Inventory (Tables)

6 Months Ended

Jun. 30, 2020

Inventory Disclosure [Abstract]

Components of inventory

The components of inventory are summarized as follows:

(In millions)	As of June 30, 2020		As of December 31, 2019
Raw materials	$	244.7	$	169.7
Work in process	509.1		460.0
Finished goods	198.9		174.5
Total inventory	$	952.7	$	804.2