Derivative Financial Instruments and Hedging Activities - Schedule of Fair Value of Derivative Instruments (Detail) - USD ($) $ in Millions	Nov. 30, 2024	May 31, 2024
Derivative [Line Items]
Asset Derivatives at Fair Value	$ 1.0	$ 3.6
Liability Derivatives at Fair Value	4.0	4.4
Derivatives Designated As Hedging Instruments
Derivative [Line Items]
Asset Derivatives at Fair Value	0.1
Liability Derivatives at Fair Value	2.9
Derivatives Designated As Hedging Instruments | Commodity Contracts
Derivative [Line Items]
Asset Derivatives at Fair Value	0.1	0.2
Liability Derivatives at Fair Value	2.8	1.9
Derivatives Designated As Hedging Instruments | Commodity Contracts | Receivables
Derivative [Line Items]
Asset Derivatives at Fair Value	0.1	0.2
Derivatives Designated As Hedging Instruments | Commodity Contracts | Other Assets
Derivative [Line Items]
Asset Derivatives at Fair Value	0.0	0.0
Derivatives Designated As Hedging Instruments | Commodity Contracts | Other Liabilities
Derivative [Line Items]
Liability Derivatives at Fair Value	0.2	0.0
Derivatives Designated As Hedging Instruments | Foreign Currency Exchange Contracts | Receivables
Derivative [Line Items]
Asset Derivatives at Fair Value	0.0
Derivatives Not Designated As Hedging Instruments
Derivative [Line Items]
Asset Derivatives at Fair Value	0.9
Liability Derivatives at Fair Value	1.1
Derivatives Not Designated As Hedging Instruments | Commodity Contracts
Derivative [Line Items]
Asset Derivatives at Fair Value	0.9	3.4
Liability Derivatives at Fair Value	1.1	2.5
Derivatives Not Designated As Hedging Instruments | Commodity Contracts | Receivables
Derivative [Line Items]
Asset Derivatives at Fair Value	0.8	3.4
Derivatives Not Designated As Hedging Instruments | Commodity Contracts | Other Assets
Derivative [Line Items]
Asset Derivatives at Fair Value	0.1	0.0
Derivatives Not Designated As Hedging Instruments | Commodity Contracts | Other Liabilities
Derivative [Line Items]
Liability Derivatives at Fair Value	0.0	0.0
Derivatives Not Designated As Hedging Instruments | Foreign Currency Exchange Contracts | Receivables
Derivative [Line Items]
Asset Derivatives at Fair Value	0.0
Accounts Payable | Derivatives Designated As Hedging Instruments | Commodity Contracts
Derivative [Line Items]
Liability Derivatives at Fair Value	2.6	1.9
Accounts Payable | Derivatives Designated As Hedging Instruments | Foreign Currency Exchange Contracts
Derivative [Line Items]
Liability Derivatives at Fair Value	0.1
Accounts Payable | Derivatives Not Designated As Hedging Instruments | Commodity Contracts
Derivative [Line Items]
Liability Derivatives at Fair Value	1.1	$ 2.5
Accounts Payable | Derivatives Not Designated As Hedging Instruments | Foreign Currency Exchange Contracts
Derivative [Line Items]
Liability Derivatives at Fair Value	$ 0.0