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Earnings per share (Tables)
 3 Months Ended
Mar. 31, 2019
Earnings Per Share [Abstract]  
Basic and Diluted Net Income per Share
The following table presents the calculation of basic and diluted net income per share:
(in millions, except share and per share data)
 
Three Months Ended March 31,
 
2019
 
2018
Numerator:
 
 
 
 
Net loss
 
$
(26.0
)
 
$
(4.9
)
 
 
 
 
 
Denominator:
 
 
 
 
Weighted-average number of shares—basic
 
51.2

 
49.6

Dilutive securities—equity awards
 
—

 
—

Weighted-average number of shares—diluted
 
51.2

 
49.6

 
 
 
 
 
Net loss per share - basic
 
$
(0.51
)
 
$
(0.10
)
Net loss per share - diluted
 
$
(0.51
)
 
$
(0.10
)