XML 106 R96.htm IDEA: XBRL DOCUMENT v3.19.3
Derivative Financial Instruments and Hedging Activities - Narrative (Details)
bbl in Millions, $ in Millions
3 Months Ended 12 Months Ended
Nov. 30, 2016
USD ($)
Aug. 31, 2019
USD ($)
bbl
Aug. 31, 2018
USD ($)
bbl
Aug. 31, 2017
USD ($)
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Asset, Noncurrent, Excluding Fair Value Hedges   $ 26.6 $ 23.1  
Annual Payment Receivable Contingent On Investment Credit Rating   5.0    
Embedded Derivative, Gain on Embedded Derivative   2.8 3.1 $ 30.5
Payments For Credit Rating Decrease $ 5.0      
Embedded Derivative, Fair Value of Embedded Derivative Asset   21.4    
Derivative Liability, Noncurrent, Excluding Fair Value Hedges   $ 7.4 $ 7.9  
Cash Flow Hedging [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, Nonmonetary Notional Amount, Volume | bbl   7.7 1.1  
Foreign exchange derivatives | Not Designated as Hedging Instrument        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, Notional Amount   $ 894.7 $ 988.8  
Interest rate swap derivatives | Designated as Hedging Instrument | Fair Value Hedging [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, Notional Amount   $ 365.0 $ 495.0