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Subsequent Event (Details) (Subsequent Event [Member], Doe & Ingalls [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
May 01, 2012
Subsequent Event [Member] | Doe & Ingalls [Member]
   
Subsequent Event [Line Items]    
Business Acquisition, Cost of Acquired Entity, Cash Paid   $ 175.0
Business Acquisition, Contingent Consideration, Potential Cash Payment   3.0
Revenue Reported by Acquired Entity $ 110.0