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Stock Repurchase Plan (Tables)
12 Months Ended
Dec. 31, 2015
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)

 
2013  495,085  $50.49  $70.0 
2014    $  $70.0 
2015    $  $70.0