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Earnings (loss) per share (Tables)
 3 Months Ended
Mar. 31, 2018
Earnings Per Share [Abstract]  
Basic and diluted earnings (loss) per share
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
)
Securities excluded from the calculation of diluted EPS
 
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.