Net Income Per Share - Schedule of Calculation of Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Numerator:
Net income	$ 8.1	$ 4.5
Denominator – Weighted-average common shares outstanding (in thousands):
Basic	15,866	15,805
Add: dilutive effect of non-vested common shares, restricted stock units and performance shares	172	182
Diluted	16,038	15,987
Net income per common share, Basic:	$ 0.51	$ 0.28
Net income per common share, Diluted:	$ 0.51	$ 0.28