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Inventory
9 Months Ended
Sep. 30, 2011
Inventory [Abstract] 
Inventory
6.   Inventory
 
The components of inventory are summarized as follows:
 
                 
    As of
 		    As of
 		 
    September 30,
 		    December 31,
 		 
(In millions)   2011     2010  
 
Raw materials
  $ 63.6     $ 59.0  
Work in process
    169.0       142.2  
Finished goods
    78.3       87.9  
                 
Total inventory
  $ 310.9     $ 289.1