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Inventory (Tables)
6 Months Ended
Jun. 30, 2013
Inventory Disclosure [Abstract]  
Components of inventories
(In millions)
As of
June 30,
2013
 
As of
December 31,
2012
Raw materials
$
110.1

 
$
101.8

Work in process
347.2

 
230.5

Finished goods
113.1

 
115.1

Total inventory
$
570.4

 
$
447.4