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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY/(DEFICIT) - USD ($) shares in Thousands, $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained (Losses)/Earnings	Accumulated Other Comprehensive (Loss)/Income	Treasury Stock
Beginning balance (in shares) at Sep. 30, 2023		71,500
Beginning balance at Sep. 30, 2023	$ 210.7	$ 0.8	$ 750.5	$ (164.8)	$ (137.7)	$ (238.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	1.9			1.9
Share-based payments	6.4		6.4
Activity under stock plans (in shares)		277
Activity under stock plans	(4.7)		(16.3)	(1.4)		13.0
Dividends to common shareholders	(22.1)		(22.1)
Other comprehensive income	(21.6)				(21.6)
Ending balance (in shares) at Dec. 31, 2023		71,777
Ending balance at Dec. 31, 2023	170.6	$ 0.8	718.5	(164.3)	(159.3)	(225.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings	22.1		22.1
Beginning balance (in shares) at Sep. 30, 2024		71,810
Beginning balance at Sep. 30, 2024	135.8	$ 0.8	667.6	(128.4)	(180.6)	(223.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	22.3			22.3
Share-based payments	6.3		6.3
Activity under stock plans (in shares)		371
Activity under stock plans	(7.5)		(22.7)	(2.0)		17.2
Dividends to common shareholders	(22.0)		(22.0)
Other comprehensive income	5.7				5.7
Ending balance (in shares) at Dec. 31, 2024		72,181
Ending balance at Dec. 31, 2024	140.6	$ 0.8	629.2	$ (108.1)	$ (174.9)	$ (206.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings	$ 22.0		$ 22.0

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