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Earnings Per Share (Notes)
 9 Months Ended
Sep. 30, 2019
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,
 
2019
 
2018
 
2019
 
2018
Net income available to IPG common stockholders
$
165.6

 
$
161.0

 
$
327.1

 
$
292.7

 
 
 
 
 
 
 
 
Weighted-average number of common shares outstanding - basic
386.7

 
382.6

 
385.8

 
383.2

       Dilutive effect of stock options and restricted shares
5.1

 
5.8

 
4.5

 
5.2

Weighted-average number of common shares outstanding - diluted
391.8

 
388.4

 
390.3

 
388.4

 
 
 
 
 
 
 
 
Earnings per share available to IPG common stockholders:
 
 
 
 
 
 
 
       Basic
$
0.43

 
$
0.42

 
$
0.85

 
$
0.76

       Diluted
$
0.42

 
$
0.41

 
$
0.84

 
$
0.75