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Financial Instruments (Effects of Derivatives Not Designated as a Hedging Instrument) (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Other Income (Expense), Net |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total (Gain) Loss Recognized in Income | $ 4.0 | $ (1.6) | $ (2.7) | $ (1.3)
Other Income (Expense), Net | Forward exchange contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total (Gain) Loss Recognized in Income | 4.0 | (1.6) | (2.7) | (1.3)
Other Income (Expense), Net | De-designated interest rate swap |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total (Gain) Loss Recognized in Income | 0.0 | 0.0 | 0.0 | 0.0
Other Income (Expense), Net | Other |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total (Gain) Loss Recognized in Income | 0.0 | 0.0 | 0.0 | 0.0
Other Non-Operating Income (Expense), Net |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total (Gain) Loss Recognized in Income | 0.1 | (9.5) | (29.7) | (10.3)
Other Non-Operating Income (Expense), Net | Forward exchange contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total (Gain) Loss Recognized in Income | 0.0 | (0.5) | (0.8) | (1.4)
Other Non-Operating Income (Expense), Net | De-designated interest rate swap |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total (Gain) Loss Recognized in Income | 0.1 | (8.9) | (27.2) | (8.9)
Other Non-Operating Income (Expense), Net | Other |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total (Gain) Loss Recognized in Income | $ 0.0 | $ (0.1) | $ (1.7) | $ 0.0

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