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Inventory (Tables)
12 Months Ended
Dec. 31, 2020
Inventory Disclosure [Abstract]  
Components of 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