Earnings 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		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Numerator:
Net income available to common shareholders	[1]	$ 3.1	$ 18.3	$ 27.7	$ 34.2
Denominator – Weighted-average common shares outstanding (in thousands):
Basic		16,072	15,974	16,050	15,957
Add: dilutive effect of non-vested common shares, restricted stock units and performance shares	[2]	326	109	271	133
Diluted		16,398	16,083	16,321	16,090
Net income per common share, Basic:		$ 0.19	$ 1.14	$ 1.72	$ 2.14
Net income per common share, Diluted:		$ 0.19	$ 1.14	$ 1.69	$ 2.12

[1] Represents Net income less 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. During the quarter and six months ended June 30, 2024, approximately 170 and 370 shares, respectively, were excluded from the weighted-average diluted shares computation as their inclusion would have been anti‑dilutive. For the quarter and six months ended June 30, 2023, approximately 42,000 and 16,000 shares, respectively, were excluded from the weighted-average diluted shares computation as their inclusion would have been anti‑dilutive.