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Earnings Per Share (Notes)
 6 Months Ended
Jun. 30, 2020
Earnings Per Share [Abstract]  
Earnings Per Share [Text Block]  (Loss) Earnings Per Share
The following sets forth basic and diluted (loss) earnings per common share available to IPG common stockholders.
 
Three months ended
June 30,
 
Six Months Ended
June 30,
 
2020
 
2019
 
2020
 
2019
Net (loss) income available to IPG common stockholders
$
(45.6
)
 
$
169.5

 
$
(40.9
)
 
$
161.5

 
 
 
 
 
 
 
 
Weighted-average number of common shares outstanding - basic
389.4

 
386.2

 
388.5

 
385.4

       Dilutive effect of stock options and restricted shares
N/A

 
5.0

 
N/A

 
4.7

Weighted-average number of common shares outstanding - diluted
389.4

 
391.2

 
388.5

 
390.1

 
 
 
 
 
 
 
 
(Loss) earnings per share available to IPG common stockholders:
 
 
 
 
 
 
 
       Basic
$
(0.12
)
 
$
0.44

 
$
(0.11
)
 
$
0.42

       Diluted
$
(0.12
)
 
$
0.43

 
$
(0.11
)
 
$
0.41


Weighted-average number of common shares outstanding and loss per share available to IPG common stockholders are equal on a basic and diluted basis for the three and six months ended June 30, 2020, respectively, because our potentially dilutive securities are anti-dilutive as a result of the net loss available to IPG common stockholders. The potential dilutive effect of stock options and restricted shares on basic weighted-average number of common shares outstanding totaling 2.9 and 3.3 was excluded from the diluted loss per share calculation for the three and six months ended June 30, 2020, respectively.