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Revenue Recognition - Schedule of Changes Within Defense Segment Due to Contract Adjustments (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Disaggregation Of Revenue [Abstract]
Net sales	$ (3.1)	$ 15.6	$ 12.7	$ 24.8
Operating income	(3.6)	10.6	11.0	14.6
Net income	$ (2.8)	$ 7.6	$ 8.4	$ 10.4
Diluted earnings per share	$ (0.04)	$ 0.11	$ 0.12	$ 0.15