Business Acquisition and Goodwill (Details) (Spacecraft Business, USD $) In Millions | 9 Months Ended | |
|---|---|---|
Sep. 30, 2011 | Apr. 02, 2010 | |
Spacecraft Business | ||
| Business Acquisition [Line Items] | ||
| Amount of cash paid to acquire certain assets and liabilities | $ 55 | |
| Goodwill Purchase Accounting Adjustment [Abstract] | ||
| Goodwill Purchase Accounting Adjustments | $ 0.5 |