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Other Income (Expense) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Other Income and Expenses [Abstract] |  |  |  |
Interest income | $ 3.1 | $ 1.5 | $ 11.6 | $ 4.1
Royalty income | 2.8 | 3.4 | 9.0 | 9.3
Legacy product liability and environmental charges | (3.4) | (4.8) | (11.1) | (10.7)
Non-operating pension and postretirement benefit credit (cost) | 4.9 | 5.5 | 14.7 | (87.5)
Other | (0.6) | 0.9 | 6.3 | 1.5
Other income (expense) | $ 6.8 | $ 6.5 | $ 30.5 | $ (83.3)

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