INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Unpaid losses and loss adjustment expenses	$ 1.9	$ 2.5
Unearned premium reserves	2.7	3.8
Nondeductible accruals	0.4	0.5
Deferred rent	1.5	2.0
Research and development credits	0.9	0.9
Disallowed interest carryforward	16.5	9.6
Bad debt expense	0.7	1.2
Excess ceding commission	2.8	2.2
Deferred compensation	6.1	2.5
Stock and warrant compensation	9.5	5.4
Unrealized losses	1.4	0.0
Other	0.1	2.6
State net operating loss carryforward	17.4	10.2
Net operating loss carryforward	266.4	217.4
Gross deferred assets	328.3	260.8
Less valuation allowance	(322.3)	(255.0)
Total deferred tax assets, less valuation allowance	6.0	5.8
Deferred tax liabilities:
Internally developed software	2.0	2.7
Fixed assets	1.3	2.2
Deferred acquisition costs	1.5	0.6
Unrealized gains	0.0	0.1
Other	1.2	0.2
Deferred tax liabilities	6.0	5.8
Net deferred tax asset	$ 0.0	$ 0.0