Income Taxes (Schedule of Source of Pre-Tax Earnings) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Earnings (loss) from continuing operations before income taxes, domestic	$ 37.6	$ 2.6	$ (10.4)
Earnings (loss) from continuing operations before income taxes, foreign	110.1	121.5	157.5
Earnings (loss) before income taxes	$ 147.7	$ 124.1	$ 147.1