Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Treasury Stock	Retained Earnings (Loss)	Accumulated Other Comprehensive Loss
Beginning balance at Sep. 30, 2022	$ 265.2	$ 0.4	$ 152.1	$ 7.3	$ 235.3	$ (115.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive (loss) income	21.1				10.5	10.6
Dividends on common stock/equity awards	(24.9)				(24.9)
Private placement of common stock	240.7		240.7
Shares issued for stock units, net of shares withheld for taxes	(1.7)		(0.3)	(1.4)
Stock-based compensation	20.6		20.6
Ending balance at Sep. 30, 2023	521.0	0.4	413.1	8.7	220.9	(104.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive (loss) income	(197.8)				(206.1)	8.3
Dividends on common stock/equity awards	(12.6)				(12.6)
Shares issued for stock units, net of shares withheld for taxes	(2.1)		(0.6)	(1.5)
Stock-based compensation	8.1		8.1
Ending balance at Sep. 30, 2024	316.6	0.4	420.6	10.2	2.2	(96.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive (loss) income	(91.3)				(79.8)	(11.5)
Shares issued for stock units, net of shares withheld for taxes	(1.4)		(0.8)	(0.6)
Stock-based compensation	10.2		10.2
Ending balance at Sep. 30, 2025	$ 234.1	$ 0.4	$ 430.0	$ 10.8	$ (77.6)	$ (107.9)