Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015	Nov. 30, 2015
Current Assets
Cash and cash equivalents	$ 155.5	$ 208.5	$ 211.1
Accounts receivable	182.3	169.5	171.5
Inventories	170.6	156.2	157.5
Recoverable from the U.S. government and other third parties for environmental remediation costs	27.1	24.0	24.0
Other current assets, net	70.8	69.2	64.4
Deferred income taxes	36.7	36.5	28.1
Total Current Assets	649.0	669.9	662.6
Noncurrent Assets
Property, plant and equipment, net	359.4	363.3	365.8
Real estate held for entitlement and leasing	87.3	86.2	86.2
Recoverable from the U.S. government and other third parties for environmental remediation costs	201.9	207.2	210.4
Deferred income taxes	286.2	288.3	286.7
Goodwill	158.1	158.1	158.1
Intangible assets	104.3	107.7	108.8
Other noncurrent assets, net	79.1	81.6	82.0
Total Noncurrent Assets	1,339.0	1,355.6	1,360.7
Total Assets	1,988.0	2,025.5	2,023.3
Current Liabilities
Short-term borrowings and current portion of long-term debt, net of deferred financing costs	5.2	5.3	5.3
Accounts payable	86.7	64.2	105.2
Reserves for environmental remediation costs	37.1	32.6	32.6
Postretirement medical and life insurance benefits	6.0	6.0	6.0
Advance payments on contracts	200.8	230.9	203.7
Other current liabilities	180.5	203.1	201.3
Total Current Liabilities	516.3	542.1	554.1
Noncurrent Liabilities
Senior debt, net of deferred financing costs	85.6	86.8	88.1
Second-priority senior notes, net of deferred financing costs	450.0	449.4	449.4
Convertible subordinated notes	84.8	84.8	84.8
Other debt, net of deferred financing costs	0.0	12.7	12.8
Reserves for environmental remediation costs	262.2	269.7	273.5
Pension benefits	575.0	580.6	566.2
Postretirement medical and life insurance benefits	44.1	44.8	45.5
Other noncurrent liabilities	94.0	95.2	94.4
Total Noncurrent Liabilities	1,595.7	1,624.0	1,614.7
Total Liabilities	$ 2,112.0	$ 2,166.1	$ 2,168.8
Commitments and contingencies
Redeemable common stock, par value of $0.10; 0.1 million shares issued and outstanding as of March 31, 2016, December 31, 2015, and November 30, 2015	$ 1.3	$ 1.6	$ 0.9
Stockholders’ Deficit
Preference stock, par value of $1.00; 15.0 million shares authorized; none issued or outstanding	0.0	0.0	0.0
Common stock, par value of $0.10; 150.0 million shares authorized; 63.1 million shares issued and outstanding as of March 31, 2016; 62.9 million shares issued and outstanding as of December 31, 2015 and November 30, 2015	6.5	6.5	6.5
Other capital	345.3	342.6	340.1
Treasury stock at cost, 3.5 million shares as of March 31, 2016, December 31, 2015 and November 30, 2015	(64.5)	(64.5)	(64.5)
Accumulated deficit	(74.7)	(79.8)	(86.8)
Accumulated other comprehensive loss, net of income taxes	(337.9)	(347.0)	(341.7)
Total Stockholders’ Deficit	(125.3)	(142.2)	(146.4)
Total Liabilities, Redeemable Common Stock and Stockholders’ Deficit	1,988.0	2,025.5	2,023.3
Northrop [Member]
Current Assets
Receivable from Northrop Grumman Corporation (“Northrop”)	6.0	6.0	6.0
Noncurrent Assets
Receivable from Northrop	$ 62.7	$ 63.2	$ 62.7