Net Income Per Share (Tables)

12 Months Ended

Dec. 31, 2020

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):

	Year Ended December 31,
	2020		2019		2018
Numerator:
Net income	$	28.8	$	62.0	$	91.7
Denominator – Weighted-average common shares    outstanding (in thousands):
Basic		15,802		15,997		16,585
Add: dilutive effect of non-vested common shares,    restricted stock units and performance shares1		111		206		289
Diluted		15,913		16,203		16,874
Net income per common share, Basic:	$	1.82	$	3.88	$	5.53
Net income per common share, Diluted:	$	1.81	$	3.83	$	5.43

^1. A total of 44,000 non-vested RSAs, RSUs and performance shares for the year ended December 31, 2020 were excluded from the weighted-average diluted shares computation as their inclusion would have been anti-dilutive. None were excluded for the years ended December 31, 2019 and December 31, 2018.