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Loss Per Share (Tables)
 3 Months Ended
Mar. 31, 2013
Earnings Per Share [Abstract]  
Schedule of Loss Per Share, Basic and Diluted
The following sets forth basic and diluted loss per common share available to IPG common stockholders.
 
Three months ended
March 31,
 
2013
 
2012
Net loss available to IPG common stockholders
$
(59.2
)
 
$
(45.9
)
Weighted-average number of common shares outstanding - basic and diluted
414.2

 
437.6

Loss per share available to IPG common stockholders - basic and diluted
$
(0.14
)
 
$
(0.10
)
Schedule of Antidilutive Securities Excluded from Computation of Loss Per Share
 
Three months ended
March 31,
 
2013
 
2012
Restricted stock, stock options and other equity awards
5.7

 
6.3

4.75% Notes 1
13.4

 
16.5

4.25% Notes 1
0.0

 
30.9

Preferred stock outstanding
17.1

 
16.7

Total
36.2

 
70.4

 
 
 
 
Securities excluded from the diluted loss per share calculation
because the exercise price was greater than the average market price:
 
 
 
Stock options 2
3.2

 
7.2

 
1 
We retired all of our outstanding 4.75% Notes and 4.25% Notes in March 2013 and March 2012, respectively. See Note 2 for further information on our 4.75% Notes. For purposes of calculating diluted loss per share, the potentially dilutive shares are pro-rated based on the period they were outstanding.
2 
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.