Business Segment Information - Segment Information (Details) - USD ($) $ in Millions	3 Months Ended
	May 31, 2025	May 31, 2024
Segment Reporting Information [Line Items]
Net sales	$ 2,515.0	$ 2,661.8
Cost of product sold	1,248.4	1,258.0
Comparable operating income (loss)	713.8	941.6
Income (loss) from unconsolidated investments	(3.5)	82.0
Interest expense, net	(98.9)	(102.8)
Income (loss) before income taxes	611.4	920.8
Capital expenditures	192.8	375.3
Depreciation and amortization	105.5	111.9
Income (loss) from unconsolidated investments
Equity in earnings (losses) of equity method investees and related activities	(3.5)	(1.3)
Net gain (loss) on conversion and exchange to exchangeable shares	0.0	83.3
Income (loss) from unconsolidated investments	(3.5)	82.0
Interest expense	(100.6)	(104.8)
Interest income	1.7	2.0
Comparable Adjustments
Segment Reporting Information [Line Items]
Cost of product sold	16.5	(22.0)
Comparable operating income (loss)	809.9	924.0
Comparable adjustments	(96.1)	17.6
Operating Segments | Beer
Segment Reporting Information [Line Items]
Net sales	2,234.5	2,272.8
Cost of product sold	(1,047.5)	(1,059.7)
Marketing	$ (200.5)	$ (190.3)
Marketing as a percentage of net sales	9.00%	8.40%
General and administrative expenses	$ (113.1)	$ (99.8)
Comparable operating income (loss)	$ 873.4	$ 923.0
Operating margin	39.10%	40.60%
Capital expenditures	$ 173.2	$ 314.4
Depreciation and amortization	$ 76.8	$ 86.4
Depreciation and amortization as a percentage of net sales	3.40%	3.80%
Operating Segments | Wine and Spirits
Segment Reporting Information [Line Items]
Net sales	$ 280.5	$ 389.0
Cost of product sold	(184.4)	(220.3)
Marketing	$ (34.9)	$ (40.9)
Marketing as a percentage of net sales	12.40%	10.50%
General and administrative expenses	$ (67.2)	$ (68.1)
Comparable operating income (loss)	$ (6.0)	$ 59.7
Operating margin	(2.10%)	15.30%
Capital expenditures	$ 18.0	$ 49.6
Depreciation and amortization	$ 22.2	$ 21.3
Depreciation and amortization as a percentage of net sales	7.90%	5.50%
Operating Segments | Corporate Operations and Other
Segment Reporting Information [Line Items]
Net sales	$ 0.0	$ 0.0
Cost of product sold	0.0	0.0
Marketing	0.0	0.0
General and administrative expenses	(57.5)	(58.7)
Comparable operating income (loss)	(57.5)	(58.7)
Capital expenditures	1.6	11.3
Depreciation and amortization	$ 6.5	$ 4.2