Segment Data Segment Data (Schedule of Sales by Geographical Area) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Revenue from External Customer [Line Items]
Net sales	$ 463.3	$ 451.1
United States
Revenue from External Customer [Line Items]
Net sales	262.5	250.8
International
Revenue from External Customer [Line Items]
Net sales	$ 200.8	$ 200.3