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Borrowing Arrangements (Components Of Long-Term Debt) (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Sep. 30, 2017
Debt instrument $ 484.2 $ 486.5
Deferred financing costs 5.2 5.9
Current portion of long-term debt 5.6 5.6
Long-term debt 473.4 475.0
Domestic Line of Credit [Member]    
Debt instrument 0.0 0.0
Secured Debt [Member]    
Debt instrument 482.6 484.8
Other [Member]    
Debt instrument $ 1.6 $ 1.7