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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, 2018
Dec. 31, 2017
Dec. 31, 2018
Mar. 31, 2018
Mar. 31, 2015
Contracts with U.S. government agencies or other U.S. government contractors          
Concentration Risk [Line Items]          
Concentration risk, percentage 96.00% 97.00% 96.00%    
Unfavorable Regulatory Action          
Loss Contingencies [Line Items]          
Liability for reductions and/or penalties from U.S Government audits $ 185.5   $ 185.5 $ 168.6  
Financial Standby Letter of Credit          
Concentration Risk [Line Items]          
Guarantor obligations, carrying value 9.6   9.6 6.3  
Guarantor obligations, reduction to available borrowings     1.0 1.4  
Guarantor obligations, facility         $ 15.0
Guarantor obligations, available amount $ 6.4   $ 6.4 $ 10.1