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Derivative Financial Instruments and Fair Value Measurements (Tables) | 3 Months Ended
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Dec. 31, 2019
Derivative Financial Instruments and Fair Value Measurements |
Notional principle, fixed rates and related expiration dates of outstanding interest rate swap agreements | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2019
Notional Amount | ​ | Notional Amount | ​ | Fixed | ​ | Expiration
Currency |  | (in millions) |  | Rate |  | Date
AUD | ​ | 200.0 | ​ | 2.19% | ​ | February 2021
CAD | ​ | 400.0 | ​ | 2.49% | ​ | September 2022
USD | ​ | 200.0 |  | 2.60% | ​ | February 2023
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2019
Notional Amount | ​ | Notional Amount | ​ | Fixed | ​ | Expiration
Currency |  | (in millions) |  | Rate |  | Date
AUD | ​ | 200.0 |  | 2.19% | ​ | February 2021
CAD | ​ | 400.0 |  | 2.49% | ​ | September 2022
USD | ​ | 200.0 |  | 2.60% | ​ | February 2023

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- Definition Disclosure information pertaining to derivative instruments and fair value measurements. + References No definition available. + Details
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- Definition Tabular disclosure of the notional amounts, fixed rates and related expiration dates of outstanding derivative positions. + References No definition available. + Details
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