Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows provided by (used in) operating activities:
Net income (loss)	$ (17.2)	$ 99.6
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Amortization and depreciation	11.0	14.8
Share-based payments expense	2.6	4.5
Deferred income tax benefit, net	8.8	(6.8)
Net investment and other (gains) losses	74.9	(37.8)
Undistributed earnings from alternative investment portfolio	(17.7)	(50.6)
Loss on disposals of long-lived assets, net	(0.6)	1.7
Foreign currency exchange (gains) losses	(7.4)	5.7
Change in:
Accrued investment income	(1.3)	1.1
Receivables	(160.5)	151.3
Deferred acquisition costs	(8.1)	(4.4)
Ceded unearned premiums	10.7	(15.0)
Reserves for losses and loss adjustment expenses	195.5	(170.9)
Unearned premiums	(23.5)	6.6
Ceded reinsurance payable and funds held	(30.8)	(22.5)
Income taxes	8.6	8.5
Accrued underwriting expenses and other liabilities	18.2	23.8
Other, net	(31.3)	(22.1)
Cash provided by (used in) operating activities	31.9	(12.5)
Cash flows provided by (used in) investing activities:
Sales of fixed maturity investments	576.4	616.4
Maturities and mandatory calls of fixed maturity investments	256.0	394.8
Sales of equity securities	12.9	33.5
Sales of other investments	32.4	62.3
Purchases of fixed maturity investments	(864.4)	(983.3)
Purchases of equity securities	(1.0)	(1.8)
Purchases of other investments	(23.5)	(31.5)
Change in foreign regulatory deposits and voluntary pools	1.5	35.9
Purchase of mortgage loans	(157.5)	0.0
Change in short-term investments	188.0	12.5
Settlements of foreign currency exchange forward contracts	(19.1)	(8.8)
Proceeds from business divestitures, net of cash transferred	13.1	0.0
Purchases of fixed assets, net	(0.4)	(13.3)
Other, net	0.0	(37.6)
Cash provided by investing activities	14.4	79.1
Cash flows provided by (used in) financing activities:
Activity under stock incentive plans	1.3	0.8
Payment of cash dividends to preferred shareholders	(5.3)	(5.3)
Payment of cash dividends to common shareholders	(21.3)	(21.9)
Cash used in financing activities	(25.3)	(26.4)
Effect of exchange rate changes on cash	(2.0)	1.7
Change in cash	19.0	41.9
Cash, beginning of year	146.1	148.8
Cash, end of period	$ 165.1	$ 190.7