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Financial Instruments and Risk Management (Narrative) (Details) $ in Millions	3 Months Ended			6 Months Ended
	Mar. 31, 2025 USD ($) contracts	Dec. 31, 2024 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2025 USD ($) contracts	Mar. 31, 2024 USD ($)	Sep. 30, 2024 USD ($)
Derivative [Line Items]
Long-term debt	$ 1,441.0			$ 1,441.0		$ 1,284.0
Fixed rate
Derivative [Line Items]
Long-term debt	1,250.0			1,250.0		1,250.0
Fair value of long-term debt	$ 1,148.4			$ 1,148.4		$ 1,180.0
Not designated as hedge \| FX contract
Derivative [Line Items]
Open foreign currency contracts \| contracts	1			1
Derivative, notional amount	$ 9.0			$ 9.0
Gain (loss) recognized in income	$ 0.3		$ 1.7	$ 0.6	$ 0.6
Cash flow hedge \| Designated as hedge \| FX contract
Derivative [Line Items]
Open foreign currency contracts \| contracts	64			64
Derivative, notional amount	$ 115.8			$ 115.8
Gain (loss) recognized in OCI		$ (2.4)		$ 0.7