Condensed Consolidated Statements of Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Net Income (Loss) Attributable to Parent [Abstract]
Net revenues	$ 403.2	$ 388.7	$ 817.5	$ 762.1
Cost of sales	252.7	242.5	514.1	481.1
Gross profit	150.5	146.2	303.4	281.0
Selling, general and administrative expenses	86.3	72.3	169.1	146.8
Net legacy and separation-related expenses	0.8	0.0	1.2	0.1
Other income, net	(3.5)	(2.5)	(77.6)	(5.1)
Operating income	66.9	76.4	210.7	139.2
Net pension and other postretirement plan (income) expenses	(0.9)	3.6	(1.8)	7.0
Net interest and other financing expenses	16.9	15.5	34.4	29.1
Income before income taxes	50.9	57.3	178.1	103.1
Income tax expense	12.6	14.0	45.9	25.9
Income from continuing operations	38.3	43.3	132.2	77.2
Loss from discontinued operations, net of tax	(0.7)	(1.9)	(3.0)	(3.9)
Net income	$ 37.6	$ 41.4	$ 129.2	$ 73.3
NET EARNINGS PER SHARE
Continuing operations, basic earnings (loss) per share (usd per share)	$ 0.30	$ 0.33	$ 1.03	$ 0.59
Discontinued operations, basic earnings (loss) per share (usd per share)	(0.01)	(0.01)	(0.02)	(0.03)
Basic earnings per share (usd per share)	0.29	0.32	1.01	0.56
Continuing operations, diluted earnings (loss) per share (usd per share)	0.30	0.33	1.02	0.59
Discontinued operations, diluted earnings (loss) per share (usd per share)	(0.01)	(0.01)	(0.02)	(0.03)
Diluted earnings per share (usd per share)	$ 0.29	$ 0.32	$ 1.00	$ 0.56
Weighted average common shares outstanding
Basic (in shares)	127.6	129.8	128.2	130.8
Diluted (in shares)	128.2	130.7	128.9	131.7
COMPREHENSIVE INCOME
Net income	$ 37.6	$ 41.4	$ 129.2	$ 73.3
Other comprehensive (loss) income, net of tax
Currency translation adjustments	(0.1)	(2.5)	(6.6)	4.1
Amortization of pension and other postretirement plan prior service credits	(0.4)	(0.4)	(0.8)	(0.9)
Unrealized loss on cash flow hedges	0.0	(1.4)	0.0	(3.3)
Other comprehensive loss	(0.5)	(4.3)	(7.4)	(0.1)
Comprehensive income	$ 37.1	$ 37.1	$ 121.8	$ 73.2