Segment and Geographical Data (Schedule of Supplemental Product Information) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Revenue from External Customer [Line Items]
Net sales	$ 570.1	$ 560.4	$ 1,512.4	$ 1,492.1
Cost of products sold	327.6	310.3	892.0	832.7
Selling, general and administrative expense	108.3	100.7	321.7	303.1
Selling, general and administrative expense
Revenue from External Customer [Line Items]
Restructuring Charges, Including Amounts in Selling, General and Administrative Expenses			(25.7)
Razors and blades
Revenue from External Customer [Line Items]
Net sales	282.7	287.8	812.0	814.2
Sun care products
Revenue from External Customer [Line Items]
Net sales	180.7	175.1	392.3	386.7
Shaving gels and creams
Revenue from External Customer [Line Items]
Net sales	30.1	29.2	86.2	82.8
Grooming products
Revenue from External Customer [Line Items]
Net sales	53.7	46.5	163.5	148.3
Wipes and other skin care products
Revenue from External Customer [Line Items]
Net sales	$ 22.9	$ 21.8	$ 58.4	$ 60.1

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