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Other (Expense) Income - Schedule of Components of Other Income (Expense) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Components of other income (expense)      
Interest income $ 13.0 $ 15.0 $ 10.0
Royalty income 12.0 11.0 13.0
Net legacy asbestos and environmental charges (154.0) (21.0) (18.0)
Non-operating pension and postretirement benefit credit (cost) (1.0) 20.0 (83.0)
Fair value adjustments for earnout payments (Note 4) 7.0 31.0 0.0
Other 0.0 6.0 7.0
Other (expense) income $ (123.0) $ 62.0 $ (71.0)