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Supplementary Data Share Repurchase Program (Tables)
 9 Months Ended
Sep. 30, 2015
Equity [Abstract]  
Share Repurchase Activity
The following table presents our share repurchase activity under our share repurchase programs for the nine months ended September 30, 2015 and 2014.
 
Nine months ended
September 30,
 
2015
 
2014
Number of shares repurchased
8.5

 
8.3

Aggregate cost, including fees
$
172.3

 
$
148.1

Average price per share, including fees
$
20.36

 
$
17.91