Derivative Financial Instruments and Hedging Activities (Details 2) - USD ($) $ in Millions	Sep. 30, 2017	Sep. 30, 2016
Other Current Assets
Fair values of open derivative instruments
Fair value of derivative assets	$ 0.8	$ 0.1
Other Current Liabilities
Fair values of open derivative instruments
Fair value of derivative liabilities	1.9	0.8
Not designated as hedging instruments | Foreign exchange contracts | Other Current Assets
Fair values of open derivative instruments
Fair value of derivative assets	0.5	0.1
Not designated as hedging instruments | Foreign exchange contracts | Other Current Liabilities
Fair values of open derivative instruments
Fair value of derivative liabilities	0.8	0.4
Not designated as hedging instruments | Interest Rate Contract [Member] | Other Current Assets
Fair values of open derivative instruments
Fair value of derivative assets	0.3	0.0
Not designated as hedging instruments | Interest Rate Contract [Member] | Other Current Liabilities
Fair values of open derivative instruments
Fair value of derivative liabilities	0.7	0.4
Cash Flow Hedging [Member] | Designated as hedging instrument | Foreign exchange contracts | Other Current Assets
Fair values of open derivative instruments
Fair value of derivative assets	0.0	0.0
Cash Flow Hedging [Member] | Designated as hedging instrument | Foreign exchange contracts | Other Current Liabilities
Fair values of open derivative instruments
Fair value of derivative liabilities	$ 0.4	$ 0.0