Consolidated Statements of Cash Flows - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows provided by (used in) operating activities:
Net income (loss)		$ (175.2)	$ 6.7	$ (54.1)
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Amortization and depreciation		18.5	43.4	33.2
Share-based payments expense		9.6	8.0	8.7
Deferred income tax benefit, net		15.4	(38.6)	(21.6)
Net investment and other (gains) losses		115.3	(32.6)	3.6
Undistributed earnings from alternative investment portfolio		(17.7)	(95.5)	(8.6)
Loss on disposals of long-lived assets, net		0.6	23.3	5.5
Impairment of goodwill and intangibles		28.5	43.2	0.0
Change in:
Accrued investment income		0.2	0.8	3.9
Receivables		(193.6)	47.4	84.8
Deferred acquisition costs		(12.6)	0.8	(4.6)
Ceded unearned premiums		88.4	65.7	(33.2)
Reserves for losses and loss adjustment expenses		446.2	210.8	280.2
Unearned premiums		(74.7)	7.2	63.7
Ceded reinsurance payable and funds held		(162.9)	(207.3)	(238.2)
Income taxes		(47.5)	(4.5)	(17.5)
Accrued underwriting expenses and other liabilities		14.7	3.0	(43.7)
Other, net		0.0	17.9	9.8
Net cash flows from operating activities		53.2	99.7	71.9
Cash flows provided by (used in) investing activities:
Sales of fixed maturity investments		818.5	992.9	1,080.0
Maturities and mandatory calls of fixed maturity investments		380.1	717.7	569.8
Sales of equity securities		17.8	125.8	25.4
Sales of other investments		58.1	212.3	103.9
Purchases of fixed maturity investments		(1,093.6)	(1,932.9)	(2,038.1)
Purchases of equity securities		(1.0)	(5.3)	(78.9)
Purchases of other investments		(52.8)	(47.4)	(35.5)
Change in foreign regulatory deposits and voluntary pools		(6.7)	(27.1)	(5.4)
Purchase of mortgage loans		(159.9)	0.0	0.0
Change in short-term investments		26.1	(116.4)	285.4
Settlements of foreign currency exchange forward contracts		(22.0)	(1.2)	9.4
Proceeds from business divestitures, net of cash transferred		14.9	0.0	28.3
Proceeds from sale of Trident assets		0.0	0.0	38.0
Purchases of fixed assets, net		(6.1)	18.0	(20.2)
Other, net		0.0	7.7	13.6
Cash used in investing activities		(26.6)	(55.9)	(24.3)
Cash flows provided by (used in) financing activities:
Payment of long-term debt		0.0	0.0	(125.0)
Issuance of preferred shares, net of issuance costs		0.0	0.0	144.0
Activity under stock incentive plans		1.8	1.3	1.8
Payment of cash dividends to preferred shareholders		(10.5)	(10.5)	(4.6)
Payment of cash dividends to common shareholders		(43.4)	(43.7)	(43.0)
Cash used in financing activities		(52.1)	(52.9)	(26.8)
Effect of exchange rate changes on cash		0.4	6.4	(9.8)
Net change in cash and restricted cash including balances classified as held-for-sale		(25.1)	(2.7)	11.0
Cash	[1]	(70.8)	0.0	0.0
Cash and restricted cash, beginning of year		146.1	148.8	137.8
Cash and restricted cash, end of period		$ 50.2	$ 146.1	$ 148.8

[1] See Note 2 for details of the assets and liabilities classified as “held-for-sale” as of December 31, 2022.