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Borrowing Arrangements (Components Of Long-Term Debt) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Sep. 30, 2024	May 28, 2021
Long-term Debt, Gross	$ 452.5	$ 452.7
Deferred financing costs	3.0	3.2
Current portion of long-term debt	0.8	0.8
Long-term debt	448.7	448.7
Unsecured Debt [Member]
4.0% Senior Notes	450.0	450.0
Long-term Debt, Gross			$ 450.0
Other [Member]
Finance Lease, Liability	$ 2.5	$ 2.7

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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