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Balance Sheet Accounts (Tables)
 9 Months Ended
Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Fair Value of Financial Instruments
 Fair value measurement as of September 30, 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$659.8 $659.8 $— $— 
Registered investment companies2.8 2.8 — — 
Equity securities1.5 1.5 — — 
Total$664.1 $664.1 $— $— 
 Fair value measurement as of December 31, 2019
 TotalQuoted Prices in
Active Markets
for Identical
Assets
(Level 1)
Other
Observable
Inputs
(Level 2)
Unobservable
Inputs
(Level 3)
 (In millions)
Money market funds$626.0 $626.0 $— $— 
Registered investment companies3.7 3.7 — — 
Commercial paper99.9 — 99.9 — 
Total$729.6 $629.7 $99.9 $— 
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
 September 30, 2020December 31, 2019September 30, 2020December 31, 2019
 (In millions)
Term loan$304.0 $328.1 $315.0 $328.1 
21/4% Notes
478.1 546.0 300.0 300.0 
Total$782.1 $874.1 $615.0 $628.1 
Schedule of Accounts Receivable Accounts Receivable, net
September 30, 2020December 31, 2019
 (In millions)
Billed receivables under long-term contracts$183.1 $122.9 
Reserve on billed trade receivables(1.0)(10.6)
Other trade receivables0.3 0.2 
Accounts receivable, net$182.4 $112.5 
Schedule of Other Current Assets, net Other Current Assets, net
September 30, 2020December 31, 2019
 (In millions)
Deferred costs recoverable from the U.S. government $43.5 $47.1 
Income taxes receivable48.3 43.4 
Inventories10.7 24.0 
Prepaid expenses16.3 13.9 
Other19.7 17.4 
Other current assets, net$138.5 $145.8 
Schedule of Property, Plant and Equipment, net Property, Plant and Equipment, net
September 30, 2020December 31, 2019
 (In millions)
Land$71.2 $71.2 
Buildings and improvements435.4 434.9 
Machinery and equipment, including capitalized software460.9 488.2 
Construction-in-progress86.4 70.2 
1,053.9 1,064.5 
Less: accumulated depreciation(650.1)(654.6)
Property, plant and equipment, net$403.8 $409.9 
Schedule of Other Noncurrent Assets, net Other Noncurrent Assets, net
September 30, 2020December 31, 2019
 (In millions)
Real estate held for entitlement and leasing$101.7 $100.3 
Deferred costs recoverable from the U.S. government 56.5 54.8 
Receivable from Northrop Grumman Corporation for environmental remediation costs42.0 46.5 
Other47.2 54.0 
Other noncurrent assets, net$247.4 $255.6 
Schedule of Other Current Liabilities Other Current Liabilities
September 30, 2020December 31, 2019
 (In millions)
Accrued compensation and employee benefits$102.1 $103.1 
Other 42.1 52.4 
Other current liabilities$144.2 $155.5