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Inventories | 3 Months Ended
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Mar. 31, 2018
Inventory Disclosure [Abstract] |
Inventories |
8. | Inventories
We value our raw materials, work in process, and finished goods inventories using lower of cost, as determined by the average cost method, or market. Supplies and materials are valued at the first-in, first-out (FIFO) or average cost methods. The components of inventories were as follows (dollars in millions):
|  | March 31, |  |  | December 31, |
|  | 2018 |  |  | 2017 |
Raw materials |  | $ | 293.9 |  |  | $ | 279.8 |
Work in process |  |  | 14.4 |  |  |  | 12.6 |
Finished goods |  |  | 202.2 |  |  |  | 217.0 |
Supplies and materials |  |  | 255.9 |  |  |  | 253.1 |
Inventories |  | $ | 766.4 |  |  | $ | 762.5 |

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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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