Segment Reporting - Income (Loss) Before Income Taxes by Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting Information [Line Items]
Net sales	$ 2,351.1	$ 2,304.1
Cost of goods sold	(1,453.9)	(1,453.2)
Marketing and sales expenses	(278.9)	(286.1)
General and administrative expenses	(331.1)	(367.1)
Other operating income (expense), net	(32.1)	(15.9)
Equity income (loss)	3.2	4.5
Interest expense	(60.2)	(61.3)
Interest income	2.6	4.7
Other segment items	(6.0)	26.6
Income (loss) before income taxes	194.7	156.3
Income tax benefit (expense)	(44.6)	(33.2)
Net income (loss)	150.1	123.1
Net (income) loss attributable to noncontrolling interests	1.2	(2.1)
Net income (loss) attributable to Molson Coors Beverage Company	151.3	121.0
Unallocated
Segment Reporting Information [Line Items]
Net sales	0.0	0.0
Cost of goods sold	89.2	18.7
Marketing and sales expenses	0.0	0.0
General and administrative expenses	0.0	0.0
Other operating income (expense), net	0.0	0.0
Equity income (loss)	0.0	0.0
Interest expense	(59.0)	(59.6)
Interest income	2.5	4.6
Other segment items	6.3	2.5
Income (loss) before income taxes	39.0	(33.8)
Inter-segment net sales eliminations
Segment Reporting Information [Line Items]
Net sales	(5.5)	(5.0)
Cost of goods sold	5.5	5.0
Marketing and sales expenses	0.0	0.0
General and administrative expenses	0.0	0.0
Other operating income (expense), net	0.0	0.0
Equity income (loss)	0.0	0.0
Interest expense	0.0	0.0
Interest income	0.0	0.0
Other segment items	0.0	0.0
Income (loss) before income taxes	0.0	0.0
Americas | One Customer
Segment Reporting Information [Line Items]
Net sales	300.0	200.0
Americas | Operating Segments
Segment Reporting Information [Line Items]
Net sales	1,900.5	1,881.8
Cost of goods sold	(1,207.2)	(1,169.9)
Marketing and sales expenses	(229.0)	(237.7)
General and administrative expenses	(234.7)	(276.6)
Other operating income (expense), net	(13.1)	(15.9)
Equity income (loss)	3.2	4.5
Interest expense	(0.5)	(0.7)
Interest income	0.0	0.0
Other segment items	(11.8)	23.8
Income (loss) before income taxes	207.4	209.3
EMEA&APAC | Operating Segments
Segment Reporting Information [Line Items]
Net sales	456.1	427.3
Cost of goods sold	(341.4)	(307.0)
Marketing and sales expenses	(49.9)	(48.4)
General and administrative expenses	(96.4)	(90.5)
Other operating income (expense), net	(19.0)	0.0
Equity income (loss)	0.0	0.0
Interest expense	(0.7)	(1.0)
Interest income	0.1	0.1
Other segment items	(0.5)	0.3
Income (loss) before income taxes	$ (51.7)	$ (19.2)