Derivative Financial Instruments - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Derivative [Line Items]
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	$ 0.4	$ (2.4)	$ (4.0)	$ (4.2)
Maximum | Forward Contracts | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative maturity			3 months
Maximum | Forward Contracts | Designated as Hedging Instrument | Net Investment Hedging
Derivative [Line Items]
Derivative maturity			3 months
Maximum | Foreign Exchange Options | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative maturity			7 months