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Earnings Per Share (Notes)
 3 Months Ended
Mar. 31, 2019
Earnings Per Share [Abstract]  
Earnings Per Share [Text Block]
 Loss Per Share
The following sets forth basic and diluted loss per common share available to IPG common stockholders.
 
Three months ended
March 31,
 
2019
 
2018
Net loss available to IPG common stockholders
$
(8.0
)
 
$
(14.1
)
 
 
 
 
Weighted-average number of common shares outstanding - basic
384.5

 
383.4

       Dilutive effect of stock options and restricted shares
N/A

 
N/A

Weighted-average number of common shares outstanding - diluted
384.5

 
383.4

 
 
 
 
Loss per share available to IPG common stockholders:
 
 
 
       Basic
$
(0.02
)
 
$
(0.04
)
       Diluted
$
(0.02
)
 
$
(0.04
)

Shares outstanding and loss per share are equal on a basic and diluted basis for the three months ended March 31, 2019 and 2018 because our potentially dilutive securities are antidilutive as a result of the net loss available to IPG common stockholders. Potential shares of restricted stock and stock options totaling 4.4 and 5.2 were excluded from the diluted loss per share calculation for the three months ended March 31, 2019 and 2018, respectively.