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Inventory (Tables)
3 Months Ended
Mar. 31, 2022
Inventory Disclosure [Abstract]  
Components of inventory
The components of inventory are summarized as follows:
(In millions)As of March 31, 2022As of December 31, 2021
Raw materials$354.5 $349.6 
Work in process655.6 814.0 
Finished goods205.3 187.9 
Total inventory$1,215.4 $1,351.5