Segment and Geographical Data (Schedule of Supplemental Product Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Revenue from External Customer [Line Items]
Net sales	$ 2,171.7	$ 2,087.3	$ 1,949.7
Razors and blades
Revenue from External Customer [Line Items]
Net sales	1,108.8	1,084.6	1,023.3
Tampons, pads and liners
Revenue from External Customer [Line Items]
Net sales	290.7	286.1	298.6
Sun care products
Revenue from External Customer [Line Items]
Net sales	401.8	333.6	283.3
Infant care and other products
Revenue from External Customer [Line Items]
Net sales	0.0	0.0	26.8
Shaving gels and creams
Revenue from External Customer [Line Items]
Net sales	133.7	131.3	139.0
Skin care products
Revenue from External Customer [Line Items]
Net sales	$ 236.7	$ 251.7	$ 178.7