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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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