Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Numerator:
Net income	$ 56.6	$ 116.6	$ 108.1
Denominator:
Weighted average shares outstanding - basic (in shares)	18.6	18.8	18.7
Effect of dilutive shares (in shares)	0.1	0.2	0.2
Weighted average shares outstanding - diluted (in shares)	18.7	19.0	18.9
Basic earnings per share (in dollars per share)	$ 3.04	$ 6.21	$ 5.77
Diluted earnings per share (in dollars per share)	$ 3.03	$ 6.15	$ 5.73