Segment Data (Schedule of Sales by Geographical Area) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Revenue from External Customer [Line Items]
Net sales	$ 519.5	$ 516.6	$ 942.3	$ 931.7
United States
Revenue from External Customer [Line Items]
Net sales	266.2	280.8	458.1	468.3
International
Revenue from External Customer [Line Items]
Net sales	$ 253.3	$ 235.8	$ 484.2	$ 463.4

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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+ Details