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Retirement Plans (Net Periodic Benefit Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Defined Benefit Plan, Service Cost $ 0.5 $ 0.4 $ 1.0 $ 0.8
Defined Benefit Plan, Interest Cost 3.6 5.0 7.2 10.1
Defined Benefit Plan, Expected Return on Plan Assets (4.2) (5.1) (8.5) (10.2)
Amortization of actuarial net loss 1.0 0.8 2.0 1.6
Defined Benefit Plan, Net Periodic Benefit Cost other than Service Cost 0.4 0.7 0.7 1.5
Net periodic benefit cost $ 0.9 $ 1.1 $ 1.7 $ 2.3