Goodwill and Intangible Assets (Schedule of Goodwill) (Details) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2024	Sep. 30, 2023
Goodwill [Line Items]
Goodwill, Gross	$ 1,704.9	$ 1,702.4
Accumulated goodwill impairment loss	371.0	371.0
Goodwill [Roll Forward]
Beginning balance	1,331.4
Cumulative translation adjustment	(2.5)
Ending balance	1,333.9
Wet Shave
Goodwill [Line Items]
Goodwill, Gross	1,142.4	1,140.5
Accumulated goodwill impairment loss	369.0	369.0
Goodwill [Roll Forward]
Beginning balance	771.5
Cumulative translation adjustment	(1.9)
Ending balance	773.4
Sun and Skin Care
Goodwill [Line Items]
Goodwill, Gross	356.4	355.9
Accumulated goodwill impairment loss	2.0	2.0
Goodwill [Roll Forward]
Beginning balance	353.9
Cumulative translation adjustment	(0.5)
Ending balance	354.4
Feminine Care
Goodwill [Line Items]
Goodwill, Gross	206.1	206.0
Accumulated goodwill impairment loss	0.0	$ 0.0
Goodwill [Roll Forward]
Beginning balance	206.0
Cumulative translation adjustment	(0.1)
Ending balance	$ 206.1