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Earnings (loss) per share
 3 Months Ended
Mar. 31, 2018
Earnings Per Share [Abstract]  
Earnings (loss) per share
Earnings (loss) per share
Basic earnings (loss) per share ("EPS") amounts are calculated by dividing net income (loss) allocated to common stockholders by the weighted average number of common shares outstanding during the period. Diluted EPS amounts assume the issuance of common stock for all dilutive securities.
The following table shows the basic and diluted earnings (loss) per share:
 
For the three months ended March 31,
 
2018
 
2017
 
Loss
 
Shares (in millions)
 
Per Share
 
Loss
 
Shares (in millions)
 
Per Share
Net loss
$
(0.3
)
 
 
 
 
 
$
(15.1
)
 
 
 
 
Amount allocated to common stockholders
100.00
%
 
 
 
 
 
100.00
%
 
 
 
 
Basic EPS:
 
 
 
 
 
 
 
 
 
 
 
Net loss allocated to common stockholders
$
(0.3
)
 
87.6

 
$0.00
 
$
(15.1
)
 
87.3

 
$
(0.17
)
Effect of Dilutive Securities:
 
 
 
 
 
 
 
 
 
 
 
Share-based compensation
—

 
—

 
 
 
—

 
—

 
 
Diluted EPS:
 
 
 
 
 
 
 
 
 
 
 
Net loss allocated to common stockholders with assumed conversion
$
(0.3
)
 
87.6

 
$0.00
 
$
(15.1
)
 
87.3

 
$
(0.17
)

 
Three months ended March 31,
Securities excluded from the calculation of diluted EPS (in millions):
2018
 
2017
Share-based compensation(1)
1.4

 
1.2


(1) In periods when we report a net loss, all share-based compensation awards are excluded from the calculation of diluted weighted average shares outstanding because of their antidilutive effect on earnings (loss) per share.