Financial Instruments and Risk Management - Derivative Instruments, Gain (Loss) (Details) - Not Designated as Hedging Instrument - Foreign currency contracts - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Mar. 31, 2023 |
Mar. 31, 2022 |
Mar. 31, 2023 |
Mar. 31, 2022 |
Sep. 30, 2022 |
|
| Derivative Instruments, Gain (Loss) [Line Items] | |||||
| Estimated Fair Value Liability | $ (0.2) | $ (0.2) | $ (0.6) | ||
| Gain (Loss) Recognized in Income | $ 0.1 | $ 1.5 | $ 0.6 | $ 3.4 | |