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Commitments and Contingencies (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
U.S. Department of Justice
Loss Contingencies [Line Items]
Increase in reserve	$ 226.0
Estimate of possible loss	350.0	$ 350.0
U.S. Department of Justice | Minimum
Loss Contingencies [Line Items]
Estimate of possible loss				$ 350.0
U.S. Department of Justice | Maximum
Loss Contingencies [Line Items]
Estimate of possible loss				$ 378.0
Contracts with U.S. government agencies or other U.S. government contractors | Revenue Benchmark | Total U.S. government
Concentration Risk [Line Items]
Concentration risk, percentage		97.00%	97.00%	97.00%
Unfavorable Regulatory Action
Loss Contingencies [Line Items]
Liability for reductions and/or penalties from U.S Government audits	326.7	$ 326.7	$ 290.4
Financial Standby Letter of Credit
Concentration Risk [Line Items]
Guarantor obligations, carrying value	6.1	6.1	8.4
Guarantor obligations, reduction to available borrowings		1.3	1.0
Guarantor obligations, facility	7.5	7.5	20.0
Guarantor obligations, available amount	$ 2.7	$ 2.7	$ 12.6

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