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Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2011
Intangible Assets [Abstract]  
Intangible Assets
Intangible assets, which are included in Other assets, consist of the following:
              
(In millions)
 
At December 31,
 
   
2011
  
2010
 
   
Amortizing
  
Non-amortizing
  
Amortizing
  
Non-amortizing
 
Customer-related assets
 $20.6  $-  $7.4  $- 
Market-related assets
  3.6   7.0   -   7.0 
  Intangible assets, net
 $24.2  $7.0  $7.4  $7.0