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Borrowing Arrangements (Components Of Long-Term Debt) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Sep. 30, 2018
Debt instrument $ 452.0 $ 451.6
Deferred financing costs 6.4 6.6
Current portion of long-term debt 0.8 0.7
Long-term debt 444.8 444.3
Domestic Line of Credit [Member]    
Debt instrument 0.0 0.0
Unsecured Debt [Member]    
5.5% Senior Notes 450.0 450.0
Other [Member]    
Debt instrument $ 2.0 $ 1.6