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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