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Borrowing Arrangements Schedule of Long-term Debt Instruments (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Sep. 30, 2016
Debt instrument $ 488.4 $ 490.7
Deferred financing costs 6.6 6.3
Current portion of long-term debt 5.5 5.6
Long-term debt 476.3 478.8
Domestic Line of Credit [Member]    
Debt instrument 0.0 0.0
Secured Debt [Member]    
Debt instrument 487.1 489.4
Other [Member]    
Debt instrument $ 1.3 $ 1.3