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Derivative Instruments - Pre-tax Amount of Gains (Losses) on Forward Exchange Contracts Not Designated as Hedging Instruments (Details) - Not Designated as Hedging Instrument - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Pre-tax amount of gains (losses) from forward exchange contracts not designated as hedging instruments recognized in the Consolidated Statement of Operations | $ (4.4) | $ (17.6) | $ 39.1
Cost of sales |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Pre-tax amount of gains (losses) from forward exchange contracts not designated as hedging instruments recognized in the Consolidated Statement of Operations | 3.2 | 1.6 | 0.5
Other income (expense) |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Pre-tax amount of gains (losses) from forward exchange contracts not designated as hedging instruments recognized in the Consolidated Statement of Operations | $ (7.6) | $ (19.2) | $ 38.6

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