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Borrowing Arrangements (Components Of Long-Term Debt) (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Sep. 30, 2021
--- | --- | ---
Debt instrument | $ 452.1 | $ 452.2
Deferred financing costs | (5.0) | (5.3)
Current portion of long-term debt | (1.0) | (1.0)
Long-term debt | 446.1 | 445.9
Unsecured Debt [Member] |  |
5.5% Senior Notes | 450.0 | 450.0
Other [Member] |  |
Debt instrument | $ 2.1 | $ 2.2

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