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Inventory (Tables)
9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Components of inventory
The components of inventory are summarized as follows:
(In millions)As of September 30, 2020As of December 31, 2019
Raw materials$288.4 $169.7 
Work in process539.9 460.0 
Finished goods199.4 174.5 
Total inventory$1,027.7 $804.2