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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2015
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
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,
 
2015
 
2014
 
2015
 
2014
Net income available to IPG common stockholders - basic and diluted
$
74.9

 
$
89.7

 
$
194.3

 
$
168.2

 
 
 
 
 
 
 
 
Weighted-average number of common shares outstanding - basic
407.6

 
419.2

 
409.7

 
421.0

Add: Effect of dilutive securities
 
 
 
 
 
 
 
Restricted stock, stock options and other equity awards
7.9

 
7.2

 
7.3

 
6.2

Weighted-average number of common shares outstanding - diluted
415.5

 
426.4

 
417.0

 
427.2

 
 
 
 
 
 
 
 
Earnings per share available to IPG common stockholders - basic
$
0.18

 
$
0.21

 
$
0.47

 
$
0.40

Earnings per share available to IPG common stockholders - diluted
$
0.18

 
$
0.21

 
$
0.47

 
$
0.39