Segment Data (Schedule of Supplemental Product Information) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Revenue from External Customer [Line Items]
Net sales	$ 599.4	$ 598.4	$ 1,088.3	$ 1,067.5
Razors and blades
Revenue from External Customer [Line Items]
Net sales	264.8	278.4	535.3	525.4
Tampons, pads and liners
Revenue from External Customer [Line Items]
Net sales	70.5	80.1	142.3	161.0
Sun care products
Revenue from External Customer [Line Items]
Net sales	175.0	153.8	226.0	201.6
Grooming products
Revenue from External Customer [Line Items]
Net sales	45.0	38.0	91.8	85.3
Wipes and other skin care products
Revenue from External Customer [Line Items]
Net sales	15.8	17.9	33.4	35.7
Shaving gels and creams
Revenue from External Customer [Line Items]
Net sales	$ 28.3	$ 30.2	$ 59.5	$ 58.5