Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	6 Months Ended
	May 31, 2012	May 31, 2011
Operating Activities
Net income	$ 4.1	$ 1.2
Adjustments to reconcile net income to net cash provided by operating activities:
(Income) loss from discontinued operations, net of income taxes	(0.4)	1.2
Depreciation and amortization	10.8	11.5
Amortization of debt discount and financing costs	1.2	3.4
Stock-based compensation	2.2	2.9
Retirement benefit expense	20.5	23.2
Gain on debt repurchased		(0.2)
Loss on debt redeemed	0.4
Tax benefit on stock-based awards	(0.7)
Changes in assets and liabilities:
Accounts receivable	(0.8)	(10.6)
Inventories	12.1	13.4
Other receivables, prepaid expenses and other	3.0	2.9
Income tax receivable	2.8	1.1
Real estate held for entitlement and leasing	(1.2)	(1.3)
Receivable from Northrop	(0.5)	(0.3)
Recoverable from the U.S. government and other third parties for environmental remediation costs	5.5	8.4
Other noncurrent assets	4.4	3.1
Accounts payable	5.8	5.9
Pension benefits		0.2
Postretirement medical and life benefits	(2.7)	(2.8)
Advance payments on contracts	(7.1)	(14.0)
Other current liabilities	(3.6)	(3.9)
Deferred income taxes	1.5	0.4
Reserves for environmental remediation costs	(5.7)	(8.9)
Other noncurrent liabilities	(4.2)	(4.3)
Net cash provided by continuing operations	47.4	32.5
Net cash used in discontinued operations	(0.1)	(0.3)
Net Cash Provided by Operating Activities	47.3	32.2
Investing Activities
Purchases of marketable securities		(15.0)
Sales of marketable securities		26.7
Proceeds from sale of property	0.6
Capital expenditures	(9.3)	(6.7)
Net Cash (Used in) Provided by Investing Activities	(8.7)	5.0
Financing Activities
Tax benefit on stock-based awards	0.7
Debt issuance costs	(0.3)
Vendor financing repayments	(0.4)	(0.5)
Debt repayments	(76.4)	(7.4)
Net Cash Used in Financing Activities	(76.4)	(7.9)
Net (Decrease) Increase in Cash and Cash Equivalents	(37.8)	29.3
Cash and Cash Equivalents at Beginning of Period	188.0	181.5
Cash and Cash Equivalents at End of Period	150.2	210.8
Supplemental disclosures of cash flow information
Cash paid for interest	12.1	11.3
Cash refunds for federal income taxes	6.0
Federal income taxes
Supplemental disclosures of cash flow information
Cash paid for income taxes	3.4	0.4
State income taxes
Supplemental disclosures of cash flow information
Cash paid for income taxes	$ 3.1	$ 1.2