Segment Data (Schedule of Supplemental Product Information) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue from External Customer [Line Items]
Net sales	$ 573.7	$ 483.9	$ 1,544.1	$ 1,460.9
Razors and blades
Revenue from External Customer [Line Items]
Net sales	271.9	244.9	780.6	735.3
Tampons, pads and liners
Revenue from External Customer [Line Items]
Net sales	73.6	69.0	209.7	229.1
Sun care products
Revenue from External Customer [Line Items]
Net sales	143.9	94.0	275.7	246.3
Grooming products
Revenue from External Customer [Line Items]
Net sales	32.4	15.6	108.6	55.3
Wipes and other skin care products
Revenue from External Customer [Line Items]
Net sales	18.9	27.3	73.4	67.9
Shaving gels and creams
Revenue from External Customer [Line Items]
Net sales	33.0	33.1	96.1	100.2
Infant care and other
Revenue from External Customer [Line Items]
Net sales	$ 0.0	$ 0.0	$ 0.0	$ 26.8