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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2018
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following sets forth basic and diluted (loss) earnings per common share available to IPG common stockholders.
 
Three months ended
March 31,
 
2018
 
2017
Net (loss) income available to IPG common stockholders
$
(14.1
)
 
$
24.7

 
 
 
 
Weighted-average number of common shares outstanding - basic
383.4

 
391.7

       Dilutive effect of stock options and restricted shares
N/A

 
7.6

Weighted-average number of common shares outstanding - diluted
383.4

 
399.3

 
 
 
 
(Loss) earnings per share available to IPG common stockholders:
 
 
 
       Basic
$
(0.04
)
 
$
0.06

       Diluted
$
(0.04
)
 
$
0.06


Shares outstanding and loss per share are equal on a basic and diluted basis for the three months ended March 31, 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 5.2 were excluded from the diluted loss per share calculation for the three months ended March 31, 2018