Indicates line item in statement of income or comprehensive income that includes gain (loss) from derivative.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Nominal or face amount used to calculate payment on derivative.

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The number of derivative instruments of a particular group held by the entity.

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Amount of unrealized gain (loss) related to derivatives designated as cash flow hedging instruments, recorded in results of operations to the extent that the cash flow hedge is determined to be ineffective.

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Financial Instruments and Risk Management (Narrative) (Details) $ in Millions	3 Months Ended			6 Months Ended
	Mar. 31, 2024 USD ($) contracts	Dec. 31, 2023 USD ($)	Mar. 31, 2023	Mar. 31, 2024 USD ($) contracts	Mar. 31, 2023	Sep. 30, 2023 USD ($)
Derivative [Line Items]
Long-term debt	$ 1,361.0			$ 1,361.0		$ 1,372.0
Fixed rate
Derivative [Line Items]
Long-term debt	1,250.0			1,250.0		1,250.0
Fair value of long-term debt	$ 1,127.9			$ 1,127.9		$ 1,028.6
Not designated as hedge \| FX contract
Derivative [Line Items]
Open foreign currency contracts \| contracts	2			2
Derivative, notional amount	$ 9.0			$ 9.0
Not designated as hedge \| FX contract \| Other expense (income), net
Derivative [Line Items]
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]
Cash flow hedge \| Designated as hedge \| FX contract
Derivative [Line Items]
Open foreign currency contracts \| contracts	64			64
Derivative, notional amount	$ 108.1			$ 108.1
Gain (loss) recognized in OCI		$ 4.4		$ 3.4