Segment and Geographical Data (Schedule of Supplemental Product Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Revenue from External Customer [Line Items]
Net sales	$ 2,253.7	$ 2,251.6	$ 2,171.7
Cost of products sold	1,298.0	1,310.8	1,291.2
SKU rationalization charges	0.0	(1.7)	22.5
Manufacturing Plant Fire	12.2
Selling, general and administrative expense
Revenue from External Customer [Line Items]
Restructuring Charges, Including Amounts in Selling, General and Administrative Expenses	0.1	0.3	0.8
Cost of products sold
Revenue from External Customer [Line Items]
Restructuring Charges, Including Amounts in Selling, General and Administrative Expenses		0.2	0.1
Billie
Revenue from External Customer [Line Items]
Cost of products sold	3.3	0.0	0.8
Selling, general and administrative expense	2.8	7.5	9.1
Razors and blades
Revenue from External Customer [Line Items]
Net sales	1,111.0	1,103.6	1,108.8
Tampons, pads and liners
Revenue from External Customer [Line Items]
Net sales	283.6	315.2	290.7
Sun care products
Revenue from External Customer [Line Items]
Net sales	483.6	450.7	401.8
Infant care and other products
Revenue from External Customer [Line Items]
Net sales	182.9	172.5	158.7
Shaving gels and creams
Revenue from External Customer [Line Items]
Net sales	118.3	127.3	133.7
Skin care products
Revenue from External Customer [Line Items]
Net sales	$ 74.3	$ 82.3	$ 78.0