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Balance Sheet Accounts
 3 Months Ended
Mar. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Balance Sheet Accounts Balance Sheet Accounts
a. Fair Value of Financial Instruments
Financial instruments are classified using a three-tiered fair value hierarchy, which prioritizes the inputs used in measuring fair value. These tiers include: Level 1, defined as observable inputs such as quoted prices in active markets; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable; and Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions.
 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 $— 
As of March 31, 2023 and December 31, 2022, the total estimated fair value for commercial paper was classified as cash and cash equivalents as the remaining maturity at date of purchase was less than three months.
The carrying amounts of certain of the Company’s financial instruments, including cash and cash equivalents, restricted cash, accounts receivable, accounts payable, accrued compensation, and other accrued liabilities, approximate fair value because of their short maturities.
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 
The fair value of the Term Loan (as defined below) was estimated based on a third-party model used to derive a relative value price using comparable corporate loans within a similar industry, credit quality, and currency.
b. 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 
c. 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 
d. 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 
e. 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 
f. 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 
g.  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