Segment Data (Schedule of Supplemental Product Information) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenue from External Customer [Line Items]
Net sales	$ 454.0	$ 457.1
Razors and blades
Revenue from External Customer [Line Items]
Net sales	244.3	255.3
Tampons, pads and liners
Revenue from External Customer [Line Items]
Net sales	75.1	74.7
Skin care products
Revenue from External Customer [Line Items]
Net sales	37.9	33.5
Sun care products
Revenue from External Customer [Line Items]
Net sales	37.2	33.2
Shaving gels and creams
Revenue from External Customer [Line Items]
Net sales	32.7	32.4
Infant care and other
Revenue from External Customer [Line Items]
Net sales	$ 26.8	$ 28.0