Commitments and Contingent Liabilities - Narrative (Details) $ in Millions	12 Months Ended
	Sep. 30, 2024 USD ($) site	Sep. 30, 2023 USD ($)
Loss Contingencies [Line Items]
Number of Superfund sites designated potentially responsible party at | site	14
Accrual for environmental loss contingencies, net of related receivables	$ 47.8	$ 44.5
Asset retirement obligation, net of recoveries	51.0	38.8
Asbestos Liability
Loss Contingencies [Line Items]
Loss contingency accrual	$ 17.8	$ 20.0