Goodwill and Intangible Assets (Schedule of Goodwill) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Goodwill [Line Items]
Goodwill, gross	$ 1,702.4	$ 1,693.2	$ 1,533.8
Goodwill, accumulated impairment loss	(371.0)	(371.0)	(371.0)
Goodwill [Roll Forward]
Net balance at October 1, 2022	1,322.2	1,162.8
Cumulative translation adjustment	9.2	(21.8)
Net balance at September 30, 2023	1,331.4	1,322.2
Goodwill billie acquisition		181.2
Wet Shave
Goodwill [Line Items]
Goodwill, gross	1,140.5	1,133.5	967.5
Goodwill, accumulated impairment loss	(369.0)	(369.0)	(369.0)
Goodwill [Roll Forward]
Net balance at October 1, 2022	764.5	598.5
Cumulative translation adjustment	7.0	(15.2)
Net balance at September 30, 2023	771.5	764.5
Goodwill billie acquisition		181.2
Sun and Skin Care
Goodwill [Line Items]
Goodwill, gross	355.9	354.5	357.6
Goodwill, accumulated impairment loss	(2.0)	(2.0)	(2.0)
Goodwill [Roll Forward]
Net balance at October 1, 2022	352.5	355.6
Cumulative translation adjustment	1.4	(3.1)
Net balance at September 30, 2023	353.9	352.5
Goodwill billie acquisition		0.0
Feminine Care
Goodwill [Line Items]
Goodwill, gross	206.0	205.2	208.7
Goodwill, accumulated impairment loss	0.0	0.0	$ 0.0
Goodwill [Roll Forward]
Net balance at October 1, 2022	205.2	208.7
Cumulative translation adjustment	0.8	(3.5)
Net balance at September 30, 2023	$ 206.0	205.2
Goodwill billie acquisition		$ 0.0