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, 2024	Mar. 31, 2023
Numerator:
Net income available to common shareholders	[1]	$ 24.6	$ 15.9
Denominator – Weighted-average common shares outstanding (in thousands):
Basic		16,027	15,940
Add: dilutive effect of non-vested common shares, restricted stock units and performance shares	[2]	203	156
Diluted		16,230	16,096
Net income per common share, Basic:		$ 1.53	$ 1
Net income per common share, Diluted:		$ 1.51	$ 0.99

[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 quarters ended March 31, 2024 and March 31, 2023, approximately 2,200 and 11,000 shares, respectively, were excluded from the weighted-average diluted shares computation as their inclusion would have been anti‑dilutive.