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Balance Sheet Accounts (Tables)
 3 Months Ended
Mar. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Fair Value of Financial Instruments
 Fair value measurement as of March 31, 2023
 TotalQuoted Prices in
Active Markets
for Identical
Assets
(Level 1)
Other
Observable
Inputs
(Level 2)
Unobservable
Inputs
(Level 3)
 (In millions)
Money market funds$161.2 $161.2 $— $— 
Commercial paper19.9 — 19.9 — 
Registered investment companies0.6 0.6 — — 
Equity securities11.2 11.2 — — 
Total$192.9 $173.0 $19.9 $— 
 Fair value measurement as of December 31, 2022
 TotalQuoted Prices in
Active Markets
for Identical
Assets
(Level 1)
Other
Observable
Inputs
(Level 2)
Unobservable
Inputs
(Level 3)
 (In millions)
Money market funds$206.1 $206.1 $— $— 
Commercial paper49.9 — 49.9 — 
Registered investment companies0.7 0.7 — — 
Equity securities10.5 10.5 — — 
Total$267.2 $217.3 $49.9 $— 
Schedule of Estimated Fair Value and Principal Amount of Outstanding Debt
The following table summarizes the estimated fair value and principal amount for outstanding debt obligations excluding finance lease obligations:
 Fair ValuePrincipal Amount
 March 31, 2023December 31, 2022March 31, 2023December 31, 2022
 (In millions)
Term Loan$256.7 $259.4 $259.0 $262.3 
Schedule of Accounts Receivable Accounts Receivable
March 31, 2023December 31, 2022
 (In millions)
Billed receivables under long-term contracts$177.1 $126.3 
Other trade receivables0.3 0.3 
Accounts receivable$177.4 $126.6 
Schedule of Other Current Assets Other Current Assets
March 31, 2023December 31, 2022
 (In millions)
Deferred costs recoverable from the U.S. government $37.7 $36.9 
Income tax receivable20.4 24.7 
Inventories18.2 15.8 
Prepaid expenses17.2 16.4 
Other23.3 61.8 
Other current assets$116.8 $155.6 
Schedule of Property, Plant and Equipment, net Property, Plant and Equipment, net
March 31, 2023December 31, 2022
 (In millions)
Land$71.1 $71.1 
Buildings and improvements541.2 535.4 
Machinery and equipment, including capitalized software520.2 517.5 
Construction-in-progress31.7 37.5 
1,164.2 1,161.5 
Less: accumulated depreciation(752.3)(741.3)
Property, plant and equipment, net$411.9 $420.2 
Schedule of Other Noncurrent Assets Other Noncurrent Assets
March 31, 2023December 31, 2022
 (In millions)
Real estate held for entitlement and leasing$106.5 $105.9 
Deferred costs recoverable from the U.S. government 61.9 61.9 
Receivable from Northrop Grumman Corporation ("Northrop") for environmental remediation costs27.0 28.5 
Other12.1 11.9 
Other noncurrent assets$207.5 $208.2 
Schedule of Other Current Liabilities Other Current Liabilities
March 31, 2023December 31, 2022
 (In millions)
Accrued compensation and employee benefits$109.9 $157.2 
Other 57.3 61.5 
Other current liabilities$167.2 $218.7 
Schedule of Other Noncurrent Liabilities Other Noncurrent Liabilities
March 31, 2023December 31, 2022
 (In millions)
Uncertain income tax positions$181.2 $151.3 
Other 114.7 114.6 
Other current liabilities$295.9 $265.9