Condensed Consolidated Statements of Income (Loss) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Premiums and other revenue:
Earned premiums	$ 389.9	$ 480.6
Net investment income	29.7	37.7
Net investment and other gains (losses):
Net realized investment and other gains (losses)	(21.1)	(40.2)
Change in fair value recognized	3.3	6.7
Change in allowance for credit losses on fixed maturity securities	(0.1)	(1.0)
Total net investment and other gains (losses)	(17.9)	(34.5)
Total revenue	401.7	483.8
Expenses:
Losses and loss adjustment expenses	284.6	283.6
Underwriting, acquisition and insurance expenses	137.0	172.9
Non-operating expenses	11.6	7.4
Interest expense	8.5	5.8
Fee and other (income) expense, net	(0.4)	(0.8)
Foreign currency exchange (gains) losses	2.7	2.9
Total expenses	444.0	471.8
Income (loss) before income taxes	(42.3)	12.0
Income tax provision (benefit)	(8.5)	13.0
Net income (loss)	(33.8)	(1.0)
Dividends on preferred shares	2.6	2.6
Net income (loss) attributable to common shareholders	(36.4)	(3.6)
Net Loss attributable to common shareholders, basic	$ (36.4)	$ (3.6)
Net income (loss) attributable to common shareholders per common share:
Basic (in dollars per share)	$ (1.04)	$ (0.11)
Diluted (in dollars per share)	(1.04)	(0.11)
Dividend declared per common share (in dollars per share)	$ 0	$ 0.31
Weighted average common shares:
Basic (in shares)	35,099,968	34,891,935
Diluted (in shares)	35,099,968	34,891,935