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Inventories (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Inventory Disclosure [Abstract]
Raw materials and supplies	$ 291.2		$ 277.6
Work-in-process	1,069.3		984.9
Finished goods	161.3		162.1
Total inventories at current cost	1,521.8		1,424.6
Adjustment from current cost to LIFO cost basis	20.4		29.4
Inventory valuation reserves	(73.7)		(84.3)
Progress payments	(60.0)		(47.6)
Total inventories, net	1,408.5		1,322.1
Inventory [Line Items]
Lifo Provision Benefit	9.0	0.5
Change in inventory valuation reserve	(9.0)
Flat Rolled Products
Inventory [Line Items]
Change in inventory valuation reserve	$ 8.3

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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