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Derivative Financial Instruments and Fair Value Measurements - Cash Flow Hedges (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Sep. 30, 2021
--- | --- | ---
Derivative financial instruments |  |
Fixed Rate (as a percent) | 1.349% |
Interest Rate Swap |  |
Derivative financial instruments |  |
Notional Amount |  | $ 400.0
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap | USD | March 2018 |  |
Derivative financial instruments |  |
Notional Amount | $ 200.0 | $ 200.0
Fixed Rate (as a percent) | 2.60% | 2.60%
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap | USD | February 2023 |  |
Derivative financial instruments |  |
Notional Amount | $ 400.0 | $ 400.0
Fixed Rate (as a percent) | 1.349% | 1.349%

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