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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2015
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,
 
2015
 
2014
 
2015
 
2014
Net income available to IPG common stockholders - basic and diluted
$
121.2

 
$
99.4

 
$
119.4

 
$
78.5

 
 
 
 
 
 
 
 
Weighted-average number of common shares outstanding - basic
410.5

 
421.1

 
410.8

 
421.9

Add: Effect of dilutive securities
 
 
 
 
 
 
 
Restricted stock, stock options and other equity awards
7.1

 
7.0

 
6.8

 
6.6

Weighted-average number of common shares outstanding - diluted
417.6

 
428.1

 
417.6

 
428.5

 
 
 
 
 
 
 
 
Earnings per share available to IPG common stockholders - basic
$
0.30

 
$
0.24

 
$
0.29

 
$
0.19

Earnings per share available to IPG common stockholders - diluted
$
0.29

 
$
0.23

 
$
0.29

 
$
0.18