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Revenue Recognition - Schedule of Impact Due to Contract Adjustments (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Disaggregation Of Revenue [Abstract]
Net sales	$ (0.1)	$ 16.1
Operating income	(7.7)	14.8
Net income	$ (5.9)	$ 11.3
Diluted earnings per share	$ (0.09)	$ 0.16