Income Taxes (Schedule of Provisions for Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Currently payable:
Currently payable, United States - Federal	$ (6.8)	$ 6.3	$ 12.5
Currently payable, State	(0.4)	0.2	3.5
Currently payable, Foreign	27.1	25.4	21.5
Currently payable, Total	19.9	31.9	37.5
Deferred:
Deferred, United States - Federal	(14.7)	(4.8)	(4.5)
Deferred, State	(1.8)	1.5	(0.6)
Deferred, Foreign	(5.2)	(6.3)	0.6
Deferred, Total	(21.7)	(9.6)	(4.5)
Income tax provision (benefit)	$ (1.8)	$ 22.3	$ 33.0