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Inventory | 3 Months Ended
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Mar. 31, 2023
Inventory Disclosure [Abstract] |
Inventory | The components of inventory are summarized as follows:
(In millions) |  | As of March 31, 2023 |  | As of December 31, 2022
Raw materials |  | $ | 432.4 |  |  | $ | 413.2 |
Work in process |  | 684.9 |  |  | 751.9 |
Finished goods |  | 205.9 |  |  | 200.4 |
Total inventory |  | $ | 1,323.2 |  |  | $ | 1,365.5 |
Balance Sheet Classification: |  |  |  |
Inventory |  | $ | 1,281.0 |  |  | $ | 1,344.4 |
Investments and other assets |  | 42.2 |  |  | 21.1 |
Total inventory |  | $ | 1,323.2 |  |  | $ | 1,365.5 |
During the first quarter of 2022 we wrote-off approximately $275.0 million of inventory related to ADUHELM, as a result of the final NCD, which was recognized in cost of sales within our condensed consolidated statements of income for the three months ended March 31, 2022. We recognized approximately $136.0 million related to Eisai's 45.0% share of these charges in collaboration profit sharing/(loss reimbursement) within our condensed consolidated statements of income for the three months ended March 31, 2022. As of March 31, 2023 and December 31, 2022, the carrying value of our ADUHELM inventory was immaterial.

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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 https://asc.fasb.org/topic&trid=2126998 + Details
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