Business Segment Information - Comparable Adjustments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Aug. 31, 2025	Aug. 31, 2024	Aug. 31, 2025	Aug. 31, 2024	Feb. 28, 2025
Cost of Goods and Services Sold [Abstract]
Net gain (loss) on undesignated commodity derivative contracts	$ 15.1	$ (55.0)	$ 2.4	$ (36.4)
Comparable adjustments, cost of product sold	(1,171.0)	(1,407.1)	(2,419.4)	(2,665.1)
Selling, General and Administrative Expense [Abstract]
Selling, General and Administrative Expense	(436.0)	(491.2)	(936.7)	(953.4)
Goodwill impairment	0.0	(2,250.0)	0.0	(2,250.0)	$ (2,740.7)
Asset impairment and related expenses	0.0	0.0	(52.1)	0.0
2025 Restructuring Initiative
Selling, General and Administrative Expense [Abstract]
Restructuring and Related Cost, Incurred Cost	(8.3)		(21.6)
Comparable Adjustments
Cost of Goods and Services Sold [Abstract]
Flow Through of Inventory Step up	(0.8)	(1.3)	(1.7)	(2.4)
Strategic Business Development Costs	(1.2)	0.0	(1.6)	0.0
Comparable adjustments, cost of product sold	15.2	(18.6)	(1.3)	3.4
Selling, General and Administrative Expense [Abstract]
Restructuring and Related Cost, Incurred Cost	0.0	(24.5)	(5.2)	(26.3)
Transition services agreements activity	(10.0)	(4.8)	(15.5)	(7.6)
Gain (loss) on sale of business	(14.9)	0.0	(16.3)	0.0
Other gains (losses)	5.8	(21.3)	3.7	(21.1)
Selling, General and Administrative Expense	(27.4)	(50.6)	(54.9)	(55.0)
Goodwill impairment	0.0	(2,250.0)	0.0	(2,250.0)
Asset impairment and related expenses	0.0	0.0	(52.1)	0.0
Comparable adjustments, operating income (loss)	(12.2)	(2,319.2)	(108.3)	(2,301.6)
Gain (loss) on sale of assets	4.1	0.0	4.1	0.0
Net loss on foreign currency as a result of the resolution of various tax examinations and assessments	0.0	(20.7)	0.0	(20.7)
Comparable Adjustments | 2025 Restructuring Initiative
Selling, General and Administrative Expense [Abstract]
Restructuring and Related Cost, Incurred Cost	(8.3)	0.0	(21.6)	0.0
Comparable Adjustments | Commodity derivative contracts
Cost of Goods and Services Sold [Abstract]
Net gain (loss) on undesignated commodity derivative contracts	13.0	(24.3)	(4.7)	(9.7)
Settlements of Undesignated Commodity Swap Contracts	$ 4.2	$ 7.0	$ 6.7	$ 15.5