Net Income (Loss) Per Share - Schedule of Calculation of Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Numerator:
Net income (loss)		$ 47.2	$ (29.6)	$ (18.5)
Less: earnings attributable to participating securities	[1]	(0.1)
Net income (loss) available to common shareholders		$ 47.1	$ (29.6)	$ (18.5)
Denominator – Weighted-average common shares outstanding (in thousands):
Basic		15,991	15,906	15,836
Add: dilutive effect of non-vested common shares, restricted stock units and performance shares	[2]	140
Diluted		16,131	15,906	15,836
Net income (loss) per common share, Basic		$ 2.95	$ (1.86)	$ (1.17)
Net income (loss) per common share, Diluted		$ 2.92	$ (1.86)	$ (1.17)

[1] Represents distributed and undistributed earnings allocated to non-vested RSAs that contain non-forfeitable rights to dividends.

[2] Quantities in the following discussion are denoted in whole shares. A total of 35,000 non-vested RSUs and performance shares for the year ended December 31, 2023 were excluded from the weighted-average diluted shares computation as their inclusion would have been anti-dilutive. For the years ended December 31, 2022 and December 31, 2021, approximately 139,000 and 213,000 potentially dilutive shares, respectively, were excluded from the computation of net loss per share as their effect would have been anti‑dilutive.