)
Goodwill impairment	0.0		0.0
Other operating income (expense), net	(199.6)	(0.5)	(207.2)	5.9
Equity income (loss)	0.0	0.0	0.0	0.0
Interest expense	(0.8)	(46.7)	(2.9)	(49.1)
Interest income		(0.6)
Interest income	0.0		0.2	0.3
Other segment items	1.6	(0.1)	3.5	(3.6)
Income (loss) before income taxes	$ (110.4)	$ 51.6	$ (64.8)	$ 121.8