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Borrowing Arrangements (Components Of Long-Term Debt) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Sep. 30, 2023 | May 28, 2021
--- | --- | --- | ---
Long-term Debt, Gross | $ 451.1 | $ 451.3 |
Deferred financing costs | 3.7 | 3.9 |
Current portion of long-term debt | 0.6 | 0.7 |
Long-term debt | 446.8 | 446.7 |
Unsecured Debt [Member] |  |  |
4.0% Senior Notes | 450.0 | 450.0 |
Long-term Debt, Gross |  |  | $ 450.0
Other [Member] |  |  |
Finance Lease, Liability | $ 1.1 | $ 1.3 |

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