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%