Segment Data Segment Data (Schedule of Sales by Geographical Area) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Revenue from External Customer [Line Items]
Net sales	$ 599.4	$ 598.4	$ 1,088.3	$ 1,067.5
United States
Revenue from External Customer [Line Items]
Net sales	355.1	367.9	609.3	639.7
International
Revenue from External Customer [Line Items]
Net sales	$ 244.3	$ 230.5	$ 479.0	$ 427.8