CONDENSED CONSOLIDATED STATEMENTS OF INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Premiums and other revenue:
Net earned premiums	$ 234.3	$ 342.7	$ 837.9	$ 1,062.5
Net investment income	62.3	40.4	187.1	102.9
Net investment and other gains (losses):
Net realized investment and other (losses) gains	0.8	7.4	5.8	(21.0)
Change in fair value recognized	0.0	(10.1)	26.4	2.1
Change in allowance for credit losses on fixed maturity securities	(1.0)	(2.0)	(1.4)	(2.1)
Total net investment and other gains (losses)	(0.2)	(4.7)	30.8	(21.0)
Total revenue	296.4	378.4	1,055.8	1,144.4
Expenses:
Losses and loss adjustment expenses	346.8	280.9	793.5	806.9
Underwriting, acquisition and general expenses	110.9	116.1	344.8	364.0
Non-operating expenses (income)	(0.2)	5.1	12.7	23.5
Interest expense	9.4	8.7	29.2	25.4
Fee and other expense (income), net	0.0	0.2	(0.1)	(0.3)
Foreign currency exchange (gains) losses	(3.8)	(3.3)	(3.1)	0.1
Total expenses	463.1	407.7	1,177.0	1,219.6
Income (loss) before income taxes	(166.7)	(29.3)	(121.2)	(75.2)
Income tax provision (benefit)	(34.4)	17.6	(27.2)	3.3
Net income (loss)	(132.3)	(46.9)	(94.0)	(78.5)
Dividends on Series A Preferred stock	2.6	2.6	7.9	7.9
Net income (loss) attributable to common stockholders	(134.9)	(49.5)	(101.9)	(86.4)
Net income (loss) attributable to common stockholders	$ (134.9)	$ (49.5)	$ (101.9)	$ (86.4)
Net income (loss) attributable to common stockholders per share of common stock:
Basic (in dollars per share)		$ (1.41)		$ (2.46)
Diluted (in dollars per share)		(1.41)		(2.46)
Dividend declared per common share (in dollars per share)		$ 0		$ 0
Weighted average common stock:
Basic (in shares)		35,197,824		35,158,416
Diluted (in shares)		35,197,824		35,158,416