Inventory (Tables)

3 Months Ended

Mar. 31, 2014

Inventory Disclosure [Abstract]

Components of inventories

The components of inventory are summarized as follows:

(In millions)	As of March 31, 2014		As of December 31, 2013
Raw materials	$	122.7	$	115.0
Work in process	421.2		435.4
Finished goods	128.9		108.6
Total inventory	$	672.8	$	659.0