Statements of Comprehensive Income - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income		$ 1.6	$ 2.0	$ 2.9
Other comprehensive income (loss):
Change in unrealized gains on securities, net of taxes of $(0.3) million, $0.3 million, and $0.1 million, respectively	[1]	1.0	(1.1)	(0.2)
Total other comprehensive income (loss)		1.0	(1.1)	(0.2)
Total comprehensive income		$ 2.6	$ 0.9	$ 2.7

[1] Includes changes in other-than-temporary impairment losses recognized in other comprehensive income.