Segment and Geographical Data (Schedule of Segment Disclosures) (Details) - USD ($)		12 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Net sales		$ 2,253,700,000	$ 2,251,600,000	$ 2,171,700,000
Operating income		199,300,000	227,000,000.0	182,300,000
Restructuring and related costs		36,000,000.0	17,100,000	16,200,000
Acquisition integration costs	[1]	6,100,000	7,500,000	9,900,000
SKU rationalization charges		0	1,700,000	(22,500,000)
Sun Care reformulation costs		4,400,000	1,900,000	4,600,000
Legal settlement		(3,900,000)	6,300,000	7,500,000	[2]
Pension settlement loss	[3]			1,800,000
VAT settlement costs		0	0	(3,400,000)
Pension settlement expense		0	7,900,000
Other Cost and Expense, Operating		5,300,000	400,000
Amortization of Intangible Assets		(31,100,000)	(30,800,000)	(29,400,000)
Interest and other expense, net		(75,300,000)	(71,400,000)	(56,400,000)
Earnings (loss) before income taxes		120,900,000	147,700,000	124,100,000
Depreciation, Depletion and Amortization		88,000,000.0	91,400,000	89,900,000
Depreciation and amortization operating segments		56,800,000	60,600,000	60,500,000
Total assets		3,730,900,000	3,740,700,000
Intangible assets, net (including goodwill)		2,287,100,000	2,305,200,000
Gain (Loss) on Investments		(3,100,000)
Manufacturing Plant Fire		(12,200,000)
Revenue from External Customer [Line Items]
Sun Care reformulation costs		4,400,000	3,300,000	0
Wet Shave
Segment Reporting Information [Line Items]
Net sales		1,229,300,000	1,230,900,000	1,242,500,000
Operating income		203,900,000	158,300,000	174,500,000
Depreciation, Depletion and Amortization		35,900,000	37,100,000	36,400,000
Total assets		724,500,000	724,100,000
Segment, Expenditure, Addition to Long-Lived Assets		33,300,000	31,200,000	36,100,000
Sun and Skin Care
Segment Reporting Information [Line Items]
Net sales		740,800,000	705,500,000	638,500,000
Operating income		131,300,000	137,400,000	108,800,000
Depreciation, Depletion and Amortization		14,100,000	15,100,000	15,400,000
Total assets		314,400,000	316,100,000
Segment, Expenditure, Addition to Long-Lived Assets		16,000,000.0	12,200,000	12,400,000
Feminine Care
Segment Reporting Information [Line Items]
Net sales		283,600,000	315,200,000	290,700,000
Operating income		28,800,000	49,700,000	31,500,000
Depreciation, Depletion and Amortization		6,800,000	8,400,000	8,700,000
Total assets		176,200,000	163,200,000
Segment, Expenditure, Addition to Long-Lived Assets		7,200,000	6,100,000	7,900,000
Corporate Segment and Other Operating Segment [Member]
Segment Reporting Information [Line Items]
Operating income		364,000,000.0	345,400,000	314,800,000
Total assets		1,215,100,000	1,203,400,000
Segment, Expenditure, Addition to Long-Lived Assets		56,500,000	49,500,000	56,400,000
Corporate
Segment Reporting Information [Line Items]
General corporate and other expenses		(65,700,000)	(68,700,000)	(54,000,000.0)
Depreciation, Depletion and Amortization		31,200,000	30,800,000	29,400,000
Total assets		228,700,000	232,100,000
Cost of products sold
Segment Reporting Information [Line Items]
Restructuring Charges, Including Amounts in Selling, General and Administrative Expenses			200,000	100,000
Selling, general and administrative expense
Segment Reporting Information [Line Items]
Restructuring Charges, Including Amounts in Selling, General and Administrative Expenses		$ 100,000	$ 300,000	$ 800,000

[1] Includes COGS of $3.3, nil, and $0.8 for fiscal 2024, 2023, and 2022, respectively and SG&A of $2.8, $7.5, and $9.1 for fiscal 2024, 2023, and 2022, respectively, related to costs associated with the acquisition of Billie, Inc. on November 29, 2021.

[2] Includes pre-tax SG&A of $3.9 for fiscal 2024 for the settlement of certain legal matters. Includes pre-tax income in SG&A of $$6.3, net of other costs of $0.8, in fiscal 2023 related to the favorable resolution of legal matters. (7)Includes pre-tax loss of $3.1 for fiscal 2024, on an equity method investment and a related note receivable as a result of a new contractual agreement. (8)Includes pre-tax SG&A of $3.4 for the fiscal 2022 related to the estimated settlement of prior years’ value-added tax audits in Germany.

[3] Includes pre-tax Other expense (income), net of nil, $7.9 and $1.8 for fiscal 2023 and 2022, respectively related to related to the settlement of the Canada Plan. (10)Includes pre-tax SG&A of $5.3 for fiscal 2024 related to certain corporate project costs. Includes pre-tax SG&A of $0.4 for fiscal 2023 related to the write off of assets associated with a prior year divestiture.