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Inventory | 3 Months Ended
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Mar. 31, 2018
Inventory Disclosure [Abstract] |
Inventory | Inventory The components of inventory are summarized as follows:
(In millions) | As of March 31, 2018 |  | As of December 31, 2017
Raw materials | $ | 164.3 |  |  | $ | 162.4 |
Work in process | 594.3 |  |  | 605.7 |
Finished goods | 148.0 |  |  | 157.4 |
Total inventory | $ | 906.6 |  |  | $ | 925.5 |
Balance Sheet Classification: |  |  |
Inventory | $ | 890.8 |  |  | $ | 902.7 |
Investments and other assets | 15.8 |  |  | 22.8 |
Total inventory | $ | 906.6 |  |  | $ | 925.5 |
Long-term inventory, which primarily consists of work in process, is included in investments and other assets in our condensed consolidated balance sheets.

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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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