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Inventory (Tables)
9 Months Ended
Sep. 30, 2021
Inventory Disclosure [Abstract]  
Components of inventory
The components of inventory are summarized as follows:
(In millions)As of September 30, 2021As of December 31, 2020
Raw materials$366.0 $314.9 
Work in process780.8 544.5 
Finished goods201.1 209.2 
Total inventory$1,347.9 $1,068.6