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Inventories (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Inventory Disclosure [Abstract]      
Raw materials and supplies $ 235.0   $ 249.3
Work-in-process 1,052.2   1,184.1
Finished goods 190.0   172.2
Total inventories at current cost 1,477.2   1,605.6
Adjustment from current cost to LIFO cost basis 85.1   4.8
Inventory valuation reserves (152.9)   (68.8)
Progress payments (53.3)   (68.8)
Total inventories, net 1,356.1   $ 1,472.8
Inventory [Line Items]      
Inventory, LIFO Reserve, Effect on Income, Net (80.3) $ 47.9  
Net realizable value on LIFO inventory [Member]      
Inventory [Line Items]      
Change in inventory valuation reserve 80.3 (35.0)  
Industrial titanium products [Member]      
Inventory [Line Items]      
Change in inventory valuation reserve $ 16.6 $ 18.3