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Borrowing Arrangements (Components Of Long-Term Debt) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Sep. 30, 2020
Debt instrument	$ 452.1	$ 452.5
Deferred financing costs	(4.5)	(4.9)
Current portion of long-term debt	(1.0)	(1.1)
Long-term debt	446.6	446.5
Unsecured Debt [Member]
5.5% Senior Notes	450.0	450.0
Other [Member]
Debt instrument	$ 2.1	$ 2.5

X

- Definition

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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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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