Inventory (Details) (USD $) In Millions, unless otherwise specified	Mar. 28, 2013	Dec. 31, 2012
Summary Of Inventories [Abstract]
Raw materials	$ 230.8	$ 250.3
Work-in-process	1,039.3	1,033.6
Finished goods	39.3	35.9
Net Inventory Raw Materials Finished Goods And Work In Process	1,309.4	1,319.8
Capitalized pre-production	510.0	524.6
Deferred Production Costs	1,296.1	1,173.8
Provision for Loss on Contracts	622.6	607.4
Inventory	$ 2,492.9	$ 2,410.8