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Inventories (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Inventory Disclosure [Abstract]
Raw materials and supplies	$ 239.2		$ 249.3
Work-in-process	1,166.3		1,184.1
Finished goods	191.8		172.2
Total inventories at current cost	1,597.3		1,605.6
Adjustment from current cost to LIFO cost basis	9.3		4.8
Inventory valuation reserves	(71.0)		(68.8)
Progress payments	(62.7)		(68.8)
Total inventories, net	1,472.9		$ 1,472.8
Inventory [Line Items]
Lifo Provision (Benefit)	(4.5)	$ 37.9
High Performance Materials & Components
Inventory [Line Items]
Change in inventory valuation reserve	4.3	(35.0)
Flat Rolled Products
Inventory [Line Items]
Change in inventory valuation reserve	$ 11.4	$ 13.1

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