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Financial Derivatives (Narrative) (Details) € in Millions, R in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Feb. 29, 2020 USD ($) | Feb. 28, 2019 USD ($) | Feb. 29, 2020 USD ($) | Feb. 28, 2019 USD ($) | Feb. 29, 2020 EUR (€) | Aug. 31, 2019 USD ($) | Aug. 31, 2019 EUR (€) | Feb. 28, 2019 EUR (€) | Feb. 28, 2019 ZAR (R)
Foreign Exchange Forward [Member] | Derivatives Not Designated As Hedging Instruments [Member] |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Outstanding foreign currency forward contracts | $ 0.0 | $ 2.0 | $ 0.0 | $ 2.0 |  | $ 1.8 |  |  |
Fair Value Hedging [Member] |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Realized and unrealized gains, net of related income tax effects | 7.2 | 5.7 | 7.2 | 5.7 |  | $ 7.0 |  |  |
Net Investment Hedging [Member] |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Foreign currency translation forward contracts, after tax net gain | 0.0 | 0.2 | 0.8 | 0.9 |  |  |  |  |
Derivative contracts ineffective amount | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 |  |  |  |  |
Outstanding foreign currency forward contracts |  |  |  |  | € 32.7 |  | € 32.7 | € 32.7 | R 43.0

X
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- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=109977999&loc=d3e76258-113986 + Details
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