Consolidated Statements of Comprehensive Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Net Income (Loss) Attributable to Parent [Abstract]
Net revenues	$ 1,619.0	$ 1,443.5	$ 1,236.1
Cost of sales	1,000.2	899.0	759.7
Gross profit	618.8	544.5	476.4
Selling, general and administrative expenses	305.1	264.5	244.7
Net legacy and separation-related (income) expenses	(0.7)	32.8	20.5
Other income, net	(52.8)	0.0	(9.1)
Operating income	367.2	247.2	220.3
Net pension and other postretirement plan expense (income)	11.7	(27.6)	6.9
Net interest and other financing expenses	71.9	38.3	69.3
Total income before income taxes	283.6	236.5	144.1
Income tax expense	69.1	37.1	34.7
Income from continuing operations	214.5	199.4	109.4
(Loss) income from discontinued operations, net of tax	(3.0)	1,220.3	314.9
Net income	$ 211.5	$ 1,419.7	$ 424.3
NET EARNINGS PER SHARE
Continuing operations, basic earnings per share (usd per share)	$ 1.65	$ 1.24	$ 0.61
Discontinued operations, basic earnings per share (usd per share)	(0.02)	7.55	1.76
Basic earnings per share (usd per share)	1.63	8.79	2.37
Continuing operations, diluted earnings per share (usd per share)	1.63	1.23	0.61
Discontinued operations, diluted earnings per share (usd per share)	(0.02)	7.50	1.74
Diluted earnings per share (usd per share)	$ 1.61	$ 8.73	$ 2.35
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING
Weighted average common shares outstanding, basic (in shares)	130.1	161.6	179.1
Weighted average common shares outstanding, diluted (in shares)	131.0	162.6	180.4
COMPREHENSIVE INCOME
Net income	$ 211.5	$ 1,419.7	$ 424.3
Other comprehensive income (loss), net of tax
Currency translation adjustments	4.2	43.7	(39.6)
Amortization of pension and other postretirement plan prior service credits	(1.7)	(1.7)	(1.7)
Unrealized (loss) gain on cash flow hedges	(5.8)	(7.5)	12.5
Other comprehensive (loss) income	(3.3)	34.5	(28.8)
Comprehensive income	$ 208.2	$ 1,454.2	$ 395.5