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Inventory
12 Months Ended
Dec. 31, 2020
Inventory Disclosure [Abstract]  
Inventory Inventory
The components of inventory are summarized as follows:
 As of December 31,
(In millions)20202019
Raw materials$314.9 $169.7 
Work in process544.5 460.0 
Finished goods209.2 174.5 
Total inventory$1,068.6 $804.2 
Inventory amounts written down as a result of excess, obsolescence, unmarketability or other reasons are charged to cost of sales, and totaled $26.6 million, $52.2 million and $41.9 million for the years ended December 31, 2020, 2019 and 2018, respectively.
Divestiture of Hillerød, Denmark Manufacturing Operations
In August 2019 we completed the sale of all of the outstanding shares of our subsidiary that owned our biologics manufacturing operations in Hillerød, Denmark to FUJIFILM. This transaction included the sale of $14.0 million of work in process inventory.
In addition, we sold to FUJIFILM approximately $41.8 million of raw materials that were remaining at the Hillerød facility on the closing date of this transaction. These materials were sold at cost, which approximates fair value.
For additional information on the divestiture of our Hillerød, Denmark manufacturing operations, please read Note 3, Divestitures, to these consolidated financial statements.