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Inventories (Tables) | 3 Months Ended
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Mar. 31, 2019
Inventory Disclosure [Abstract] |
Components of Inventories | The components of inventories were as follows (dollars in millions):
|  | March 31, |  |  | December 31, |
|  | 2019 |  |  | 2018 |
Raw materials |  | $ | 330.1 |  |  | $ | 307.8 |
Work in process |  |  | 13.6 |  |  |  | 13.9 |
Finished goods |  |  | 210.5 |  |  |  | 199.0 |
Supplies and materials |  |  | 277.5 |  |  |  | 274.9 |
Inventories |  | $ | 831.7 |  |  | $ | 795.6 |

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