Segment and Geographical Data (Schedule of Supplemental Product Information) (Details) - USD ($) $ in Millions	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
Revenue from External Customer [Line Items]
Net sales	$ 534.1	$ 650.0	$ 598.4	$ 469.1	$ 536.9	$ 623.8	$ 547.7	$ 463.3	$ 2,251.6	$ 2,171.7	$ 2,087.3
Razors and blades
Revenue from External Customer [Line Items]
Net sales									1,103.6	1,108.8	1,084.6
Tampons, pads and liners
Revenue from External Customer [Line Items]
Net sales									315.2	290.7	286.1
Sun care products
Revenue from External Customer [Line Items]
Net sales									450.7	401.8	333.6
Infant care and other products
Revenue from External Customer [Line Items]
Net sales									172.5	158.7	148.9
Shaving gels and creams
Revenue from External Customer [Line Items]
Net sales									127.3	133.7	131.3
Skin care products
Revenue from External Customer [Line Items]
Net sales									$ 82.3	$ 78.0	$ 102.8