Retirement Plans (Schedule of Amounts to be Amortized From Accumulated Other Comprehensive Income) (Details) $ in Millions	12 Months Ended
	Sep. 30, 2016 USD ($)
Pension Benefits
Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year [Abstract]
Amortization of net actuarial loss	$ 14.1
Amortization of prior service cost	0.3
Postretirement Benefits
Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year [Abstract]
Amortization of net actuarial loss	0.1
Amortization of prior service cost	$ (2.1)