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(Loss) earnings per share
 6 Months Ended
Jun. 30, 2019
Earnings Per Share [Abstract]  
(Loss) earnings per share arnings per share
The following table presents the calculation of basic and diluted net (loss) income per share:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
Numerator:
 
 

 
 
 
 
 
 
Net (loss) earnings
 
$
(9.5
)
 
$
50.1

 
$
(35.6
)
 
$
45.2

 
 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
 
Weighted-average number of shares—basic
 
51.5

 
49.9

 
51.3

 
49.7

Dilutive securities—equity awards
 
—

 
1.3

 
—

 
1.3

Weighted-average number of shares—diluted
 
51.5

 
51.2

 
51.3

 
51.0

 
 
 
 
 
 
 
 
 
Net (loss) earnings per share - basic
 
$
(0.18
)
 
$
1.00

 
$
(0.69
)
 
$
0.91

Net (loss) earnings per share - diluted
 
$
(0.18
)
 
$
0.98

 
$
(0.69
)
 
$
0.89


For the three and six months ended June 30, 2019 and 2018, basic earnings per share is computed by dividing net gain/(loss) by the weighted average number of shares of common stock outstanding during the period.
For the three and six months ended June 30, 2019 and 2018, diluted earnings per share is computed using the treasury method by dividing net loss by the weighted average number of shares of common stock outstanding during the period, adjusted for the potential dilutive effect of other securities if such securities were converted or exercised and are not anti-dilutive. No adjustment for the potential dilutive effect of dilutive securities is reported as the effect would have been anti-dilutive for the three and six months ended June 30, 2019 due to the Company's net loss. The share-based awards that were excluded from the calculation of diluted loss per share, because they were anti-dilutive, were 3.0 million for the three and six months ended June 30, 2019.