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Inventories | 12 Months Ended
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Dec. 31, 2021
Inventory Disclosure [Abstract] |
Inventories | Inventories We use the last-in, first-out (LIFO) method for the majority of our inventories located in the continental U.S. Other inventories are valued by the first-in, first-out (FIFO) method. FIFO cost approximates current replacement cost. Inventories measured using LIFO must be valued at the lower of cost or market. Inventories measured using FIFO must be valued at the lower of cost or net realizable value. Inventories at December 31 consisted of the following:
| 2021 |  | 2020
Finished products | $ | 761.9 |  |  | $ | 758.9 |
Work in process | 2,372.7 |  |  | 2,535.4 |
Raw materials and supplies | 717.2 |  |  | 651.2 |
Total (approximates replacement cost) | 3,851.8 |  |  | 3,945.5 |
Increase to LIFO cost | 34.2 |  |  | 34.8 |
Inventories | $ | 3,886.0 |  |  | $ | 3,980.3 |
Inventories valued under the LIFO method comprised $1.36 billion and $1.21 billion of total inventories at December 31, 2021 and 2020, respectively. We recognized a net inventory impairment charge related to our COVID-19 antibodies of $339.7 million during the year ended December 31, 2021 in cost of sales in our consolidated statements of operations. As part of our response to the COVID-19 pandemic, and at the request of the U.S. and international governments, we invested in large-scale manufacturing of COVID-19 antibodies at risk, in order to ensure rapid access to patients around the world. As the COVID-19 pandemic evolved during 2021, we incurred a net inventory impairment charge primarily due to the combination of changes to current and forecasted demand from U.S. and international governments, including changes to our agreement with the U.S. government, and near-term expiry dates of COVID-19 antibodies.

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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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