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(Loss) earnings per share (Tables)
 6 Months Ended
Jun. 30, 2019
Earnings Per Share [Abstract]  
Basic and Diluted Net Income 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