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Inventories (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Inventory Disclosure [Abstract]
Raw materials and supplies	$ 207.5		$ 216.0
Work-in-process	910.5		990.3
Finished goods	164.7		184.1
Total inventories at current cost	1,282.7		1,390.4
Adjustment from current cost to LIFO cost basis	136.1		136.4
Inventory valuation reserves	(206.4)		(206.3)
Progress payments	(46.1)		(48.9)
Total inventories, net	1,166.3		$ 1,271.6
Inventory [Line Items]
LIFO charge	(0.3)	$ (0.5)
NRV benefit	0.3	0.5
Net cost of sales impact	0.0	0.0
Inventory Valuation Reserve | Titanium products [Member]
Inventory [Line Items]
Inventory valuation charges	$ 10.0	$ 5.3

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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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