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, 2023	Mar. 31, 2022
Numerator:
Net income	$ 15.9	$ 8.1
Denominator – Weighted-average common shares outstanding (in thousands):
Basic	15,940	15,866
Add: dilutive effect of non-vested common shares, restricted stock units and performance shares	156	172
Diluted	16,096	16,038
Net income per common share, Basic:	$ 1.00	$ 0.51
Net income per common share, Diluted:	$ 0.99	$ 0.51