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Retirement Plans Schedule of Amounts Expected to Amortize from AOCI to net income in the coming year (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Pension Plan, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Amortization of Gains (Losses)   $ (3.4) $ (3.2) $ (3.5)
Scenario, Forecast [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) $ 0.0      
Defined Benefit Plan, Amortization of Gains (Losses) (4.0)      
Defined Benefit Plans, Expected Future Amortization Into Net Periodic Benefit Cost in Year One $ 4.0