Inventory

The components of inventory are summarized as follows:



(In millions)	As of March 31, 2018		As of December 31, 2017
Raw materials	$	164.3	$	162.4
Work in process	594.3		605.7
Finished goods	148.0		157.4
Total inventory	$	906.6	$	925.5

Balance Sheet Classification:
Inventory	$	890.8	$	902.7
Investments and other assets	15.8		22.8
Total inventory	$	906.6	$	925.5

Long-term inventory, which primarily consists of work in process, is included in investments and other assets in our condensed consolidated balance sheets.