Consolidated Statements of Earnings and Comprehensive (Loss) Income - USD ($) shares in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Income Statement [Abstract]
Net sales	$ 2,223,500,000	$ 2,253,700,000	$ 2,251,600,000
Cost of products sold	1,298,600,000	1,298,000,000	1,310,800,000
Gross profit	924,900,000	955,700,000	940,800,000
Selling, general and administrative expense	425,000,000.0	430,100,000	409,600,000
Advertising and sales promotion expense	246,700,000	232,000,000.0	229,100,000
Research and development expense	57,600,000	58,400,000	58,500,000
Restructuring charges	47,900,000	35,900,000	16,600,000
Goodwill, Impairment Loss	51,100,000
Operating income	96,600,000	199,300,000	227,000,000.0
Interest expense associated with debt	73,200,000	76,500,000	78,500,000
Other (income) expense, net	(200,000)	1,900,000	800,000
Earnings before income taxes	23,600,000	120,900,000	147,700,000
Income tax (benefit) provision	(1,800,000)	22,300,000	33,000,000.0
Net earnings	$ 25,400,000	$ 98,600,000	$ 114,700,000
Basic	$ 0.53	$ 1.98	$ 2.24
Diluted	$ 0.53	$ 1.97	$ 2.21
Condensed Consolidated Statements of Comprehensive Income
Net earnings	$ 25,400,000	$ 98,600,000	$ 114,700,000
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	27,000,000.0	18,600,000	44,300,000
Pension and postretirement activity, net of tax	17,200,000	1,200,000	6,600,000
Deferred gain (loss) on hedging activity, net of tax	800,000	(4,600,000)	(4,800,000)
Total other comprehensive income (loss), net of tax	45,000,000.0	15,200,000	46,100,000
Total comprehensive income	$ 70,400,000	$ 113,800,000	$ 160,800,000
Basic weighted-average shares outstanding (in shares)	47.5	49.7	51.2
Diluted weighted-average shares outstanding (in shares)	47.6	50.1	51.8