CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net loss	$ (47.3)	$ (65.8)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	5.0	5.1
Stock-based compensation	14.9	15.4
Amortization of (premium) discount on bonds	(1.3)	0.2
Provision for bad debt	3.2	2.3
Changes in operating assets and liabilities:
Premium receivable	(18.3)	(7.7)
Reinsurance recoverable	(31.7)	3.1
Prepaid reinsurance premium	(8.2)	4.7
Deferred acquisition costs	(1.0)	0.0
Other assets	22.7	0.7
Unpaid loss and loss adjustment expense	1.7	(11.0)
Unearned premium	17.6	9.8
Trade payables	0.0	0.8
Funds held for reinsurance treaties	3.6	(6.9)
Deferred ceding commissions	4.9	(0.2)
Ceded premium payable	3.4	2.5
Other liabilities and accrued expenses	1.0	0.6
Net cash used in operating activities	(29.8)	(46.4)
Cash flows from investing activities:
Proceeds from short-term investments sold or matured	29.3	36.6
Proceeds from bonds sold or matured	58.7	106.9
Cost of short-term investments acquired	(5.4)	(23.2)
Cost of bonds acquired	(49.2)	(102.3)
Purchases of property and equipment	(2.5)	(2.7)
Net cash provided by investing activities	30.9	15.3
Cash flows from financing activities:
Proceeds from borrowings under financing agreement	17.5	0.0
Payments on borrowings under financing agreement	(4.1)	0.0
Proceeds from stock exercises	0.1	0.1
Net cash provided by financing activities	13.5	0.1
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(0.9)	(0.7)
Net increase (decrease) in cash, cash equivalents and restricted cash	13.7	(31.7)
Cash, cash equivalents and restricted cash at beginning of period	271.5	286.5
Cash, cash equivalents and restricted cash at end of period	285.2	254.8
Supplemental disclosure of cash flow information:
Cash paid for income taxes	0.3	0.2
Cash paid for interest expense on borrowings under financing agreement	$ 0.5	$ 0.0