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Earnings Per Share
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Earnings Per Share
Earnings Per Share
The following table sets forth the computation of basic and diluted net earnings per share (dollars and shares in millions, except per share amounts):
 
Year Ended December 31,
 
2019
 
2018
 
2017
Earnings
 
 
 
 
 
Net income
$
57.7

 
$
45.5

 
$
33.5

Shares
 
 
 
 
 
Weighted-average common shares outstanding (basic shares)
45.7

 
46.0

 
46.3

Adjustment for assumed dilution:
 
 
 
 
 
Restricted stock units
0.2

 
0.1

 
0.1

Performance shares
0.1

 
—

 
—

Weighted-average shares assuming dilution (diluted shares)
46.0

 
46.1

 
46.4

Earnings per share
 
 
 
 
 
Basic(1)
$
1.26

 
$
0.99

 
$
0.72

Diluted(1)
$
1.25

 
$
0.99

 
$
0.72

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(1)
Basic and diluted earnings per share (“EPS”) are calculated based on unrounded actual amounts.