Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows provided by (used in) operating activities:
Net income (loss)	$ (66.0)	$ 122.0
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Amortization and depreciation	15.0	28.5
Share-based payments expense	6.4	6.4
Deferred income tax benefit, net	(2.6)	(14.4)
Net investment and other (gains) losses	119.6	(32.5)
Undistributed earnings from alternative investment portfolio	(21.8)	(74.8)
Loss on disposals of long-lived assets, net	(0.6)	1.7
Foreign currency exchange (gains) losses	(16.5)	4.4
Impairment of goodwill and intangibles	28.5	0.0
Change in:
Accrued investment income	(2.2)	0.9
Receivables	(274.2)	30.2
Deferred acquisition costs	(17.3)	(12.0)
Ceded unearned premiums	40.4	2.3
Reserves for losses and loss adjustment expenses	334.6	36.5
Unearned premiums	(2.9)	77.3
Ceded reinsurance payable and funds held	(32.1)	(176.3)
Income taxes	1.0	(1.0)
Accrued underwriting expenses and other liabilities	(11.6)	42.5
Other, net	1.8	(0.9)
Cash provided by operating activities	99.5	40.8
Cash flows provided by (used in) investing activities:
Sales of fixed maturity investments	678.3	786.4
Maturities and mandatory calls of fixed maturity investments	323.8	591.1
Sales of equity securities	16.3	36.9
Sales of other investments	45.3	81.1
Purchases of fixed maturity investments	(1,042.1)	(1,511.9)
Purchases of equity securities	(1.0)	(5.3)
Purchases of other investments	(36.2)	(40.1)
Change in foreign regulatory deposits and voluntary pools	(4.0)	36.2
Purchase of mortgage loans	(158.8)	0.0
Change in short-term investments	82.2	32.3
Settlements of foreign currency exchange forward contracts	(21.5)	(9.7)
Proceeds from business divestitures, net of cash transferred	13.9	0.0
Purchases of fixed assets, net	(2.3)	16.0
Other, net	0.0	37.6
Cash provided by (used in) investing activities	(106.1)	50.6
Cash flows provided by (used in) financing activities:
Activity under stock incentive plans	2.1	1.2
Payment of cash dividends to preferred shareholders	(7.9)	(7.9)
Payment of cash dividends to common shareholders	(32.5)	(32.7)
Cash used in financing activities	(38.3)	(39.4)
Effect of exchange rate changes on cash	(1.8)	1.2
Change in cash	(46.7)	53.2
Cash, beginning of year	146.1	148.8
Cash, end of period	$ 99.4	$ 202.0