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Earnings Per Share (Notes)
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Earnings Per Share [Text Block]
  Earnings Per Share
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,
 
2017
 
2016
 
2017
 
2016
Net income available to IPG common stockholders
$
94.7

 
$
156.9

 
$
116.2

 
$
162.3

 
 
 
 
 
 
 
 
Weighted-average number of common shares outstanding - basic
392.3

 
400.1

 
392.0

 
400.4

Add: Effect of dilutive securities
 
 
 
 
 
 
 
       Restricted stock, stock options and other equity awards
8.0

 
9.7

 
7.6

 
9.0

Weighted-average number of common shares outstanding - diluted
400.3

 
409.8

 
399.6

 
409.4

 
 
 
 
 
 
 
 
Earnings per share available to IPG common stockholders:
 
 
 
 
 
 
 
       Basic
$
0.24

 
$
0.39

 
$
0.30

 
$
0.41

       Diluted
$
0.24

 
$
0.38

 
$
0.29

 
$
0.40