FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)

12 Months Ended

Dec. 31, 2022

Fair Value Disclosures [Abstract]

Schedule of fair value of assets and liabilities

The following tables provide information about our financial assets measured and reported at fair value as of December 31, 2022 and 2021:

	2022
	Level 1		Level 2		Level 3		Total Fair Value
	(dollars in millions)
Assets
Fixed maturities:
U.S. Treasury securities and agencies	$	9.2	$	1.8	$	—	$	11.0
Municipal securities	—		20.2		—		20.2
Corporate debt securities	—		57.8		—		57.8
Residential mortgage-backed securities	—		5.2		—		5.2
Commercial mortgage-backed securities	—		23.2		—		23.2
Other debt obligations	—		11.0		—		11.0
Total fixed maturities	9.2		119.2		—		128.4
Short-term investments	—		0.4		—		0.4
Cash equivalents	487.3		—		—		487.3
Total assets at fair value	$	496.5	$	119.6	$	—	$	616.1
	2021
	Level 1		Level 2		Level 3		Total Fair Value
	(dollars in millions)
Assets
Fixed maturities:
U.S. Treasury securities and agencies	$	22.6	$	0.7	$	—	$	23.3
Municipal securities	—		20.6		—		20.6
Corporate debt securities	—		48.7		—		48.7
Residential mortgage-backed securities	—		3.5		—		3.5
Commercial mortgage-backed securities	—		30.3		—		30.3
Other debt obligations	—		3.5		—		3.5
Total fixed maturities	22.6		107.3		—		129.9
Cash equivalents	127.0		—		—		127.0
Total assets at fair value	$	149.6	$	107.3	$	—	$	256.9

Schedule of carrying amounts and fair values of financial instruments

As of December 31, 2022 and 2021, the carrying amounts and fair values of these financial instruments were as follows:

	Carrying amount as of December 31, 2022		Estimated Fair Value as of December 31, 2022		Carrying amount as of December 31, 2021		Estimated Fair Value as of December 31, 2021
	(dollars in millions)
Long-term debt	$	295.4	$	309.7	$	—	$	—