Inventory (Tables)

6 Months Ended

Jun. 30, 2015

Inventory Disclosure [Abstract]

Components of inventory

The components of inventory are summarized as follows:

(In millions)	As of June 30, 2015		As of December 31, 2014
Raw materials	$	173.2	$	128.3
Work in process	516.7		511.5
Finished goods	175.8		164.2
Total inventory	$	865.7	$	804.0