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Commitments and Contingencies - Guarantees and Contracts (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2019
Mar. 31, 2015
Contracts with U.S. government agencies or other U.S. government contractors            
Concentration Risk [Line Items]            
Concentration risk, percentage 96.00% 96.00% 97.00% 96.00%    
Unfavorable Regulatory Action            
Loss Contingencies [Line Items]            
Liability for reductions and/or penalties from U.S Government audits $ 217.6   $ 217.6   $ 195.3  
Financial Standby Letter of Credit            
Concentration Risk [Line Items]            
Guarantor obligations, carrying value 10.6   10.6   9.5  
Guarantor obligations, reduction to available borrowings     0.9   1.0  
Guarantor obligations, facility           $ 15.0
Guarantor obligations, available amount $ 5.3   $ 5.3   $ 6.5