Income Taxes (Income before Income Tax, Domestic and Foreign) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Loss before income taxes, U.S.	$ 89.7	$ 78.4	$ 97.3
Loss before income taxes, Non-U.S.	4.4	3.7	(1.6)
Net Income Before Income Tax	$ 94.1	$ 82.1	$ 95.7