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Derivative Financial Instruments and Hedging Activities (Foreign Currency Risk Management) (Details) - Forward contracts - USD ($)
$ in Millions
Aug. 31, 2019
Aug. 31, 2018
Cash flow hedging    
Derivative [Line Items]    
Aggregate notional amount $ 2,500.0 $ 2,300.0
Forward foreign exchange contracts    
Derivative [Line Items]    
Aggregate notional amount $ 334.1 $ 293.4