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Inventories | 6 Months Ended
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Jun. 30, 2018
Inventory, Net [Abstract] |
Inventories | Inventories
Inventories consist of the following: | June 30, 2018 |  | December 31, 2017
Raw materials | $ | 125.8 |  |  | $ | 106.2 |
Work-in-process | 55.9 |  |  | 49.6 |
Finished goods | 42.3 |  |  | 40.9 |
Operating and other supplies | 139.0 |  |  | 120.8 |
Total inventories | $ | 363.0 |  |  | $ | 317.5 |
Inventories are stated at the lower of cost or Net Realizable Value ("NRV") using the first-in, first-out ("FIFO") or the weighted average cost method.

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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 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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- References No definition available. + Details
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