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Borrowing Arrangements (Components Of Long-Term Debt) (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Sep. 30, 2024
May 28, 2021
Long-term Debt, Gross $ 453.5 $ 452.7  
Deferred financing costs 2.7 3.2  
Current portion of long-term debt 1.0 0.8  
Long-term debt 449.8 448.7  
Unsecured Debt [Member]      
4.0% Senior Notes 450.0 450.0  
Long-term Debt, Gross     $ 450.0
Other [Member]      
Finance Lease, Liability $ 3.5 $ 2.7