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Derivative Financial Instruments and Fair Value Measurements - Cash Flow Hedges (Details) - Designated as Hedging Instrument - Cash Flow Hedging - USD ($) $ in Millions | Jun. 30, 2020 | Sep. 30, 2019
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AUD |  |
Derivative financial instruments |  |
Notional Amount |  | $ 200.0
Fixed Rate (as a percent) |  | 2.19%
CAD |  |
Derivative financial instruments |  |
Notional Amount |  | $ 400.0
Fixed Rate (as a percent) |  | 2.49%
USD |  |
Derivative financial instruments |  |
Notional Amount | $ 200.0 | $ 200.0
Fixed Rate (as a percent) | 2.60% | 2.60%

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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=121590274&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=121590274&loc=SL5579245-113959 + Details
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