Inventory (Tables)

9 Months Ended

Sep. 30, 2015

Inventory Disclosure [Abstract]

Components of inventory

The components of inventory are summarized as follows:

(In millions)	As of September 30, 2015		As of December 31, 2014
Raw materials	$	221.5	$	128.3
Work in process	537.7		511.5
Finished goods	159.7		164.2
Total inventory	$	918.9	$	804.0