Net Income Per Share and Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2019

Earnings Per Share [Abstract]

Calculation of basic and diluted earnings per share

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

	Year Ended December 31,
	2019		2018		2017
Numerator:
Net income	$	62.0	$	91.7	$	45.4
Denominator – Weighted-average common shares outstanding (in thousands):
Basic	15,997		16,585		16,996
Add: dilutive effect of non-vested common shares, restricted stock units and performance shares1	206		289		263
Diluted	16,203		16,874		17,259
Net income per common share, Basic:	$	3.88	$	5.53	$	2.67
Net income per common share, Diluted:	$	3.83	$	5.43	$	2.63

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^1. 

A total of 52,000 non-vested RSAs, RSUs and performance shares for the year ended December 31, 2017 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.