Segment and Geographical Data (Schedule of Segment Disclosures) (Details) - USD ($)		3 Months Ended								12 Months Ended
		Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Net sales		$ 534,100,000	$ 650,000,000.0	$ 598,400,000	$ 469,100,000	$ 536,900,000	$ 623,800,000	$ 547,700,000	$ 463,300,000	$ 2,251,600,000	$ 2,171,700,000	$ 2,087,300,000
Operating income										227,000,000.0	182,300,000	239,900,000
Restructuring and related costs										17,100,000	16,200,000	30,100,000
Acquisition integration costs	[1]									7,500,000	9,900,000	8,400,000
SKU rationalization charges										1,700,000	(22,500,000)	0
Sun Care reformulation costs										1,900,000	4,600,000	1,100,000
Legal settlement										6,300,000	7,500,000	0	[2]
Pension settlement loss	[3]											0
VAT settlement costs										0	(3,400,000)	0
Pension settlement expense										7,900,000	1,800,000
Cost of early retirement of long-term debt										0	0	(26,100,000)
Other Cost and Expense, Operating										400,000
Amortization of Intangible Assets										(30,800,000)	(29,400,000)	(22,000,000.0)
Interest and other expense, net										(71,400,000)	(56,400,000)	(66,700,000)
Earnings (loss) before income taxes										147,700,000	124,100,000	147,100,000
Depreciation, Depletion and Amortization										91,400,000	89,900,000	87,100,000
Depreciation and amortization operating segments										60,600,000	60,500,000	65,100,000
Total assets		3,740,700,000				3,713,100,000				3,740,700,000	3,713,100,000
Intangible assets, net (including goodwill)		2,305,200,000				2,318,800,000				2,305,200,000	2,318,800,000
Wet Shave
Segment Reporting Information [Line Items]
Net sales										1,230,900,000	1,242,500,000	1,215,900,000
Operating income										158,300,000	174,500,000	221,500,000
Restructuring and related costs												5,300,000
Depreciation, Depletion and Amortization										37,100,000	36,400,000	39,900,000
Total assets		724,100,000				751,400,000				724,100,000	751,400,000
Capital expenditures										31,200,000	36,100,000	36,100,000
Sun and Skin Care
Segment Reporting Information [Line Items]
Net sales										705,500,000	638,500,000	585,300,000
Operating income										137,400,000	108,800,000	99,000,000.0
Restructuring and related costs												300,000
Depreciation, Depletion and Amortization										15,100,000	15,400,000	15,600,000
Total assets		316,100,000				276,800,000				316,100,000	276,800,000
Capital expenditures										12,200,000	12,400,000	12,200,000
Feminine Care
Segment Reporting Information [Line Items]
Net sales										315,200,000	290,700,000	286,100,000
Operating income										49,700,000	31,500,000	37,500,000
Restructuring and related costs												300,000
Depreciation, Depletion and Amortization										8,400,000	8,700,000	9,600,000
Total assets		163,200,000				159,100,000				163,200,000	159,100,000
Capital expenditures										6,100,000	7,900,000	8,500,000
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Operating income										345,400,000	314,800,000	358,000,000.0
Total assets		1,203,400,000				1,187,300,000				1,203,400,000	1,187,300,000
Capital expenditures										49,500,000	56,400,000	56,800,000
Corporate
Segment Reporting Information [Line Items]
General corporate and other expenses										(68,700,000)	(54,000,000.0)	(56,500,000)
Restructuring and related costs												24,200,000
Depreciation, Depletion and Amortization										30,800,000	29,400,000	$ 22,000,000.0
Total assets		$ 232,100,000				$ 207,000,000.0				232,100,000	207,000,000.0
Cost of products sold
Segment Reporting Information [Line Items]
Acquisition integration costs										0	800,000
Selling, general and administrative expense
Segment Reporting Information [Line Items]
Acquisition integration costs										$ 7,500,000	$ 9,100,000

[1] Includes SG&A of $7.5, $9.1, and $7.1 for fiscal 2023, 2022, and 2021, respectively, related to integration expenses associated with acquisitions and Cost of products sold of nil, $0.8, and $1.3 related to the valuation of acquired inventory for fiscal 2023, 2022, and 2021, respectively.

[2] Includes pre-tax SG&A of $6.3 and $7.5 for fiscal 2023 and 2022, respectively, related to the resolution of legal matters. See Note 17 of the Notes to Consolidated Financial Statements. (6)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 $7.9 and $1.8 for fiscal 2023 and 2022, respectively, related to pension settlement expenses. (8)Includes pre-tax SG&A of $0.4 for fiscal 2023 related to the write off of assets associated with a prior year divestiture.