Net Income Per Share and Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 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):

	Quarter Ended				Six Months Ended
	June 30,				June 30,
	2019		2018		2019		2018
Numerator:
Net income	$	19.2	$	20.7	$	47.2	$	46.4
Denominator – Weighted-average common shares outstanding (in thousands):
Basic	16,063		16,685		16,085		16,696
Add: dilutive effect of non-vested common shares, restricted stock units and performance shares1	177		220		213		266
Diluted	16,240		16,905		16,298		16,962
Net income per common share, Basic:	$	1.19	$	1.24	$	2.93	$	2.78
Net income per common share, Diluted:	$	1.18	$	1.22	$	2.89	$	2.74

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During the quarter and six months ended June 30, 2019, a total of nine thousand and five thousand securities were excluded, respectfully, from the weighted-average diluted shares computation as their inclusion would have been anti-dilutive. During the quarter and six months ended June 30, 2018, a total of two thousand and one thousand securities were excluded, respectfully, from the weighted-average diluted shares computation as their inclusion would have been anti-dilutive.