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Retirement Plans (Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Retirement Benefits [Abstract]
Service cost	$ 0.7	$ 0.6	$ 0.8
Interest cost	12.0	13.9	13.9
Expected return on plan assets	(14.4)	(13.0)	(13.9)
Amortization of net loss (gain)	2.2	3.1	3.7
Pension expense (benefit) other than service	(0.2)	4.0	3.7
Net periodic cost (benefit)	$ 0.5	$ 4.6	$ 4.5

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