Inventory (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Components of inventories
Raw materials	$ 109,800,000	$ 101,800,000
Work in process	276,100,000	230,500,000
Finished goods	120,700,000	115,100,000
Total inventory	506,557,000	447,373,000
Inventory, Various Programs, Gross	$ 54,200,000