Significant Accounting Policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Additional Significant Accounting Policies (Textual) [Abstract]
Billable amount expected to be collected after	$ 132,500,000
Unbilled Receivable Included in Accounts Receivable	271,000,000	206,600,000
Receivable balances billed but not paid by customers under retainage provisions in contracts	0
Receivables that represent claims or other disagreements	0
Research and development expenditures from continuing operations, net	247,000,000	247,000,000	239,000,000
Research and development expenditures from continuing operations funded by customers	119,000,000	85,000,000	101,000,000
Net income from discontinued operations	300,000	2,200,000	34,500,000
Tax on income from discontinued operations			20,800,000
Effect of Change in accounting estimate on income from continuing operation before income tax	108,100,000	98,000,000	45,100,000
Effect of Change in accounting estimate on income from continuing operation After income tax	68,600,000	61,300,000	28,300,000
Effect of Change in accounting estimate on earnings per share	$ 0.54	$ 0.49	$ 0.23
Participation Payments [Member]
Component of Operating Other Cost and Expense [Line Items]
Impairment charges	0	0	0
Sales Incentives [Member]
Component of Operating Other Cost and Expense [Line Items]
Impairment charges for Sales Incentives	Not significant	Not significant	Not significant
Flight Certification Costs [Member]
Component of Operating Other Cost and Expense [Line Items]
Impairment charges	0	0	0
Entry Fees [Member]
Component of Operating Other Cost and Expense [Line Items]
Impairment charges	$ 0	$ 0	$ 0
Building And Improvement [Member]
Significant Accounting Policies (Textual) [Abstract]
Minimum period of computation of depreciation and amortization, in years	15
Maximum period of computation of depreciation and amortization, in years	40
Machinery and Equipment [Member]
Significant Accounting Policies (Textual) [Abstract]
Minimum period of computation of depreciation and amortization, in years	5
Maximum period of computation of depreciation and amortization, in years	15
Internal Use Software [Member]
Significant Accounting Policies (Textual) [Abstract]
Minimum period of computation of depreciation and amortization, in years	2
Maximum period of computation of depreciation and amortization, in years	10
Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of ownership required for accounting under equity method of accounting	50.00%
Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of ownership required for accounting under equity method of accounting	20.00%