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Earnings Per Share (Notes)
 9 Months Ended
Sep. 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
September 30,
 
Nine months ended
September 30,
 
2018
 
2017
 
2018
 
2017
Net income available to IPG common stockholders
$
161.0

 
$
169.7

 
$
292.7

 
$
302.1

 
 
 
 
 
 
 
 
Weighted-average number of common shares outstanding - basic
382.6

 
389.5

 
383.2

 
391.2

       Dilutive effect of stock options and restricted shares
5.8

 
7.7

 
5.2

 
7.4

Weighted-average number of common shares outstanding - diluted
388.4

 
397.2

 
388.4

 
398.6

 
 
 
 
 
 
 
 
Earnings per share available to IPG common stockholders:
 
 
 
 
 
 
 
       Basic
$
0.42

 
$
0.44

 
$
0.76

 
$
0.77

       Diluted
$
0.41

 
$
0.43

 
$
0.75

 
$
0.76