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Stock Repurchase Plan (Tables)
 12 Months Ended
Dec. 31, 2013
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)
 
2011
 
 
1,581,444
 
 
$
128.15
 
 
$
80.0
 
2012
 
 
484,841
 
 
$
51.56
 
 
$
95.0
 
2013
 
 
495,085
 
 
$
50.49
 
 
$
70.0