Contingencies (Details) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Changes in the carrying amount of environmental remediation obligations
Balance at December 31, 2011	$ 68,300,000
Accruals and adjustments	6,500,000
Payments	(1,900,000)
Foreign currency translation and other	300,000
Balance at March 31, 2012	73,200,000
Deferred Settlement Credits Activity
Balance at December 31, 2011	43,500,000
Proceeds from Insurance Settlements
Amounts recorded as reduction of costs	(5,100,000)
Balance at March 31, 2012	38,400,000
Current and long-term portions of the deferred settlement credits
Accrued expenses	9,200,000		7,200,000
Other non-current liabilities	29,200,000		36,300,000
Deferred settlement credit	38,400,000
Contingencies (Textual) [Abstract]
Accrued liability for environmental remediation included as accrued expenses	15,200,000		13,300,000
Accrued liability for environmental remediation associated with ongoing operations	38,200,000		32,800,000
Accrued liability for environmental remediation associated with previously owned business	35,000,000		35,500,000
Maximum period to complete remediation	30 years
Minimum period for operation & monitoring costs	15 years
Maximum period for operation & monitoring costs	25 years
Minimum manufacturing period	20 years
Estimated original equipment sales for program, minimum	10,000,000,000
Total in-process inventory related to long-term contracts under the contract accounting method of accounting	18,500,000
Customer Advances related to JSTARS	8,800,000
Recognized Tax Benefit		$ 21,000,000