CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Cash flows from operating activities:
Net loss	$ (62.4)	$ (47.3)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	4.5	5.0
Stock-based compensation	10.3	14.9
Amortization of premium on bonds	(1.5)	(1.3)
Provision for bad debt	4.5	3.2
Changes in operating assets and liabilities:
Premium receivable	(21.1)	(18.3)
Reinsurance recoverable	(11.9)	(31.7)
Prepaid reinsurance premium	(9.9)	(8.2)
Deferred acquisition costs	0.8	(1.0)
Other assets	2.8	22.7
Unpaid loss and loss adjustment expense	9.2	1.7
Unearned premium	21.2	17.6
Trade payables	(1.1)	0.0
Funds held for reinsurance treaties	5.5	3.6
Deferred ceding commissions	(4.6)	4.9
Ceded premium payable	2.4	3.4
Other liabilities and accrued expenses	4.1	1.0
Net cash used in operating activities	(47.2)	(29.8)
Cash flows from investing activities:
Proceeds from short-term investments sold or matured	9.4	29.3
Proceeds from bonds sold or matured	30.2	58.7
Cost of short-term investments acquired	(2.0)	(5.4)
Cost of bonds acquired	(75.6)	(49.2)
Purchases of property and equipment	(2.3)	(2.5)
Net cash (used in) provided by investing activities	(40.3)	30.9
Cash flows from financing activities:
Proceeds from borrowings under financing agreement	30.0	17.5
Payments on borrowings under financing agreement	(11.5)	(4.1)
Proceeds from stock exercises	1.5	0.1
Net cash provided by financing activities	20.0	13.5
Effect of exchange rate changes on cash, cash equivalents and restricted cash	1.5	(0.9)
Net (decrease) increase in cash, cash equivalents and restricted cash	(66.0)	13.7
Cash, cash equivalents and restricted cash at beginning of period	385.7	271.5
Cash, cash equivalents and restricted cash at end of period	319.7	285.2
Supplemental disclosure of cash flow information:
Cash paid for income taxes	0.3	0.3
Cash paid for interest expense on borrowings under financing agreement	$ 3.1	$ 0.5