Condensed Consolidated Statements of Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Net Income (Loss) Attributable to Parent [Abstract]
Net revenues	$ 376.2	$ 317.4	$ 1,053.5	$ 900.7
Cost of sales	225.5	189.6	657.3	553.4
Gross profit	150.7	127.8	396.2	347.3
Selling, general and administrative expenses	65.6	59.2	194.2	182.6
Net legacy and separation-related expenses	1.6	9.9	30.8	18.9
Other income, net	(3.0)	(2.4)	(5.8)	(7.3)
Operating income	86.5	61.1	177.0	153.1
Net pension and other postretirement plan expense (income)	3.7	(9.2)	11.0	(27.7)
Net interest and other financing (income) expense	(4.6)	17.3	27.4	51.2
Income before income taxes	87.4	53.0	138.6	129.6
Income tax expense	22.9	13.2	14.2	32.6
Income from continuing operations	64.5	39.8	124.4	97.0
(Loss) income from discontinued operations	(2.9)	58.4	1,246.4	169.6
Net income	$ 61.6	$ 98.2	$ 1,370.8	$ 266.6
NET EARNINGS PER SHARE
Continuing operations, basic earnings per share (usd per share)	$ 0.40	$ 0.22	$ 0.74	$ 0.54
Discontinued operations, basic earnings per share (usd per share)	(0.02)	0.33	7.35	0.94
Basic earnings per share (usd per share)	0.38	0.55	8.09	1.48
Continuing operations, diluted earnings per share (usd per share)	0.40	0.22	0.73	0.53
Discontinued operations, diluted earnings per share (usd per share)	(0.02)	0.33	7.31	0.94
Diluted earnings per share (usd per share)	$ 0.38	$ 0.55	$ 8.04	$ 1.47
Weighted average common shares outstanding
Weighted average common shares outstanding, basic (in shares)	161.5	178.6	169.5	179.6
Weighted average common shares outstanding, diluted (in shares)	162.5	179.8	170.6	180.9
COMPREHENSIVE INCOME
Net income	$ 61.6	$ 98.2	$ 1,370.8	$ 266.6
Other comprehensive income (loss), net of tax
Currency translation adjustments	1.0	(19.4)	45.5	(19.7)
Amortization of pension and other postretirement plan prior service credits	(0.4)	(0.5)	(1.3)	(1.3)
Unrealized (loss) gain on cash flow hedges	(1.5)	1.9	(5.9)	10.3
Other comprehensive (loss) income	(0.9)	(18.0)	38.3	(10.7)
Comprehensive income	$ 60.7	$ 80.2	$ 1,409.1	$ 255.9