Inventories (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Average or actual cost (which approximates current costs):
Finished products	$ 220.8	$ 224.4
In-process	2,360.6	1,866.1
Raw materials and supplies	753.7	692.8
Inventory, gross	3,335.1	2,783.3
Less:
Reserve to reduce certain inventories to LIFO basis	(54.2)	(52.7)
Progress payments and advances	(404.3)	(281.2)
Total	$ 2,876.6	$ 2,449.4