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Financial Derivatives (Narrative) (Details)
€ in Millions, £ in Millions, R in Millions, $ in Millions
3 Months Ended 9 Months Ended
May 31, 2020
USD ($)
May 31, 2019
USD ($)
May 31, 2020
USD ($)
May 31, 2019
USD ($)
May 31, 2020
GBP (£)
Aug. 31, 2019
USD ($)
Aug. 31, 2019
EUR (€)
May 31, 2019
EUR (€)
May 31, 2019
ZAR (R)
Foreign Exchange Forward [Member] | Derivatives Not Designated As Hedging Instruments [Member]                  
Derivatives, Fair Value [Line Items]                  
Outstanding foreign currency forward contracts $ 8.5 $ 1.9 $ 8.5 $ 1.9   $ 1.8      
Foreign Exchange Option Contract [Member] | Derivatives Not Designated As Hedging Instruments [Member]                  
Derivatives, Fair Value [Line Items]                  
Outstanding foreign currency forward contracts | £         £ 15        
Fair Value Hedging [Member]                  
Derivatives, Fair Value [Line Items]                  
Realized and unrealized gains, net of related income tax effects 7.3 6.3 7.3 6.3   $ 7.0      
Net Investment Hedging [Member]                  
Derivatives, Fair Value [Line Items]                  
Foreign currency translation forward contracts, after tax net gain 0.3 0.6 1.1 1.5          
Derivative contracts ineffective amount 0.0 $ 0.0 0.0 $ 0.0          
Outstanding foreign currency forward contracts $ 0.0   $ 0.0       € 32.7 € 32.7 R 43.0