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Inventories | 9 Months Ended
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Sep. 30, 2016
Inventory Disclosure [Abstract] |
Inventories | Inventories Inventories at September 30, 2016 and December 31, 2015 were as follows (in millions):
| September 30, 2016 |  | December 31, 2015
Raw materials and supplies | $ | 157.0 |  |  | $ | 216.0 |
Work-in-process | 865.7 |  |  | 990.3 |
Finished goods | 169.4 |  |  | 184.1 |
Total inventories at current cost | 1,192.1 |  |  | 1,390.4 |
Adjustment from current cost to LIFO cost basis | 113.3 |  |  | 136.4 |
Inventory valuation reserves | (187.5 | ) |  | (206.3 | )
Progress payments | (39.0 | ) |  | (48.9 | )
Total inventories, net | $ | 1,078.9 |  |  | $ | 1,271.6 |
Inventories are stated at the lower of cost (last-in, first-out (LIFO), first-in, first-out (FIFO), and average cost methods) or market, less progress payments. Most of the Company’s inventory is valued utilizing the LIFO costing methodology. Inventory of the Company’s non-U.S. operations is valued using average cost or FIFO methods. Due to deflationary impacts primarily related to raw materials, the carrying value of the Company’s inventory as valued on LIFO exceeds current replacement cost, and based on a lower of cost or market value analysis, a net realizable value (NRV) inventory reserve is required. Impacts to cost of sales for changes in the LIFO costing methodology and associated NRV inventory reserves were as follows (in millions):
|  | Nine months ended September 30,
|  | 2016 |  | 2015
LIFO benefit (charge) |  | $ | (23.1 | ) |  | $ | 80.3 |
NRV benefit (charge) |  | 23.5 |  |  | (80.3 | )
Net cost of sales impact |  | $ | 0.4 |  |  | $ | — |
The first nine months of 2016 and 2015 results included $17.7 million and $16.6 million, respectively, in inventory valuation charges related to the market-based valuation of titanium products. Additionally, in the third quarter of 2016, in conjunction with the indefinite idling of the Company’s Rowley, UT titanium sponge facility (see Note 10 for further explanation), an additional $11.3 million charge was taken to revalue titanium sponge inventory based on revised assessments of industrial grade titanium market conditions and expected utilization of this inventory.

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 + Details
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