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Contingencies and Concentrations - Schedule of Significant Portion of Revenues from the Department of Defense (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Sep. 30, 2021
Disaggregation Of Revenue [Line Items]
Net sales	$ 1,791.7	$ 9,657.9	$ 8,282.0	$ 7,737.3
DoD
Disaggregation Of Revenue [Line Items]
Net sales	521.2	1,664.8	1,995.8	2,395.1
Foreign Military
Disaggregation Of Revenue [Line Items]
Net sales	0.5	156.6	76.2	139.2
Total DoD Sales
Disaggregation Of Revenue [Line Items]
Net sales	$ 521.7	$ 1,821.4	$ 2,072.0	$ 2,534.3

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