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Inventory (Tables)
3 Months Ended
Mar. 31, 2013
Inventory Disclosure [Abstract]  
Components of inventories
(In millions)
As of
March 31,
2013
 
As of
December 31,
2012
Raw materials
$
109.8

 
$
101.8

Work in process
276.1

 
230.5

Finished goods
120.7

 
115.1

Total inventory
$
506.6

 
$
447.4