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Inventories | 9 Months Ended
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Sep. 30, 2019
Inventory Disclosure [Abstract] |
Inventories | Inventories Inventories at September 30, 2019 and December 31, 2018 were as follows (in millions):
| September 30, 2019 |  | December 31, 2018
Raw materials and supplies | $ | 199.6 |  |  | $ | 191.5 |
Work-in-process | 863.5 |  |  | 914.1 |
Finished goods | 180.9 |  |  | 191.1 |
Total inventories at current cost | 1,244.0 |  |  | 1,296.7 |
Adjustment from current cost to LIFO cost basis | 6.7 |  |  | 2.9 |
Inventory valuation reserves | (82.2 | ) |  | (88.5 | )
Total inventories, net | $ | 1,168.5 |  |  | $ | 1,211.1 |
Inventories are stated at the lower of cost (last-in, first-out (LIFO), first-in, first-out (FIFO), and average cost methods) or market. 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, the Company maintains NRV inventory valuation reserves to adjust carrying value of LIFO inventory to current replacement cost. These NRV reserves were $6.7 million at September 30, 2019 and $8.0 million at December 31, 2018. 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,
|  | 2019 |  | 2018
LIFO benefit (charge) |  | $ | (1.4 | ) |  | $ | (29.5 | )
NRV benefit (charge) |  | 1.3 |  |  | 29.5 |
Net cost of sales impact |  | $ | (0.1 | ) |  | $ | — |
ATI’s overall LIFO inventory valuation reserves also increased above replacement cost by $5.2 million at September 30, 2019 compared to December 31, 2018 due to the second quarter 2019 sale of the industrial forgings business, which used the LIFO costing methodology and maintained a LIFO valuation below current replacement cost.

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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