Background and Basis of Presentation - EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Basic Common Share
Income from continuing operations	$ 5.7	$ 8.3
Amounts attributable to participating securities	0.0	0.0
Net income available to common stockholders	$ 5.7	$ 8.3
Weighted-average basic shares outstanding (in shares)	16,808	16,835
Basic earnings per share (in dollars per share)	$ 0.34	$ 0.49
Earnings Per Diluted Common Share
Income from continuing operations	$ 5.7	$ 8.3
Amounts attributable to participating securities	(0.1)	(0.1)
Net income available to common stockholders	$ 5.6	$ 8.2
Weighted-average basic shares outstanding (in shares)	16,808	16,835
Add: Assumed incremental shares under stock compensation plans (in shares)	44	38
Weighted-average diluted shares (in shares)	16,852	16,873
Diluted earnings per share (in dollars per share)	$ 0.34	$ 0.49
Potentially dilutive stock-based compensation awards excluded from computation of dilutive common shares (in shares)	343	324