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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
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.