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Earnings Per Share (Notes)
 3 Months Ended
Mar. 31, 2020
Earnings Per Share [Abstract]  
Earnings Per Share [Text Block]  Earnings Per Share
The following sets forth basic and diluted earnings (loss) per common share available to IPG common stockholders.
 
Three months ended
March 31,
 
2020
 
2019
Net income (loss) available to IPG common stockholders
$
4.7

 
$
(8.0
)
 
 
 
 
Weighted-average number of common shares outstanding - basic
387.7

 
384.5

       Dilutive effect of stock options and restricted shares
4.0

 
N/A

Weighted-average number of common shares outstanding - diluted
391.7

 
384.5

 
 
 
 
Earnings (loss) per share available to IPG common stockholders:
 
 
 
       Basic
$
0.01

 
$
(0.02
)
       Diluted
$
0.01

 
$
(0.02
)