Supplemental Guarantor Information Income statement (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Condensed financial statements
Sales	$ 2,537.8	$ 2,800.1
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Excise taxes	(435.0)	(496.8)
Net Sales	2,102.8	2,303.3
Cost of Goods Sold	(1,479.0)	(1,413.0)
Gross profit	623.8	890.3
Marketing, general and administrative expenses	(629.7)	(655.2)
Special items, net	(86.6)	(13.0)
Operating income (loss)	(92.5)	222.1
Interest income (expense), net	(68.9)	(73.3)
Other pension and postretirement benefits (costs), net	(7.5)	(8.6)
Other income (expense), net	(4.8)	23.9
Income tax benefit (expense)	43.3	(32.2)
Net Income (loss)	(115.4)	149.1
Net (income) loss attributable to noncontrolling interests	(1.6)	2.3
Net income (loss) attributable to Molson Coors Beverage Company	(117.0)	151.4
Comprehensive income (loss) attributable to Molson Coors Beverage Company	(616.1)	193.5
Parent Company [Member]
Condensed financial statements
Sales	1.7	26.3
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Excise taxes	0.0	0.0
Net Sales	1.7	26.3
Cost of Goods Sold	(0.4)	(1.5)
Gross profit	1.3	24.8
Marketing, general and administrative expenses	(36.7)	(71.6)
Special items, net	(5.3)	(0.4)
Equity income (loss) in subsidiaries	(34.8)	245.3
Operating income (loss)	(75.5)	198.1
Interest income (expense), net	(59.5)	(77.4)
Other pension and postretirement benefits (costs), net	0.0	0.0
Other income (expense), net	(0.6)	0.0
Income (loss) before income taxes	(135.6)	120.7
Income tax benefit (expense)	18.6	30.7
Net Income (loss)	(117.0)	151.4
Net (income) loss attributable to noncontrolling interests	0.0	0.0
Net income (loss) attributable to Molson Coors Beverage Company	(117.0)	151.4
Comprehensive income (loss) attributable to Molson Coors Beverage Company	(616.1)	193.5
Subsidiary Guarantors [Member]
Condensed financial statements
Sales	2,039.0	2,209.3
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Excise taxes	(263.2)	(284.7)
Net Sales	1,775.8	1,924.6
Cost of Goods Sold	(1,217.7)	(1,135.3)
Gross profit	558.1	789.3
Marketing, general and administrative expenses	(440.6)	(457.9)
Special items, net	(73.1)	(8.4)
Equity income (loss) in subsidiaries	(74.9)	(63.0)
Operating income (loss)	(30.5)	260.0
Interest income (expense), net	(7.1)	80.2
Other pension and postretirement benefits (costs), net	5.1	1.2
Other income (expense), net	(4.0)	(29.9)
Income (loss) before income taxes	(36.5)	311.5
Income tax benefit (expense)	3.2	(66.0)
Net Income (loss)	(33.3)	245.5
Net (income) loss attributable to noncontrolling interests	0.0	0.0
Net income (loss) attributable to Molson Coors Beverage Company	(33.3)	245.5
Comprehensive income (loss) attributable to Molson Coors Beverage Company	(393.0)	270.8
Subsidiary Non Guarantors [Member]
Condensed financial statements
Sales	613.3	694.9
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Excise taxes	(171.8)	(212.1)
Net Sales	441.5	482.8
Cost of Goods Sold	(372.4)	(365.6)
Gross profit	69.1	117.2
Marketing, general and administrative expenses	(157.1)	(166.7)
Special items, net	(8.2)	(4.2)
Equity income (loss) in subsidiaries	(20.2)	(5.9)
Operating income (loss)	(116.4)	(59.6)
Interest income (expense), net	(2.3)	(76.1)
Other pension and postretirement benefits (costs), net	2.4	7.4
Other income (expense), net	(0.2)	53.8
Income (loss) before income taxes	(116.5)	(74.5)
Income tax benefit (expense)	21.5	3.1
Net Income (loss)	(95.0)	(71.4)
Net (income) loss attributable to noncontrolling interests	(1.6)	2.3
Net income (loss) attributable to Molson Coors Beverage Company	(96.6)	(69.1)
Comprehensive income (loss) attributable to Molson Coors Beverage Company	(541.3)	(64.4)
Consolidated [Member]
Condensed financial statements
Sales	2,537.8	2,800.1
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Excise taxes	(435.0)	(496.8)
Net Sales	2,102.8	2,303.3
Cost of Goods Sold	(1,479.0)	(1,413.0)
Gross profit	623.8	890.3
Marketing, general and administrative expenses	(629.7)	(655.2)
Special items, net	(86.6)	(13.0)
Equity income (loss) in subsidiaries	0.0	0.0
Operating income (loss)	(92.5)	222.1
Interest income (expense), net	(68.9)	(73.3)
Other pension and postretirement benefits (costs), net	7.5	8.6
Other income (expense), net	(4.8)	23.9
Income (loss) before income taxes	(158.7)	181.3
Income tax benefit (expense)	43.3	(32.2)
Net Income (loss)	(115.4)	149.1
Net (income) loss attributable to noncontrolling interests	(1.6)	2.3
Net income (loss) attributable to Molson Coors Beverage Company	(117.0)	151.4
Comprehensive income (loss) attributable to Molson Coors Beverage Company	(616.1)	193.5
Consolidation, Eliminations [Member]
Condensed financial statements
Sales	(116.2)	(130.4)
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Excise taxes	0.0	0.0
Net Sales	(116.2)	(130.4)
Cost of Goods Sold	111.5	89.4
Gross profit	(4.7)	(41.0)
Marketing, general and administrative expenses	4.7	41.0
Special items, net	0.0	0.0
Equity income (loss) in subsidiaries	129.9	(176.4)
Operating income (loss)	129.9	(176.4)
Interest income (expense), net	0.0	0.0
Other pension and postretirement benefits (costs), net	0.0	0.0
Other income (expense), net	0.0	0.0
Income (loss) before income taxes	129.9	(176.4)
Income tax benefit (expense)	0.0	0.0
Net Income (loss)	129.9	(176.4)
Net (income) loss attributable to noncontrolling interests	0.0	0.0
Net income (loss) attributable to Molson Coors Beverage Company	129.9	(176.4)
Comprehensive income (loss) attributable to Molson Coors Beverage Company	$ 934.3	$ (206.4)