Income Taxes (Schedule of Provisions for Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Currently payable:
Currently payable, United States - Federal	$ 12.5	$ 12.4	$ (2.8)
Currently payable, State	3.5	6.6	(0.1)
Currently payable, Foreign	21.5	19.4	22.6
Currently payable, Total	37.5	38.4	19.7
Deferred:
Deferred, United States - Federal	(4.5)	(7.6)	7.9
Deferred, State	(0.6)	(0.6)	0.3
Deferred, Foreign	0.6	(5.6)	1.4
Deferred, Total	(4.5)	(13.8)	9.6
Income tax provision (benefit)	$ 33.0	$ 24.6	$ 29.3