Derivative Financial Instruments and Hedging Activities - Schedule of Fair Value of Derivative Instruments (Detail) - USD ($) $ in Millions	Aug. 31, 2025	May 31, 2025
Derivative [Line Items]
Fair Value of Assets	$ 2.5	$ 5.6
Fair Value of Liabilities	2.5	3.7
Derivatives Designated As Hedging Instruments
Derivative [Line Items]
Fair Value of Assets	0.9	0.5
Fair Value of Liabilities	1.2	1.2
Derivatives Designated As Hedging Instruments | Commodity Contracts
Derivative [Line Items]
Fair Value of Assets	0.2	0.2
Fair Value of Liabilities	1.2	1.2
Derivatives Designated As Hedging Instruments | Commodity Contracts | Receivables
Derivative [Line Items]
Fair Value of Assets	0.2	0.2
Derivatives Designated As Hedging Instruments | Commodity Contracts | Other Assets
Derivative [Line Items]
Fair Value of Assets	0.0	0.0
Derivatives Designated As Hedging Instruments | Commodity Contracts | Other Liabilities
Derivative [Line Items]
Fair Value of Liabilities	0.0	0.0
Derivatives Designated As Hedging Instruments | Foreign Currency Exchange Contracts
Derivative [Line Items]
Fair Value of Assets	0.4	0.3
Fair Value of Liabilities	0.0	0.0
Derivatives Designated As Hedging Instruments | Foreign Currency Exchange Contracts | Receivables
Derivative [Line Items]
Fair Value of Assets	0.4	0.3
Derivatives Designated As Hedging Instruments | Foreign Currency Exchange Contracts | Other Assets
Derivative [Line Items]
Fair Value of Assets	0.0	0.0
Derivatives Designated As Hedging Instruments | Foreign Currency Exchange Contracts | Other Liabilities
Derivative [Line Items]
Fair Value of Liabilities	0.0	0.0
Derivatives Designated As Hedging Instruments | Interest Rate Contract
Derivative [Line Items]
Fair Value of Assets	0.3	0.0
Fair Value of Liabilities	0.0	0.0
Derivatives Designated As Hedging Instruments | Interest Rate Contract | Receivables
Derivative [Line Items]
Fair Value of Assets	0.0	0.0
Derivatives Designated As Hedging Instruments | Interest Rate Contract | Other Assets
Derivative [Line Items]
Fair Value of Assets	0.3	0.0
Derivatives Designated As Hedging Instruments | Interest Rate Contract | Other Liabilities
Derivative [Line Items]
Fair Value of Liabilities	0.0	0.0
Derivatives Not Designated As Hedging Instruments
Derivative [Line Items]
Fair Value of Assets	1.6	5.1
Fair Value of Liabilities	1.3	2.5
Derivatives Not Designated As Hedging Instruments | Commodity Contracts
Derivative [Line Items]
Fair Value of Assets	1.6	1.5
Fair Value of Liabilities	1.3	2.5
Derivatives Not Designated As Hedging Instruments | Commodity Contracts | Receivables
Derivative [Line Items]
Fair Value of Assets	1.6	1.5
Derivatives Not Designated As Hedging Instruments | Commodity Contracts | Other Assets
Derivative [Line Items]
Fair Value of Assets	0.0	0.0
Derivatives Not Designated As Hedging Instruments | Commodity Contracts | Other Liabilities
Derivative [Line Items]
Fair Value of Liabilities	0.0	0.0
Derivatives Not Designated As Hedging Instruments | Foreign Currency Exchange Contracts
Derivative [Line Items]
Fair Value of Assets	0.0	3.6
Fair Value of Liabilities	0.0	0.0
Derivatives Not Designated As Hedging Instruments | Foreign Currency Exchange Contracts | Receivables
Derivative [Line Items]
Fair Value of Assets	0.0	3.6
Derivatives Not Designated As Hedging Instruments | Foreign Currency Exchange Contracts | Other Assets
Derivative [Line Items]
Fair Value of Assets	0.0	0.0
Derivatives Not Designated As Hedging Instruments | Foreign Currency Exchange Contracts | Other Liabilities
Derivative [Line Items]
Fair Value of Liabilities	0.0	0.0
Derivatives Not Designated As Hedging Instruments | Interest Rate Contract
Derivative [Line Items]
Fair Value of Assets	0.0	0.0
Fair Value of Liabilities	0.0	0.0
Derivatives Not Designated As Hedging Instruments | Interest Rate Contract | Receivables
Derivative [Line Items]
Fair Value of Assets	0.0	0.0
Derivatives Not Designated As Hedging Instruments | Interest Rate Contract | Other Assets
Derivative [Line Items]
Fair Value of Assets	0.0	0.0
Derivatives Not Designated As Hedging Instruments | Interest Rate Contract | Other Liabilities
Derivative [Line Items]
Fair Value of Liabilities	0.0	0.0
Accounts Payable | Derivatives Designated As Hedging Instruments | Commodity Contracts
Derivative [Line Items]
Fair Value of Liabilities	1.2	1.2
Accounts Payable | Derivatives Designated As Hedging Instruments | Foreign Currency Exchange Contracts
Derivative [Line Items]
Fair Value of Liabilities	0.0	0.0
Accounts Payable | Derivatives Designated As Hedging Instruments | Interest Rate Contract
Derivative [Line Items]
Fair Value of Liabilities	0.0	0.0
Accounts Payable | Derivatives Not Designated As Hedging Instruments | Commodity Contracts
Derivative [Line Items]
Fair Value of Liabilities	1.3	2.5
Accounts Payable | Derivatives Not Designated As Hedging Instruments | Foreign Currency Exchange Contracts
Derivative [Line Items]
Fair Value of Liabilities	0.0	0.0
Accounts Payable | Derivatives Not Designated As Hedging Instruments | Interest Rate Contract
Derivative [Line Items]
Fair Value of Liabilities	$ 0.0	$ 0.0