Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Current Assets
Cash and cash equivalents	$ 392.5	$ 410.3
Accounts receivable	283.1	136.4
Inventories	160.8	185.1
Recoverable from the U.S. government and other third parties for environmental remediation costs	26.7	25.2
Receivable from Northrop Grumman Corporation (“Northrop”)	6.0	6.0
Other current assets, net	71.0	91.7
Total Current Assets	940.1	854.7
Noncurrent Assets
Property, plant and equipment, net	349.6	366.0
Real estate held for entitlement and leasing	93.4	91.8
Recoverable from the U.S. government and other third parties for environmental remediation costs	225.5	239.8
Receivable from Northrop	60.0	62.0
Deferred income taxes	251.2	292.5
Goodwill	160.0	158.1
Intangible assets	88.4	94.4
Other noncurrent assets, net	126.7	90.2
Total Noncurrent Assets	1,354.8	1,394.8
Total Assets	2,294.9	2,249.5
Current Liabilities
Current portion of long-term debt	22.4	55.6
Accounts payable	126.2	96.2
Reserves for environmental remediation costs	35.8	37.1
Postretirement medical and life insurance benefits	5.2	5.2
Advance payments on contracts	182.7	221.8
Other current liabilities	192.6	167.8
Total Current Liabilities	564.9	583.7
Noncurrent Liabilities
Long-term debt	596.2	608.0
Reserves for environmental remediation costs	298.6	312.6
Pension benefits	486.5	548.2
Postretirement medical and life insurance benefits	35.4	37.4
Other noncurrent liabilities	162.0	124.0
Total Noncurrent Liabilities	1,578.7	1,630.2
Total Liabilities	2,143.6	2,213.9
Commitments and contingencies (Note 8)
Redeemable common stock, par value of $0.10; 0.1 million shares issued and outstanding as of December 31, 2016	0.0	1.1
Stockholders’ Equity
Preference stock, par value of $1.00; 15.0 million shares authorized; none issued or outstanding	0.0	0.0
Common stock, par value of $0.10; 150.0 million shares authorized; 73.6 million shares issued and outstanding as of September 30, 2017; 69.2 million shares issued and outstanding as of December 31, 2016	7.4	6.9
Other capital	501.3	456.9
Treasury stock at cost, 3.5 million shares as of September 30, 2017 and December 31, 2016	(64.5)	(64.5)
Accumulated deficit	(19.0)	(61.8)
Accumulated other comprehensive loss, net of income taxes	(273.9)	(303.0)
Total Stockholders’ Equity	151.3	34.5
Total Liabilities, Redeemable Common Stock and Stockholders’ Equity	$ 2,294.9	$ 2,249.5