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		3 Months Ended		6 Months Ended
		Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Earnings Per Share [Abstract]
Net Income (Loss)		$ 6.4	$ 33.7	$ (4.0)	$ 17.3
Less: Dividends on Series A convertible preferred shares		(8.8)	(8.9)	(17.8)	(17.8)
Less: Earnings allocated to Convertible Preferred Shares		0.0	(9.0)	0.0	0.0
Net (loss) income available to common shareholders		$ (2.4)	$ 15.8	$ (21.8)	$ (0.5)
Weighted average number of common shares outstanding - basic		95,516,000	94,436,000	95,339,000	94,210,000
Basic (loss) earnings per share		$ (0.03)	$ 0.17	$ (0.23)	$ (0.01)
Net (loss) available to common shareholders - diluted		$ (2.4)	$ 15.8	$ (21.8)	$ (0.5)
Stock compensation awards		0	1,275,000	0	0
Weighted average number of common shares outstanding - diluted		95,516,000	95,711,000	95,339,000	94,210,000
Diluted (loss) earnings per share		$ (0.03)	$ 0.17	$ (0.23)	$ (0.01)
Weighted average number of anti-dilutive Series A convertible preferred shares, options and restricted stock(a)	[1]	59,709,000	55,691,000	59,607,000	57,560,000

[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.