Net (Loss) Income Per Share (Tables)

12 Months Ended

Dec. 31, 2021

Earnings Per Share [Abstract]

Schedule of Calculation of Basic and Diluted Net (Loss) Income Per Share

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

	Year Ended December 31,
	2021			2020		2019
Numerator:
Net (loss) income	$	(18.5	)	$	28.8	$	62.0
Denominator – Weighted-average common shares    outstanding (in thousands):
Basic		15,836			15,802		15,997
Add: dilutive effect of non-vested common shares,    restricted stock units and performance shares1		—			111		206
Diluted		15,836			15,913		16,203
Net (loss) income per common share, Basic:	$	(1.17	)	$	1.82	$	3.88
Net (loss) income per common share, Diluted:	$	(1.17	)	$	1.81	$	3.83

^1. Quantities in the following discussion are denoted in whole shares. For the year ended December 31, 2021, approximately 213,000 potentially dilutive shares were excluded from the computation of net loss per share as their effect would have been anti‑dilutive. 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. No shares were excluded for the year ended December 31, 2019.