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Inventory | 12 Months Ended
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Dec. 31, 2017
Inventory Disclosure [Abstract] |
Inventory | Inventory The components of inventory are summarized as follows:
| As of December 31,
(In millions) | 2017 |  | 2016
Raw materials | $ | 162.4 |  |  | $ | 170.4 |
Work in process | 605.7 |  |  | 698.7 |
Finished goods | 157.4 |  |  | 170.3 |
Total inventory | $ | 925.5 |  |  | $ | 1,039.4 |
Balance Sheet Classification: |  |  |
Inventory | $ | 902.7 |  |  | $ | 1,001.6 |
Investments and other assets | 22.8 |  |  | 37.8 |
Total inventory | $ | 925.5 |  |  | $ | 1,039.4 |
Balances in the table above as of December 31, 2017 reflect the elimination of certain amounts transferred to Bioverativ in connection with the completion of the spin-off of our hemophilia business. Balances transferred to Bioverativ related to work in process and finished goods inventory totaled $84.5 million and $31.6 million, respectively. For additional information on the spin-off of our hemophilia business, please read Note 3, Hemophilia Spin-Off, to these consolidated financial statements. Long-term inventory, which primarily consists of work in process, is included in investments and other assets in our consolidated balance sheets. Inventory amounts written down as a result of excess, obsolescence, unmarketability or other reasons are charged to cost of sales, and totaled $76.9 million, $48.2 million and $41.9 million for the years ended December 31, 2017, 2016 and 2015, respectively.

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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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