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Net loss per share (Tables)
 3 Months Ended
Mar. 31, 2020
Earnings Per Share [Abstract]  
Basic and Diluted Net Income per Share
The following table presents the calculation of basic and diluted net loss per share:
 
Three Months Ended March 31,
2020
 
2019
Numerator:
 

 
 
Net loss
$
(12.5
)
 
$
(26.0
)
 
 
 
 
Denominator:
 
 
 
Weighted-average number of shares—basic
52.0

 
51.2

Dilutive securities—equity awards
—

 
—

Weighted-average number of shares—diluted
52.0

 
51.2

 
 
 
 
Net loss per share - basic
$
(0.24
)
 
$
(0.51
)
Net loss per share - diluted
$
(0.24
)
 
$
(0.51
)