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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
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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

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