Financial Instruments and Risk Management (Narrative) (Details) $ in Millions	Jun. 30, 2023 USD ($) contracts	Sep. 30, 2022 USD ($)
Derivative [Line Items]
Long-term debt	$ 1,335.0	$ 1,405.0
Fixed rate
Derivative [Line Items]
Long-term debt	1,250.0	1,250.0
Fair value of long-term debt	$ 1,010.1	945.9
Not designated as hedge \| FX contract
Derivative [Line Items]
Open foreign currency contracts \| contracts	5
Derivative, notional amount	$ 34.6
Cash flow hedge \| Designated as hedge \| FX contract
Derivative [Line Items]
Estimated fair value of derivative	$ 2.4	$ 11.3
Open foreign currency contracts \| contracts	64
Derivative, notional amount	$ 107.6

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

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