Inventory (Tables)

3 Months Ended

Mar. 31, 2019

Inventory Disclosure [Abstract]

Components of inventory

The components of inventory are summarized as follows:

(In millions)	As of March 31, 2019		As of December 31, 2018
Raw materials	$	199.7	$	196.3
Work in process	462.3		606.7
Finished goods	108.2		133.5
Total inventory	$	770.2	$	936.5
Balance Sheet Classification:
Inventory	$	770.2	$	929.9
Investments and other assets	—		6.6
Total inventory	$	770.2	$	936.5