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Treasury Stock (Tables)
 3 Months Ended
Mar. 31, 2015
Equity [Abstract]  
Share Repurchases
The following table summarizes the share repurchases under the 2014 Program and the 2012 Program:
 
2014 Program
 
2012 Program
 
Shares
 
Amounts
 
Shares
 
Amounts
 
(in millions)
Shares repurchased as of December 31, 2013
—

 
$
—

 
7.3

 
$
1,449.3

Shares repurchased in 2014:
 
 
 
 
 
 
 
First quarter
—

 
$
—

 
3.2

 
$
793.9

Second quarter
—

 
—

 
3.1

 
756.8

Third quarter
—

 
—

 
—

 
—

Fourth quarter
1.4

 
372.8

 
—

 
—

Total shares repurchased in 2014
1.4

 
372.8

 
6.3

 
1,550.7

Shares repurchased as of December 31, 2014 
1.4

 
$
372.8

 
13.6

 
$
3,000.0

Shares repurchased in 2015:
 
 
 
 
 
 
 
First quarter
0.8

 
$
236.6

 
 
 
 
Shares repurchased as of March 31, 2015
2.2

 
$
609.4