Earnings (Loss) Per Share of Common Stock - Reconciliation of Numerator and Denominator for Basic and Diluted (Loss) Earnings Per Share Calculation (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Net Income (Loss)		$ 66.4	$ (7.7)	$ 14.0
Less: dividends on Series A convertible preferred shares		(35.7)	(3.2)	0.0
Less: Earnings allocated to Convertible Preferred Shares		(11.2)	0.0	0.0
Net income (loss) available to common shareholders		$ 19.5	$ (10.9)	$ 14.0
Weighted average number of common shares outstanding – basic		94,673,000	93,412,000	97,898,000
Basic earnings (loss) per share		$ 0.21	$ (0.12)	$ 0.14
Net income (loss) available to common shareholders - diluted		$ 19.5	$ (10.9)	$ 14.0
Stock compensation awards		1,403,000	0	263,000
Weighted average number of common shares outstanding - diluted		96,076,000	93,412,000	98,161,000
Diluted earnings (loss) per share		$ 0.2	$ (0.12)	$ 0.14
Weighted average number of anti-dilutive Series A convertible preferred shares, options and restricted stock(a)	[1]	56,587,000	9,656,000	5,010,000

[1] Weighted average number of anti-dilutive options is based upon the average closing price of the Company’s common stock on the NYSE for the period.