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Inventories (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Inventory Disclosure [Abstract] |  |  |  |  |
Raw materials and supplies | $ 157.0 |  | $ 157.0 |  | $ 216.0
Work-in-process | 865.7 |  | 865.7 |  | 990.3
Finished goods | 169.4 |  | 169.4 |  | 184.1
Total inventories at current cost | 1,192.1 |  | 1,192.1 |  | 1,390.4
Adjustment from current cost to LIFO cost basis | 113.3 |  | 113.3 |  | 136.4
Inventory valuation reserves | (187.5) |  | (187.5) |  | (206.3)
Progress payments | (39.0) |  | (39.0) |  | (48.9)
Total inventories, net | 1,078.9 |  | 1,078.9 |  | $ 1,271.6
Inventory [Line Items] |  |  |  |  |
LIFO benefit (charge) |  |  | (23.1) | $ 80.3 |
NRV benefit (charge) |  |  | 23.5 | (80.3) |
Net cost of sales impact | 0.0 | $ (0.2) | 0.4 | 0.0 |
Inventory Valuation Reserve | Titanium products |  |  |  |  |
Inventory [Line Items] |  |  |  |  |
Inventory valuation charges |  |  | $ 17.7 | $ 16.6 |
Inventory Valuation Reserve | Titanium Sponge Inventory |  |  |  |  |
Inventory [Line Items] |  |  |  |  |
Inventory valuation charges | $ 11.3 |  |  |  |

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