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Inventory (Tables)
9 Months Ended
Sep. 30, 2014
Inventory Disclosure [Abstract]  
Components of inventory
The components of inventory are summarized as follows:
(In millions)
As of
September 30,
2014
 
As of
December 31,
2013
Raw materials
$
133.8

 
$
115.0

Work in process
478.6

 
435.4

Finished goods
140.7

 
108.6

Total inventory
$
753.1

 
$
659.0