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Inventory (Tables)
6 Months Ended
Jun. 30, 2021
Inventory Disclosure [Abstract]  
Components of inventory
The components of inventory are summarized as follows:
(In millions)As of June 30, 2021As of December 31, 2020
Raw materials$328.0 $314.9 
Work in process723.0 544.5 
Finished goods203.8 209.2 
Total inventory$1,254.8 $1,068.6