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Net Income Per Share (Tables)
 3 Months Ended
Mar. 31, 2021
Earnings Per Share [Abstract]  
Schedule of Calculation of Basic and Diluted Net Income Per Share

The following table sets forth the computation of basic and diluted net income per share (in millions of dollars, except share and per share amounts):

 

 

Quarter Ended March 31,

 

 

 

2021

 

 

2020

 

Numerator:

 

 

 

 

 

 

 

 

Net income

 

$

4.5

 

 

$

29.1

 

Denominator – Weighted-average common shares outstanding (in thousands):

 

 

 

 

 

 

 

 

Basic

 

 

15,805

 

 

 

15,838

 

Add: dilutive effect of non-vested common shares, restricted stock units and performance shares1

 

 

182

 

 

 

170

 

Diluted

 

 

15,987

 

 

 

16,008

 

 

 

 

 

 

 

 

 

 

Net income per common share, Basic:

 

$

0.28

 

 

$

1.83

 

Net income per common share, Diluted:

 

$

0.28

 

 

$

1.81

 

 

1

Quantities in the following discussion are denoted in whole shares. During the quarters ended March 31, 2021 and March 31, 2020, approximately 22,000 shares and 2,000 shares, respectively, were excluded from the weighted-average diluted shares computation as their inclusion would have been anti-dilutive.