Segment and Geographical Data (Schedule of Segment Disclosures) (Details) - USD ($)	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Net sales	$ 2,223,500,000	$ 2,253,700,000	$ 2,251,600,000
Cost of products sold for segments	1,291,800,000	1,281,400,000	1,313,300,000
Operating income	96,600,000	199,300,000	227,000,000.0
Restructuring and related costs	53,100,000	36,000,000.0	17,100,000
Acquisition integration costs	500,000	6,100,000	7,500,000
Sun Care reformulation costs EPC	3,500,000	4,400,000	1,900,000
Legal settlement		(3,900,000)	6,300,000
Pension settlement expense			7,900,000
Amortization of Intangible Assets	(31,100,000)	(31,100,000)	(30,800,000)
Interest Expense and Other Nonoperating (Income) Expense, Net	76,200,000	75,300,000	71,400,000
Earnings (loss) before income taxes	23,600,000	120,900,000	147,700,000
Depreciation, Depletion and Amortization	88,800,000	88,000,000.0	91,400,000
Total assets	3,756,300,000	3,730,900,000
Segment, Expenditure, Addition to Long-Lived Assets	77,000,000.0	56,500,000	49,500,000
Gain (Loss) on Investments	(900,000)	3,100,000
Commercial realignment	(2,900,000)
Vendor bankruptcy	2,100,000
Goodwill, Impairment Loss	51,100,000
Other project and related costs	(7,000,000.0)	(5,300,000)	(400,000)
Wet Ones manufacturing plant fire		(12,200,000)
Cost of products sold	1,298,600,000	1,298,000,000	1,310,800,000
Revenue from External Customer [Line Items]
Goodwill, Impairment Loss	51,100,000
Wet Shave
Segment Reporting Information [Line Items]
Net sales	1,218,900,000	1,229,300,000	1,230,900,000
Cost of products sold for segments			724,600,000
Operating income	190,300,000	203,900,000	158,300,000
Depreciation, Depletion and Amortization	39,200,000	35,900,000	37,100,000
Segment, Expenditure, Addition to Long-Lived Assets	45,900,000	33,300,000	31,200,000
Cost of products sold	682,800,000	692,000,000.0
Other operating expenses	345,800,000	333,400,000	348,000,000.0
Sun and Skin Care
Segment Reporting Information [Line Items]
Net sales	743,100,000	740,800,000	705,500,000
Cost of products sold for segments			383,200,000
Operating income	98,400,000	131,300,000	137,400,000
Depreciation, Depletion and Amortization	8,400,000	14,100,000	15,100,000
Segment, Expenditure, Addition to Long-Lived Assets	22,200,000	16,000,000.0	12,200,000
Cost of products sold	420,600,000	400,000,000.0
Other operating expenses	224,100,000	209,500,000	184,900,000
Feminine Care
Segment Reporting Information [Line Items]
Net sales	261,500,000	283,600,000	315,200,000
Cost of products sold for segments			205,500,000
Operating income	15,600,000	28,800,000	49,700,000
Depreciation, Depletion and Amortization	10,100,000	6,800,000	8,400,000
Segment, Expenditure, Addition to Long-Lived Assets	8,900,000	7,200,000	6,100,000
Cost of products sold	188,400,000	189,400,000
Other operating expenses	57,500,000	65,400,000	60,000,000.0
Corporate
Segment Reporting Information [Line Items]
General corporate and other expenses	(54,100,000)	(65,700,000)	(68,700,000)
Depreciation, Depletion and Amortization	31,100,000	31,200,000	30,800,000
segment profit
Segment Reporting Information [Line Items]
Operating income	304,300,000	364,000,000.0	345,400,000
Other operating expenses	627,400,000	608,300,000	592,900,000
Corporate Segment and Other Operating Segment [Member]
Segment Reporting Information [Line Items]
Operating income	304,300,000	364,000,000.0	345,400,000
Selling, general and administrative expense
Segment Reporting Information [Line Items]
Acquisition integration costs	0	3,300,000	0
Restructuring Charges, Including Amounts in Selling, General and Administrative Expenses	3,500,000	0	$ 200,000
Other project and related costs	$ 9,300,000	$ 5,300,000