Goodwill and Intangible Assets (Schedule of Amortizable Intangible Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023	Jul. 01, 2025
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross carrying amount	$ 692.8	$ 692.0
Amortizable intangible assets, accumulated amortization	(373.1)	(341.2)
Amortizable intangible assets, net	319.7	350.8
Amortization of intangibles	31.1	31.1	$ 30.8
Amortizable intangible assets, amortization expense, next 12 months	30.8
Amortizable intangible assets, amortization expense, year two	30.6
Amortizable intangible assets, amortization expense, year 3	30.5
Amortizable intangible assets, amortization expense, year 4	30.4
Amortizable intangible assets, amortization expense, year 5	30.4
Amortizable intangible assets, amortization expense, thereafter	167.0
Indefinite-lived intangible assets	601.6	597.7
Intangible Assets, Gross (Excluding Goodwill)	1,294.4	1,289.7
Other intangible assets, net	$ 921.3	948.5
Bulldog
Finite-Lived Intangible Assets [Line Items]
Excess of FV over Carrying Value				9.00%
Banana Boat
Finite-Lived Intangible Assets [Line Items]
Excess of FV over Carrying Value				4.00%
Wet Shave
Finite-Lived Intangible Assets [Line Items]
Excess of FV over Carrying Value	7.00%			15.00%
Trade names and brands
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross carrying amount	$ 340.0	339.8
Amortizable intangible assets, accumulated amortization	(119.9)	(104.0)
Amortizable intangible assets, net	220.1	235.8
Technology and patents
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross carrying amount	80.2	79.7
Amortizable intangible assets, accumulated amortization	(78.3)	(77.3)
Amortizable intangible assets, net	1.9	2.4
Customer related and other
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross carrying amount	272.6	272.5
Amortizable intangible assets, accumulated amortization	(174.9)	(159.9)
Amortizable intangible assets, net	$ 97.7	$ 112.6