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Retirement Plans (Pension and Other Postretirement Benefits Activity in Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements $ 16.6 $ (0.5) $ 0.0
Pension Plan, Defined Benefit [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Balance at beginning of year 113.5    
Actuarial gain (17.3)    
Prior year service loss amortization to net periodic cost (20.0)    
Balance at end of year $ 110.8 $ 113.5