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Inventories | 12 Months Ended
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Dec. 31, 2018
Inventory Disclosure [Abstract] |
Inventories | Inventories Inventories consisted of the following:
| December 31,
(in Millions) | 2018 |  | 2017
Finished goods | $ | 430.4 |  |  | $ | 349.6 |
Work in process | 518.8 |  |  | 508.1 |
Raw materials, supplies and other | 206.9 |  |  | 211.9 |
FIFO inventory | $ | 1,156.1 |  |  | $ | 1,069.6 |
Less: Excess of FIFO cost over LIFO cost | (130.6 | ) |  | (126.8 | )
Net inventories | $ | 1,025.5 |  |  | $ | 942.8 |
Approximately 25% and 22% of our inventories in 2018 and 2017, respectively were recorded on the LIFO basis.

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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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