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Derivative Financial Instruments and Fair Value Measurements - Cash Flow Hedges (Details) $ in Millions, $ in Millions, $ in Millions	Sep. 30, 2019 AUD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 CAD ($)	Sep. 30, 2018 AUD ($)	Sep. 30, 2018 USD ($)
Interest rate swap agreements | AUD
Derivative financial instruments
Notional Amount		$ 200.0		$ 200.0
Fixed Rate (as a percent)	2.19%	2.19%	2.19%	2.19%	2.19%
Interest rate swap agreements | CAD
Derivative financial instruments
Notional Amount		$ 400.0	$ 400.0
Fixed Rate (as a percent)	2.49%	2.49%	2.49%	2.49%	2.49%
Interest rate swap agreements | USD
Derivative financial instruments
Notional Amount		$ 200.0			$ 200.0
Fixed Rate (as a percent)	2.60%	2.60%	2.60%	2.60%	2.60%
Designated as Hedging Instrument | Cash Flow Hedging | Foreign currency forward contracts | AUD
Derivative financial instruments
Notional Amount	$ 23.2	$ 17.4		$ 65.2	$ 49.1

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- Definition

Fixed interest rate related to the interest rate derivative.

+ 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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