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Earnings per share (Tables)
 9 Months Ended
Sep. 30, 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:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
2019
 
2018
 
2019
 
2018
Numerator:
 

 
 
 
 
 
 
Net earnings
$
43.2

 
$
20.9

 
$
7.6

 
$
66.2

 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Weighted-average number of shares—basic
51.6

 
50.1

 
51.4

 
49.9

Dilutive securities—equity awards
0.7

 
1.4

 
0.9

 
1.3

Weighted-average number of shares—diluted
52.3

 
51.5

 
52.3

 
51.2

 
 
 
 
 
 
 
 
Net earnings per share - basic
$
0.84

 
$
0.42

 
$
0.15

 
$
1.33

Net earnings per share - diluted
$
0.83

 
$
0.41

 
$
0.15

 
$
1.29