Segment Reporting - Income (Loss) Before Income Taxes by Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Net sales	$ 3,200.8	$ 3,252.3	$ 5,504.9	$ 5,848.7
Cost of goods sold	(1,918.9)	(1,922.4)	(3,372.1)	(3,555.3)
Marketing and sales expenses	(383.9)	(402.0)	(670.0)	(703.2)
General and administrative expenses	(309.2)	(326.5)	(676.3)	(679.9)
Equity income (loss)	4.0	(1.9)	8.5	(2.8)
Interest expense	(61.6)	(57.8)	(122.9)	(113.2)
Interest income	3.1	6.6	7.8	13.6
Other segment items	20.6	11.6	31.3	17.4
Income (loss) before income taxes	554.9	559.9	711.2	825.3
Income tax benefit (expense)	(130.6)	(134.6)	(163.8)	(190.1)
Net income (loss)	424.3	425.3	547.4	635.2
Net (income) loss attributable to noncontrolling interests	4.4	1.7	2.3	(0.4)
Net income (loss) attributable to Molson Coors Beverage Company	428.7	427.0	549.7	634.8
Unallocated
Segment Reporting Information [Line Items]
Net sales	0.0	0.0	0.0	0.0
Cost of goods sold	7.0	28.3	25.7	28.8
Marketing and sales expenses	0.0	0.0	0.0	0.0
General and administrative expenses	0.0	0.0	0.0	0.0
Equity income (loss)	0.0	0.0	0.0	0.0
Interest expense	(59.9)	(56.0)	(119.5)	(110.0)
Interest income	3.0	6.1	7.6	12.6
Other segment items	1.8	13.2	4.3	16.0
Income (loss) before income taxes	(48.1)	(8.4)	(81.9)	(52.6)
Inter-segment net sales eliminations
Segment Reporting Information [Line Items]
Net sales	(7.9)	(6.9)	(12.9)	(10.6)
Cost of goods sold	7.9	6.9	12.9	10.6
Marketing and sales expenses	0.0	0.0	0.0	0.0
General and administrative expenses	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	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	2,504.8	2,575.9	4,386.6	4,721.3
Cost of goods sold	(1,468.4)	(1,525.7)	(2,638.3)	(2,841.2)
Marketing and sales expenses	(308.7)	(326.8)	(546.4)	(576.5)
General and administrative expenses	(217.7)	(233.9)	(494.3)	(490.9)
Equity income (loss)	4.0	(1.9)	8.5	(2.8)
Interest expense	(0.6)	(0.5)	(1.3)	(0.8)
Interest income	0.0	0.0	0.0	0.1
Other segment items	24.8	0.0	32.7	(1.5)
Income (loss) before income taxes	538.2	487.1	747.5	807.7
EMEA&APAC | Operating Segments
Segment Reporting Information [Line Items]
Net sales	703.9	683.3	1,131.2	1,138.0
Cost of goods sold	(465.4)	(431.9)	(772.4)	(753.5)
Marketing and sales expenses	(75.2)	(75.2)	(123.6)	(126.7)
General and administrative expenses	(91.5)	(92.6)	(182.0)	(189.0)
Equity income (loss)	0.0	0.0	0.0	0.0
Interest expense	(1.1)	(1.3)	(2.1)	(2.4)
Interest income	0.1	0.5	0.2	0.9
Other segment items	(6.0)	(1.6)	(5.7)	2.9
Income (loss) before income taxes	$ 64.8	$ 81.2	$ 45.6	$ 70.2