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Balance Sheet Accounts (Tables)
 9 Months Ended
Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Fair Value of Financial Instruments
 Fair value measurement as of September 30, 2021
 TotalQuoted Prices in
Active Markets
for Identical
Assets
(Level 1)
Other
Observable
Inputs
(Level 2)
Unobservable
Inputs
(Level 3)
 (In millions)
Money market funds$328.6 $328.6 $— $— 
Registered investment companies1.6 1.6 — — 
Commercial paper10.0 — 10.0 — 
Equity securities9.8 9.8 — — 
Total$350.0 $340.0 $10.0 $— 
 Fair value measurement as of December 31, 2020
 TotalQuoted Prices in
Active Markets
for Identical
Assets
(Level 1)
Other
Observable
Inputs
(Level 2)
Unobservable
Inputs
(Level 3)
 (In millions)
Money market funds$569.3 $569.3 $— $— 
Registered investment companies2.5 2.5 — — 
Commercial paper232.0 — 232.0 — 
Equity securities7.0 7.0 — — 
Total$810.8 $578.8 $232.0 $— 
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
 September 30, 2021December 31, 2020September 30, 2021December 31, 2020
 (In millions)
Term loan$281.9 $306.5 $288.8 $308.5 
21/4% Notes
246.4 609.5 145.9 300.0 
Total$528.3 $916.0 $434.7 $608.5 
Schedule of Accounts Receivable Accounts Receivable
September 30, 2021December 31, 2020
 (In millions)
Billed receivables under long-term contracts$84.8 $75.3 
Other trade receivables0.4 0.3 
Accounts receivable$85.2 $75.6 
Schedule of Other Current Assets Other Current Assets
September 30, 2021December 31, 2020
 (In millions)
Deferred costs recoverable from the U.S. government $40.2 $41.0 
Income tax receivable30.1 46.9 
Inventories11.5 10.0 
Prepaid expenses17.5 18.0 
Other22.0 20.6 
Other current assets$121.3 $136.5 
Schedule of Property, Plant and Equipment, net Property, Plant and Equipment, net
September 30, 2021December 31, 2020
 (In millions)
Land$71.1 $71.2 
Buildings and improvements471.8 433.4 
Machinery and equipment, including capitalized software486.0 471.3 
Construction-in-progress71.2 105.5 
1,100.1 1,081.4 
Less: accumulated depreciation(690.6)(658.3)
Property, plant and equipment, net$409.5 $423.1 
Schedule of Other Noncurrent Assets Other Noncurrent Assets
September 30, 2021December 31, 2020
 (In millions)
Real estate held for entitlement and leasing$103.4 $101.8 
Deferred costs recoverable from the U.S. government 55.0 54.7 
Receivable from Northrop Grumman Corporation for environmental remediation costs36.0 40.5 
Other42.6 57.8 
Other noncurrent assets$237.0 $254.8 
Schedule of Other Current Liabilities Other Current Liabilities
September 30, 2021December 31, 2020
 (In millions)
Accrued compensation and employee benefits$115.1 $118.0 
Dividend payable1.7 447.8 
Other 46.6 43.9 
Other current liabilities$163.4 $609.7