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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2016
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following sets forth basic and diluted earnings per common share available to IPG common stockholders.
 
Three months ended
June 30,
 
Six months ended
June 30,
 
2016
 
2015
 
2016
 
2015
Net income available to IPG common stockholders
$
156.9

 
$
121.2

 
$
162.3

 
$
119.4

 
 
 
 
 
 
 
 
Weighted-average number of common shares outstanding - basic
400.1

 
410.5

 
400.4

 
410.8

Add: Effect of dilutive securities
 
 
 
 
 
 
 
       Restricted stock, stock options and other equity awards
9.7

 
7.1

 
9.0

 
6.8

Weighted-average number of common shares outstanding - diluted
409.8

 
417.6

 
409.4

 
417.6

 
 
 
 
 
 
 
 
Earnings per share available to IPG common stockholders:
 
 
 
 
 
 
 
       Basic
$
0.39

 
$
0.30

 
$
0.41

 
$
0.29

       Diluted
$
0.38

 
$
0.29

 
$
0.40

 
$
0.29