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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 ($)
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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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