Segment and Geographical Data (Schedule of Segment Disclosures) (Details) - USD ($)		12 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Net sales		$ 2,171,700,000	$ 2,087,300,000	$ 1,949,700,000
Operating income		181,200,000	238,800,000	176,000,000.0
Restructuring and related costs		16,200,000	30,100,000	38,100,000
Acquisition integration costs	[1]	9,900,000	8,400,000	39,800,000
SKU rationalization charges	[2]	(22,500,000)	0
Sun Care reformulation costs	[3]	4,600,000	1,100,000	0
Legal settlement	[4]	7,500,000	0
Pension settlement loss	[5]	1,800,000	0
VAT settlement costs	[6]	(3,400,000)	0
Cost of early retirement of long-term debt		0	(26,100,000)	(26,200,000)
Covid-19 pandemic expenses	[7]	0	0	4,300,000
Feminine and Infant Care evaluation costs	[8]	0	0	300,000
Gain on sale of Infant and Pet Care business		0	0	4,100,000
Amortization of intangibles		(29,400,000)	(22,000,000.0)	(17,300,000)
Interest and other expense, net		(56,400,000)	(66,700,000)	(66,600,000)
Earnings (loss) before income taxes		123,000,000.0	146,000,000.0	87,300,000
Depreciation and amortization		89,900,000	87,100,000	88,800,000
Total assets		3,713,100,000	3,674,600,000
Intangible assets, net (including goodwill)		2,318,800,000	2,069,200,000
Wet Shave
Segment Reporting Information [Line Items]
Net sales		1,242,500,000	1,215,900,000	1,162,300,000
Operating income		174,000,000.0	221,000,000.0	206,200,000
Restructuring and related costs			5,300,000	11,400,000
Depreciation and amortization		36,400,000	39,900,000	44,800,000
Total assets		751,400,000	713,700,000
Capital expenditures		36,100,000	36,100,000	34,800,000
Sun and Skin Care
Segment Reporting Information [Line Items]
Net sales		638,500,000	585,300,000	462,000,000.0
Operating income		108,500,000	98,700,000	69,100,000
Restructuring and related costs			300,000	1,100,000
Depreciation and amortization		15,400,000	15,600,000	13,800,000
Total assets		276,800,000	256,300,000
Capital expenditures		12,400,000	12,200,000	7,100,000
Feminine Care
Segment Reporting Information [Line Items]
Net sales		290,700,000	286,100,000	298,600,000
Operating income		31,200,000	37,200,000	52,300,000
Restructuring and related costs			300,000	400,000
Depreciation and amortization		8,700,000	9,600,000	11,900,000
Total assets		159,100,000	137,100,000
Capital expenditures		7,900,000	8,500,000	5,000,000.0
All Other
Segment Reporting Information [Line Items]
Net sales		0	0	26,800,000
Operating income		0	0	3,100,000
Depreciation and amortization		0	0	1,000,000.0
Capital expenditures		0	0	800,000
Operating segments
Segment Reporting Information [Line Items]
Operating income		313,700,000	356,900,000	330,700,000
Depreciation and amortization		60,500,000	65,100,000	71,500,000
Total assets		1,187,300,000	1,107,100,000
Capital expenditures		56,400,000	56,800,000	47,700,000
Corporate
Segment Reporting Information [Line Items]
General corporate and other expenses		(54,000,000.0)	(56,500,000)	(54,900,000)
Restructuring and related costs			24,200,000	25,200,000
Depreciation and amortization		29,400,000	22,000,000.0	17,300,000
Total assets	[9]	207,000,000.0	498,300,000
Cost of products sold
Segment Reporting Information [Line Items]
Acquisition integration costs		800,000	1,300,000	600,000
Sun Care reformulation costs		3,500,000	1,100,000
Continuing operations
Segment Reporting Information [Line Items]
Depreciation and amortization		89,900,000	87,100,000	88,800,000
Selling, general and administrative expense
Segment Reporting Information [Line Items]
Acquisition integration costs		9,100,000	$ 7,100,000	$ 39,200,000
R&D
Segment Reporting Information [Line Items]
Sun Care reformulation costs		$ 1,100,000

[1] Includes SG&A of $9.1, $7.1, and $39.2 for fiscal 2022, 2021, and 2020, respectively, related to integration expenses associated with acquisitions and Cost of products sold of $0.8, $1.3, and $0.6 related to the valuation of acquired inventory for fiscal 2022, 2021, and 2020 respectively.

[2] Includes Cost of products sold of $22.5 for fiscal 2022 for the write-off of certain Wet Ones SKUs and related contract termination charges. Wet Ones products are included within the Sun and Skin Care segment.

[3] Includes pre-tax R&D of $1.1 for fiscal 2022 and pre-tax COGS of $3.5 and $1.1 for fiscal 2022 and fiscal 2021, respectively, related to the reformulation, recall, and destruction of certain Sun Care products.

[4] Includes pre-tax SG&A of $7.5 for fiscal 2022 for a favorable legal settlement.

[5] Includes pre-tax other (income) expense of $1.8for fiscal 2022 for a pension settlement expenses.

[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.

[7] Includes pre-tax Cost of products sold of $4.3 for fiscal 2020, which included incremental costs incurred by the Company related to higher benefit and emergency payments, supplies and freight.

[8] Includes pre-tax SG&A of $0.3 for fiscal 2020 associated with consulting costs incurred in connection with the evaluation of our Feminine Care and Infant Care segments.

[9] Corporate assets include all cash and cash equivalents, financial instruments and deferred tax assets that are managed outside of operating segments.