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Retirement Plans (Net Periodic Benefit Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Plan, Service Cost $ 0.2 $ 0.2
Defined Benefit Plan, Interest Cost 3.0 3.5
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (3.6) (3.3)
Amortization of actuarial net loss 0.6 0.8
Defined Benefit Plan, Net Periodic Benefit Cost other than Service Cost 0.0 1.0
Net periodic benefit cost 0.2 $ 1.2
Other comprehensive income (loss), pension income tax effects $ (0.2)