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Earnings Per Share (Notes)
 6 Months Ended
Jun. 30, 2018
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,
 
2018
 
2017
 
2018
 
2017
Net income available to IPG common stockholders
$
145.8

 
$
107.7

 
$
131.7

 
$
132.4

 
 
 
 
 
 
 
 
Weighted-average number of common shares outstanding - basic
383.6

 
392.3

 
383.5

 
392.0

       Dilutive effect of stock options and restricted shares
5.9

 
8.0

 
5.4

 
7.6

Weighted-average number of common shares outstanding - diluted
389.5

 
400.3

 
388.9

 
399.6

 
 
 
 
 
 
 
 
Earnings per share available to IPG common stockholders:
 
 
 
 
 
 
 
       Basic
$
0.38

 
$
0.27

 
$
0.34

 
$
0.34

       Diluted
$
0.37

 
$
0.27

 
$
0.34

 
$
0.33