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Derivative Financial Instruments and Hedging Activities - Narrative (Details) bbl in Millions, $ in Millions	12 Months Ended
	Aug. 31, 2021 USD ($) bbl	Aug. 31, 2020 USD ($) bbl	Aug. 31, 2019 USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Asset, Noncurrent, Excluding Fair Value Hedges	$ 21.6	$ 21.2
Annual Payment Receivable Contingent On Investment Credit Rating	5.0
Embedded Derivative, Gain on Embedded Derivative	2.5	2.6	$ 2.8
Payments For Credit Rating Decrease	5.0
Embedded Derivative, Fair Value of Embedded Derivative Asset	16.5
Derivative Liability, Noncurrent, Excluding Fair Value Hedges	4.8	$ 5.4
Interest rate swap gain	$ 16.4
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | bbl	2.7	9.7
Foreign exchange derivatives | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	$ 1,200.0

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- Definition

Annual Payment Receivable Contingent On Investment Credit Rating

+ References

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- Definition

Derivative Asset, Noncurrent, Excluding Fair Value Hedges

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- Definition

Derivative Liability, Noncurrent, Excluding Fair Value Hedges

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- Definition

Interest rate swap gain

+ References

No definition available.

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- Definition

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

No definition available.

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

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- Definition

Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as an asset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5624163-113959

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- Definition

Increase in the fair value of the embedded derivative or group of embedded derivatives included in earnings in the period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 15
-URI http://asc.fasb.org/subtopic&trid=2229187

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