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Retirement Plans (Components of Accumulated Other Comprehensive Income (Loss) Related to Pension and Other Postretirement Benefits) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Pension Plan, Defined Benefit [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Defined Benefit Plan, Amortization of Gains (Losses)   $ 3.2 $ 3.5 $ 9.0
Scenario, Forecast [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) $ 0.1      
Defined Benefit Plan, Amortization of Gains (Losses) 3.1      
Defined Benefit Plans, Expected Future Amortization Into Net Periodic Benefit Cost in Year One $ 3.2