Statutory Restrictions on Consolidated Stockholders' Equity and Investments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statutory Restrictions on Consolidated Stockholders' Equity and Investments [Abstract]
Combined capital and surplus on statutory basis	$ 194.0	$ 180.2
Net income statutory basis	21.3	41.0	$ 18.8
Statutory accounting statutory premium and supplemental reserves	37.3	35.9
Amount available for dividend distribution with approval from regulatory agencies	103.5	81.8
Statutory accounting practices, statutory amount available for dividend payments	20.4
Investments on deposit with state insurance departments	$ 7.1	$ 6.7