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