Condensed Consolidated Statements of Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Net Income (Loss) Attributable to Parent [Abstract]
Net revenues	$ 373.4	$ 332.8
Cost of sales	238.6	214.0
Gross profit	134.8	118.8
Selling, general and administrative expenses	74.5	66.0
Net legacy and separation-related expenses	0.1	25.4
Other income, net	(2.6)	(1.9)
Operating income	62.8	29.3
Net pension and other postretirement plan expenses	3.4	3.7
Net interest and other financing expenses	13.6	18.7
Income before income taxes	45.8	6.9
Income tax expense (benefit)	11.9	(20.1)
Income from continuing operations	33.9	27.0
(Loss) income from discontinued operations, net of tax	(2.0)	54.9
Net income	$ 31.9	$ 81.9
NET EARNINGS PER SHARE
Continuing operations, basic earnings per share (usd per share)	$ 0.26	$ 0.16
Discontinued operations, basic earnings per share (usd per share)	(0.02)	0.31
Basic earnings per share (usd per share)	0.24	0.47
Continuing operations, diluted earnings per share (usd per share)	0.26	0.15
Discontinued operations, diluted earnings per share (usd per share)	(0.02)	0.31
Diluted earnings per share (usd per share)	$ 0.24	$ 0.46
Weighted average common shares outstanding
Weighted average common shares outstanding, basic (in shares)	131.8	175.2
Weighted average common shares outstanding, diluted (in shares)	132.7	176.3
COMPREHENSIVE INCOME
Net income	$ 31.9	$ 81.9
Other comprehensive income (loss), net of tax
Currency translation adjustments	6.6	15.2
Amortization of pension and other postretirement plan prior service credits	(0.5)	(0.4)
Unrealized loss on cash flow hedges	(1.9)	(1.3)
Other comprehensive income	4.2	13.5
Comprehensive income	$ 36.1	$ 95.4