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Supplementary Data Share Repurchase Program (Tables)
 6 Months Ended
Jun. 30, 2015
Equity [Abstract]  
Share Repurchase Activity
The following table presents our share repurchase activity under our share repurchase programs for the six months ended June 30, 2015 and 2014.
 
Six months ended
June 30,
 
2015
 
2014
Number of shares repurchased
4.9

 
5.6

Aggregate cost, including fees
$
102.0

 
$
97.3

Average price per share, including fees
$
20.87

 
$
17.51