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Stock Repurchase Plan (Tables)
 12 Months Ended
Dec. 31, 2012
Stock Repurchase Plan [Abstract]  
Schedule of stock repurchase activity
 
   
Number of  shares
repurchased
    
Average price paid
per share
    
Amount available for
future repurchases
(in millions)
  
2010
     687,340     $ 168.06     $ 107.7  
2011
     1,581,444     $ 128.15     $ 80.0  
2012
     484,841     $ 51.56     $ 95.0