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Retirement Plans (Net Periodic Benefit Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan, Service Cost $ 0.5 $ 0.4
Defined Benefit Plan, Interest Cost 3.6 5.1
Defined Benefit Plan, Expected Return on Plan Assets (4.3) (5.1)
Amortization of actuarial net loss 1.0 0.8
Net periodic benefit cost $ 0.8 $ 1.2