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Borrowing Arrangements (Components Of Long-Term Debt) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Sep. 30, 2017
Debt instrument $ 451.9 $ 486.5
5.5% Senior Notes 450.0 0.0
Deferred financing costs 6.6 5.9
Current portion of long-term debt 0.8 5.6
Long-term debt 444.5 475.0
Domestic Line of Credit [Member]    
Debt instrument 0.0 0.0
Secured Debt [Member]    
Debt instrument 0.0 484.8
Other [Member]    
Debt instrument $ 1.9 $ 1.7