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Derivative Financial Instruments and Hedging Activities - Narrative (Details) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Nov. 30, 2017 USD ($) | Nov. 30, 2016 USD ($) | May 31, 2016 USD ($) derivative | Feb. 29, 2016 USD ($) derivative | Nov. 30, 2015 USD ($) derivative | Aug. 31, 2018 USD ($) | Aug. 31, 2017 USD ($) | Aug. 31, 2015 USD ($)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
Derivative Asset, Noncurrent, Excluding Fair Value Hedges |  |  |  |  |  | $ 23.1 | $ 30.9 |
Annual Payment Receivable Contingent On Investment Credit Rating |  |  |  |  |  | 5.0 |  |
Embedded Derivative, Gain on Embedded Derivative |  | $ 29.1 |  |  |  |  | 30.5 |
Payments For Credit Rating Decrease | $ 5.0 | $ 5.0 |  |  |  |  |  |
Embedded Derivative, Fair Value of Embedded Derivative Asset |  |  |  |  |  | 23.6 |  |
Derivative Liability, Noncurrent, Excluding Fair Value Hedges |  |  |  |  |  | 7.9 | 12.3 |
Foreign exchange derivatives | Not Designated as Hedging Instrument |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  | 988.8 | $ 776.7 |
Interest rate swap derivatives | Designated as Hedging Instrument | Fair Value Hedging [Member] |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  | $ 495.0 |  |
Interest rate swap derivatives | Designated as Hedging Instrument | Cash Flow Hedging [Member] |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  |  |  | $ 300.0
Cash paid to settle derivatives |  |  | $ 5.1 | $ 5.3 | $ 6.4 |  |  |
Derivatives settled, number | derivative |  |  | 2 | 2 | 2 |  |  |

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- Definition Cash paid to settle derivatives + References No definition available. + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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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=109980867&loc=SL5624163-113959 + Details
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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 + Details
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