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Retirement Plans (Net Periodic Benefit Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Defined Benefit Plan, Service Cost $ 0.4 $ 0.4 $ 1.2 $ 1.2
Defined Benefit Plan, Interest Cost 2.5 2.8 7.5 8.4
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (3.9) (4.2) (11.7) (12.6)
Amortization of actuarial net loss 0.6 0.7 1.8 2.0
Defined Benefit Plan, Net Periodic Benefit Cost other than Service Cost (0.8) (0.7) (2.4) (2.2)
Net periodic benefit cost $ (0.4) $ (0.3) $ (1.2) $ (1.0)