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Derivative Instruments - Fair Values of Derivative Instruments (Detail) - USD ($)
$ in Millions
Feb. 28, 2022
Aug. 31, 2021
Designated as Hedging Instrument | Accounts Payable and Accrued Liabilities    
Derivatives Fair Value [Line Items]    
Liability Derivatives $ 10.0 $ 10.3
Designated as Hedging Instrument | Accounts Receivable    
Derivatives Fair Value [Line Items]    
Asset Derivatives 0.7 0.1
Designated as Hedging Instrument | Foreign Exchange Contracts | Accounts Payable and Accrued Liabilities    
Derivatives Fair Value [Line Items]    
Liability Derivatives 4.5 0.3
Designated as Hedging Instrument | Foreign Exchange Contracts | Accounts Receivable    
Derivatives Fair Value [Line Items]    
Asset Derivatives 0.4 0.1
Designated as Hedging Instrument | Interest rate swap contracts | Accounts Payable and Accrued Liabilities    
Derivatives Fair Value [Line Items]    
Liability Derivatives 5.5 10.0
Designated as Hedging Instrument | Interest rate swap contracts | Accounts Receivable    
Derivatives Fair Value [Line Items]    
Asset Derivatives 0.3  
Not Designated as Hedging Instrument | Foreign Exchange Contracts | Accounts Payable and Accrued Liabilities    
Derivatives Fair Value [Line Items]    
Liability Derivatives $ 0.1 $ 0.1