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Retirement Plans (Net Periodic Benefit Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Defined Benefit Plan, Service Cost $ 0.4 $ 0.4 $ 0.8 $ 0.8
Defined Benefit Plan, Interest Cost 2.5 2.8 5.0 5.6
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (3.9) (4.2) (7.8) (8.4)
Amortization of actuarial net loss 0.6 0.6 1.2 1.3
Defined Benefit Plan, Net Periodic Benefit Cost other than Service Cost (0.8) (0.8) (1.6) (1.5)
Net periodic benefit cost $ (0.4) $ (0.4) $ (0.8) $ (0.7)