Condensed Consolidated Statements of Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Net Income (Loss) Attributable to Parent [Abstract]
Net revenues	$ 332.8	$ 287.3
Cost of sales	214.0	175.1
Gross profit	118.8	112.2
Selling, general and administrative expenses	66.0	60.2
Net legacy and separation-related expenses	25.4	2.8
Other income, net	(1.9)	(2.8)
Operating income	29.3	52.0
Net pension and other postretirement plan expense (income)	3.7	(9.3)
Net interest and other financing expenses	18.7	17.0
Income before income taxes	6.9	44.3
Income tax (benefit) expense	(20.1)	10.1
Income from continuing operations	27.0	34.2
Income from discontinued operations	54.9	52.8
Net income	$ 81.9	$ 87.0
NET EARNINGS PER SHARE
Continuing operations, basic earnings per share (usd per share)	$ 0.16	$ 0.19
Discontinued operations, basic earnings per share (usd per share)	0.31	0.29
Basic earnings per share (usd per share)	0.47	0.48
Continuing operations, diluted earnings per share (usd per share)	0.15	0.19
Discontinued operations, diluted earnings per share (usd per share)	0.31	0.29
Diluted earnings per share (usd per share)	$ 0.46	$ 0.48
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING
Weighted average common shares outstanding, basic (in shares)	175.2	180.5
Weighted average common shares outstanding, diluted (in shares)	176.3	182.0
COMPREHENSIVE INCOME
Net income	$ 81.9	$ 87.0
Other comprehensive income (loss), net of tax
Currency translation adjustments	15.2	0.3
Amortization of pension and other postretirement plan prior service credits	(0.4)	(0.4)
Unrealized (loss) gain on cash flow hedges	(1.3)	2.2
Other comprehensive income	13.5	2.1
Comprehensive income	$ 95.4	$ 89.1