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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	Mar. 31, 2020	Sep. 30, 2019
Interest Rate Swap February 2021 | AUD
Derivative financial instruments
Notional Amount		$ 200.0
Fixed Rate (as a percent)		2.19%
Interest Rate Swap September 2022 | CAD
Derivative financial instruments
Notional Amount		$ 400.0
Fixed Rate (as a percent)		2.49%
Interest Rate Swap February 2023 | USD
Derivative financial instruments
Notional Amount	$ 200.0	$ 200.0
Fixed Rate (as a percent)	2.60%	2.60%

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

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- Definition

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

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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=109980867&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=109980867&loc=SL5579245-113959

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