Segment and Geographical Data (Schedule of Supplemental Product Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Revenue from External Customer [Line Items]
Net sales	$ 2,223.5	$ 2,253.7	$ 2,251.6
Cost of products sold	1,298.6	1,298.0	1,310.8
Selling, general and administrative expense	425.0	430.1	409.6
SKU rationalization charges			(1.7)
Selling, general and administrative expense
Revenue from External Customer [Line Items]
Restructuring Charges, Including Amounts in Selling, General and Administrative Expenses	3.5	0.0	0.2
Razors and blades
Revenue from External Customer [Line Items]
Net sales	1,104.7	1,111.0	1,103.6
Tampons, pads and liners
Revenue from External Customer [Line Items]
Net sales	261.5	283.6	315.2
Sun care products
Revenue from External Customer [Line Items]
Net sales	458.9	483.6	450.7
Infant care and other products
Revenue from External Customer [Line Items]
Net sales	200.6	182.9	172.5
Shaving gels and creams
Revenue from External Customer [Line Items]
Net sales	114.2	118.3	127.3
Skin care products
Revenue from External Customer [Line Items]
Net sales	$ 83.6	$ 74.3	$ 82.3