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Derivative Instruments - Schedule of Fair Value of Derivatives (Details) - Level 2 - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
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Assets and liabilities measured at fair value on a recurring basis |  |
Net derivative asset / (liability) designated as hedging instruments | $ (12.5) | $ 26.4
Net derivative asset / (liability) not designated as hedging instruments | (3.9) | 11.3
Forward exchange contracts | Other current assets |  |
Assets and liabilities measured at fair value on a recurring basis |  |
Forward exchange contracts designated as hedging instruments | 2.8 | 23.5
Forward exchange contracts not designated as hedging instruments, other current assets | 13.2 | 20.1
Forward exchange contracts | Other assets |  |
Assets and liabilities measured at fair value on a recurring basis |  |
Forward exchange contracts designated as hedging instruments | 1.1 | 5.6
Forward exchange contracts | Other current liabilities |  |
Assets and liabilities measured at fair value on a recurring basis |  |
Forward exchange contracts designated as hedging instruments | (11.8) | (2.0)
Forward exchange contracts not designated as hedging instruments, other current liabilities | (17.1) | (8.8)
Forward exchange contracts | Other liabilities |  |
Assets and liabilities measured at fair value on a recurring basis |  |
Forward exchange contracts designated as hedging instruments | $ (4.6) | $ (0.7)

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