CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Cash flows from operations:
Net income (loss)	$ 1,201.8	$ 284.1	$ 580.9
Adjustments to reconcile net income to net cash provided from (used for) operations:
Net realized and unrealized investment (gains) losses	(361.5)	(184.9)	(434.2)
Net gain on sale of the Bamboo Group	(849.3)	0.0	0.0
Change in fair value of Ark’s contingent consideration	173.0	61.3	48.7
Change in fair value of BAM Surplus Notes	37.5	(0.5)	0.0
Unrealized loss on deconsolidation of BAM	0.0	114.5	0.0
Deferred income tax expense (benefit)	92.1	11.1	(46.9)
Amortization of restricted share awards	18.5	16.3	15.3
Amortization (accretion) and depreciation	9.0	(6.4)	(17.8)
Other operating items:
Net change in reinsurance recoverables	(247.1)	(147.0)	153.3
Net change in insurance premiums, commissions and fees receivable	(91.4)	(204.7)	(67.0)
Net change in deferred acquisition costs	(56.2)	(27.1)	(22.2)
Net change in loss and loss adjustment expense reserves	367.7	543.0	308.6
Net change in unearned insurance premiums	172.7	174.4	147.9
Net change in reinsurance payable	136.7	68.4	(170.0)
Net change in premiums and commissions payable	27.0	38.9	0.0
Net change in accrued incentive compensation from Other Operations	22.9	(8.4)	1.6
Contributions to Kudu’s Participation Contracts	(195.1)	(103.5)	(163.8)
Proceeds from Kudu’s Participation Contracts sold	21.6	9.4	75.2
Net other operating activities	89.6	(42.1)	(5.5)
Net cash provided from (used for) operations	550.5	586.8	404.1
Cash flows from investing activities:
Net change in short-term investments	(872.2)	548.4	(495.8)
Sales of fixed maturity investments	607.4	429.5	195.1
Maturities, calls and paydowns of fixed maturity investments	390.5	416.5	266.5
Sales of common equity securities and investment in MediaAlpha	251.0	162.4	261.6
Distributions and redemptions of other long-term investments	117.3	195.7	116.9
Proceeds from the sale of Bamboo Group, NSM Group and Other Operating Businesses, net of cash sold of $135.0, $0.0 and $0.8	746.5	0.0	17.3
Purchases of consolidated subsidiaries, net of cash acquired of $1.9, $44.9 and $0.0	(349.5)	(231.8)	0.0
Release of cash (pre-funding) of investment purchases	(30.0)	0.0	70.0
Purchases of fixed maturity investments	(1,235.2)	(1,677.5)	(592.7)
Purchases of common equity securities and investment in MediaAlpha	(30.6)	(121.1)	(114.2)
Purchases of other long-term investments	(286.2)	(190.2)	(265.2)
Payments of principal received on the BAM Surplus Notes subsequent to deconsolidation	24.2	16.2	0.0
Impact to cash from deconsolidation of BAM	0.0	(4.2)	0.0
Net other investing activities	(0.1)	9.1	(3.4)
Net cash provided from (used for) investing activities	(666.9)	(447.0)	(543.9)
Cash flows from financing activities:
Draw down of debt and revolving lines of credit	294.7	36.6	12.4
Repayment of debt and revolving lines of credit	(17.5)	(38.1)	(25.7)
Cash dividends paid to common shareholders	(2.6)	(2.5)	(2.6)
Repurchases and retirements of common shares	(202.6)	(7.9)	(32.7)
BAM member surplus contributions prior to deconsolidation	0.0	26.0	72.8
Contributions from other noncontrolling interests	0.7	1.0	9.0
Distributions to other noncontrolling interests	(64.7)	(21.1)	(12.0)
Net other financing activities	27.6	10.2	(14.0)
Net cash provided from (used for) financing activities	35.6	4.2	7.2
Net change in cash during the period	(80.8)	144.0	(132.6)
Cash balance at beginning of year	266.4	122.4	255.0
Cash balance at end of year	185.6	266.4	122.4
Operating Segments | HG Global
Adjustments to reconcile net income to net cash provided from (used for) operations:
Interest income from BAM Surplus Notes subsequent to deconsolidation, net of interest payments received of $10.8 and $5.8	(19.0)	(10.0)	0.0
Investments, Excluding MediaAlpha
Adjustments to reconcile net income to net cash provided from (used for) operations:
Net realized and unrealized investment (gains) losses	(331.9)	(146.9)	(407.1)
MediaAlpha
Adjustments to reconcile net income to net cash provided from (used for) operations:
Net realized and unrealized investment (gains) losses	$ (29.6)	(38.0)	$ (27.1)
Change in fair value of BAM Surplus Notes		$ (0.5)