Fair Value Measurement (Narrative) (Details) (USD $)	12 Months Ended						1 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2010 Parent Company [Member]	Dec. 31, 2011 Zero-Coupon Government Bonds [Member] Quoted Prices In Active Markets (Level 1) [Member]	Dec. 31, 2011 Zero-Coupon Government Bonds [Member] Significant Other Observable Inputs (Level 2) [Member]	Dec. 31, 2011 Aerospace [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net asset value per share	$ 1.00
Fair value of financial asset					$ 9,600,000	$ 900,000
Contingent consideration in other current liabilities	4,000,000
Proceeds from divestiture of business	376,025,000	181,550,000	314,213,000	53,466,000			280,000,000
Contingent consideration in other liabilities	$ 5,700,000