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Inventory
6 Months Ended
Jun. 30, 2011
Inventory [Abstract]  
Inventory
6.   Inventory
 
The components of inventory are summarized as follows:
 
                 
    As of
    As of
 
    June 30,
    December 31,
 
(In millions)   2011     2010  
 
Raw materials
  $ 59.8     $ 59.0  
Work in process
    165.6       142.2  
Finished goods
    82.9       87.9  
                 
Total inventory
  $ 308.3     $ 289.1