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Earnings Per Share (Notes)
 9 Months Ended
Sep. 30, 2014
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,
 
2014
 
2013
 
2014
 
2013
Net income available to IPG common stockholders - basic and diluted
$
89.7

 
$
45.4

 
$
168.2

 
$
66.1


 
 
 
 
 
 
 
 
Weighted-average number of common shares outstanding - basic
419.2
 
419.7

 
421.0
 
419.7

Add: Effect of dilutive securities
 
 
 
 
 
 
 
Restricted stock, stock options and other equity awards
7.2
 
6.4
 
6.2
 
5.1
Weighted-average number of common shares outstanding - diluted
426.4
 
426.1

 
427.2
 
424.8

 
 
 
 
 
 
 
 
Earnings per share available to IPG common stockholders - basic
$
0.21

 
$
0.11

 
$
0.40

 
$
0.16

Earnings per share available to IPG common stockholders - diluted
$
0.21

 
$
0.11

 
$
0.39

 
$
0.16



The following table presents the potential shares excluded from the diluted earnings per share calculation because the effect of including these potential shares would be antidilutive.
 
Three months ended
September 30,
 
Nine months ended
September 30,
 
2014
 
2013
 
2014
 
2013
4.75% Notes 1
0.0
 
0.0
 
0.0
 
4.4
Preferred stock 2
0.0
 
17.3
 
0.0
 
17.3
Total
0.0

 
17.3

 
0.0

 
21.7

 
 
 
 
 
 
 
 
Securities excluded from the diluted earnings per share calculation
because the exercise price was greater than the average market price:
 
 
 
 
 
 
 
Stock options 3
0.0

 
0.0

 
0.0

 
0.2

 
1 
We retired all of our outstanding 4.75% Convertible Senior Notes due 2023 (the "4.75% Notes") in March 2013. For purposes of calculating diluted earnings per share, the potentially dilutive shares are pro-rated based on the period they were outstanding but were antidilutive.
2 
We converted all of our 5 1/4% Series B Cumulative Convertible Perpetual Preferred Stock into common stock in October 2013.
3 
These options are outstanding at the end of the respective periods. In any period in which the exercise price is less than the average market price, these options have the potential to be dilutive, and application of the treasury stock method would reduce this amount.