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v3.20.2

Derivative Financial Instruments and Hedging Activities - Narrative (Details) bbl in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2017 USD ($) | Aug. 31, 2020 USD ($) bbl | Aug. 31, 2019 USD ($) bbl | Aug. 31, 2018 USD ($)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative Asset, Noncurrent, Excluding Fair Value Hedges |  | $ 21.2 | $ 26.6 |
Annual Payment Receivable Contingent On Investment Credit Rating |  | 5.0 |  |
Embedded Derivative, Gain on Embedded Derivative |  | 2.6 | 2.8 | $ 3.1
Payments For Credit Rating Decrease | $ 5.0 |  |  |
Embedded Derivative, Fair Value of Embedded Derivative Asset |  | 19.0 |  |
Derivative Liability, Noncurrent, Excluding Fair Value Hedges |  | 5.4 | $ 7.4 |
Interest rate swap gain |  | $ 16.4 |  |
Cash Flow Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative, Nonmonetary Notional Amount, Volume | bbl |  | 9.7 | 7.7 |
Foreign exchange derivatives | Not Designated as Hedging Instrument |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative, Notional Amount |  | $ 1,200.0 | $ 894.7 |
Interest rate swap derivatives | Designated as Hedging Instrument | Fair Value Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative, Notional Amount |  | $ 365.0 |  |

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