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Debt Components of Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Sep. 30, 2016
Debt Disclosure [Abstract]    
Short-term borrowings $ 0.0 $ 0.0
Current portion of long-term debt 5.8 5.8
Long-term debt 977.0 980.3
Total Debt 982.8 $ 986.1
Foreign Lines of Credit    
Short-term Debt [Line Items]    
Availability under line of credit $ 20.2