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Earnings Per Share (Notes)
 9 Months Ended
Sep. 30, 2016
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,
 
2016
 
2015
 
2016
 
2015
Net income available to IPG common stockholders
$
128.6

 
$
74.9

 
$
290.9

 
$
194.3

 
 
 
 
 
 
 
 
Weighted-average number of common shares outstanding - basic
397.7

 
407.6

 
399.5

 
409.7

Add: Effect of dilutive securities
 
 
 
 
 
 
 
       Restricted stock, stock options and other equity awards
10.2

 
7.9

 
9.3

 
7.3

Weighted-average number of common shares outstanding - diluted
407.9

 
415.5

 
408.8

 
417.0

 
 
 
 
 
 
 
 
Earnings per share available to IPG common stockholders:
 
 
 
 
 
 
 
       Basic
$
0.32

 
$
0.18

 
$
0.73

 
$
0.47

       Diluted
$
0.32

 
$
0.18

 
$
0.71

 
$
0.47


As part of the adoption of Financial Accounting Standards Board (the “FASB”) Accounting Standards Update 2016-09, our excess tax benefit is no longer included in our calculation of diluted shares under the treasury stock method, resulting in an increase of 1.6 shares in the effect of dilutive securities for the three and nine months ended September 30, 2016.