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Earnings Per Share
 6 Months Ended
Jun. 30, 2020
Earnings Per Share [Abstract]  
Earnings Per Share Earnings Per Share
Diluted net earnings per share includes the effect of unvested restricted stock awards. The following table sets forth the computation of basic and diluted net earnings per share (in millions, except per share amounts):
 
Three months ended June 30,
 
Six months ended June 30,
 
2020
 
2019
 
2020
 
2019
Basic:
 
 
 
 
 
 
 
Net earnings
$
39.1

 
$
32.6

 
$
89.2

 
$
58.6

Shares used for basic net earnings per share:
 
 
 
 
 
 
 
Weighted average shares of common stock outstanding
149.2

 
147.7

 
148.6

 
147.6

Basic net earnings per share
$
0.26

 
$
0.22

 
$
0.60

 
$
0.40

 
 
 
 
 
 
 
 
Diluted:
 
 
 
 
 
 
 
Net earnings
$
39.1

 
$
32.6

 
$
89.2

 
$
58.6

Shares used for diluted net earnings per share:
 
 
 
 
 
 
 
Weighted average shares of common stock outstanding
149.2

 
147.7

 
148.6

 
147.6

Dilutive effect of unvested restricted shares of common stock
0.8

 
0.8

 
0.7

 
0.8

Weighted average shares of common stock, diluted
150.0

 
148.5

 
149.3

 
148.4

Diluted net earnings per share
$
0.26

 
$
0.22

 
$
0.60

 
$
0.39