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Earnings (loss) per share (Tables)
 9 Months Ended
Sep. 30, 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 September 30,
 
2018
 
2017
 
Loss
 
Shares (in millions)
 
Per Share
 
Income
 
Shares (in millions)
 
Per Share
Net income (loss)
$
(20.3
)
 
 
 
 
 
$
20.8

 
 
 
 
Amount allocated to common stockholders
100.0
%
 
 
 
 
 
92.06
%
 
 
 
 
Basic EPS:
 
 
 
 
 
 
 
 
 
 
 
Net income (loss) allocated to common stockholders
$
(20.3
)
 
87.6

 
$
(0.23
)
 
$
19.1

 
87.3

 
$
0.22

Effect of Dilutive Securities:
 
 
 
 
 
 
 
 
 
 
 
Share-based compensation
—

 
—

 
 
 
—

 
0.9

 
 
Diluted EPS:
 
 
 
 
 
 
 
 
 
 
 
Net income (loss) allocated to common stockholders with assumed conversion
$
(20.3
)
 
87.6

 
$
(0.23
)
 
$
19.1

 
88.3

 
$
0.22

 
 
 
 
 
 
 
 
 
 
 
 
 
For the nine months ended September 30,
 
2018
 
2017
 
Loss
 
Shares (in millions)
 
Per Share
 
Income
 
Shares
(in millions)
 
Per Share
Net income (loss)
$
(1.2
)
 
 
 
 
 
$
12.8

 
 
 
 
Amount allocated to common stockholders
100.0
%
 
 
 
 
 
92.04
%
 
 
 
 
Basic EPS:
 
 
 
 
 
 
 
 
 
 
 
Net income (loss) allocated to common stockholders
$
(1.2
)
 
87.6

 
$
(0.01
)
 
$
11.8

 
87.3

 
$
0.13

Effect of Dilutive Securities:
 
 
 
 
 
 
 
 
 
 
 
Share-based compensation
—

 
—

 
 
 
—

 
0.8

 
 
Diluted EPS:
 
 
 
 
 
 
 
 
 
 
 
Net income (loss) allocated to common stockholders with assumed conversion
$
(1.2
)
 
87.6

 
$
(0.01
)
 
$
11.8

 
88.1

 
$
0.13
Securities excluded from the calculation of diluted EPS
 
Three months ended September 30,
 
Nine months ended September 30,
Securities excluded from the calculation of diluted EPS (in millions):
2018(1)
 
2017
 
2018(1)
 
2017
Share-based compensation
1.3

 
0.5

 
1.4

 
0.5


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