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Inventories (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Inventory Disclosure [Abstract] |  |  |
Raw materials and supplies | $ 148.8 |  | $ 149.6
Work-in-process | 855.5 |  | 837.9
Finished goods | 160.0 |  | 161.7
Total inventories at current cost | 1,164.3 |  | 1,149.2
Adjustment from current cost to LIFO cost basis | 89.3 |  | 97.3
Inventory valuation reserves | (157.6) |  | (169.0)
Progress payments | (44.1) |  | (40.5)
Total inventories, net | 1,051.9 |  | $ 1,037.0
Inventory [Line Items] |  |  |
LIFO benefit (charge) | (8.1) | $ (0.3) |
NRV benefit (charge) | 8.1 | 0.3 |
Net cost of sales impact | $ 0.0 | 0.0 |
Inventory Valuation Reserve | Titanium products |  |  |
Inventory [Line Items] |  |  |
Inventory valuation charges |  | $ 10.0 |

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