Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Current Assets
Cash and cash equivalents	$ 410.3	$ 208.5
Accounts receivable	136.4	169.5
Inventories	185.1	156.2
Recoverable from the U.S. government and other third parties for environmental remediation costs	25.2	24.0
Receivable from Northrop Grumman Corporation (“Northrop”)	6.0	6.0
Other current assets, net	91.7	69.2
Total Current Assets	854.7	633.4
Noncurrent Assets
Property, plant and equipment, net	366.0	363.3
Real estate held for entitlement and leasing	91.8	86.2
Recoverable from the U.S. government and other third parties for environmental remediation costs	239.8	207.2
Receivable from Northrop	62.0	63.2
Deferred income taxes	292.5	324.8
Goodwill	158.1	158.1
Intangible assets	94.4	107.7
Other noncurrent assets, net	90.2	81.6
Total Noncurrent Assets	1,394.8	1,392.1
Total Assets	2,249.5	2,025.5
Current Liabilities
Short-term borrowings and current portion of long-term debt	55.6	5.3
Accounts payable	96.2	64.2
Reserves for environmental remediation costs	37.1	32.6
Postretirement medical and life insurance benefits	5.2	6.0
Advance payments on contracts	221.8	230.9
Other current liabilities	167.8	203.1
Total Current Liabilities	583.7	542.1
Noncurrent Liabilities
Long-term debt	608.0	633.7
Reserves for environmental remediation costs	312.6	269.7
Pension benefits	548.2	580.6
Postretirement medical and life insurance benefits	37.4	44.8
Other noncurrent liabilities	124.0	95.2
Total Noncurrent Liabilities	1,630.2	1,624.0
Total Liabilities	2,213.9	2,166.1
Commitments and contingencies (Note 7)
Redeemable common stock, par value of $0.10; 0.1 million shares issued and outstanding as of December 31, 2016 and 2015	1.1	1.6
Stockholders’ Equity (Deficit)
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; 69.2 million shares issued and outstanding as of December 31, 2016; 62.9 million shares issued and outstanding as of December 31, 2015	6.9	6.5
Other capital	456.9	342.6
Treasury stock at cost, 3.5 million shares as of December 31, 2016 and 2015	(64.5)	(64.5)
Accumulated deficit	(61.8)	(79.8)
Accumulated other comprehensive loss, net of income taxes	(303.0)	(347.0)
Total Stockholders’ Equity (Deficit)	34.5	(142.2)
Total liabilities, redeemable common stock, and stockholders’ (deficit) equity	$ 2,249.5	$ 2,025.5