Completed Acquisitions Other Information (Details) (USD $) In Millions, unless otherwise specified		12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011 Doe & Ingalls [Member]	May 01, 2012 Doe & Ingalls [Member]	Jun. 30, 2012 Other Acquisitions [Member]
Other Information
Purchase Price Paid			$ 175.0	$ 2.5
Contingent Consideration, Potential Cash Payment			3.0	5.0
Revenue Reported by Acquired Entity		110.0
Goodwill, Expected Tax Deductible Amount			53.0
Purchase Price Paid For Acquisitions Completed In A Prior Year	$ 2.4