Net investment income (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Insurance Solutions
Net Investment Income [Line Items]
Gross investment income	$ 16,044	$ 16,708	$ 33,699	$ 34,467
Investment expense	(775)	(30)	(1,754)	(2,838)
Net investment income	18,476	20,514	38,696	39,363
Consolidated Entity, Excluding Consolidated VIE
Net Investment Income [Line Items]
Net investment income	15,269	16,678	31,945	31,629
Consolidated Entity, Excluding Consolidated VIE \| Insurance Solutions
Net Investment Income [Line Items]
Net investment income	15,269	16,678	31,945	31,629
Variable Interest Entity, Primary Beneficiary \| Insurance Solutions
Net Investment Income [Line Items]
Gross investment income	3,618	4,075	7,365	8,109
Investment expense	(411)	(239)	(614)	(375)
Net investment income	3,207	3,836	6,751	7,734
Debt securities \| Insurance Solutions
Net Investment Income [Line Items]
Gross investment income	10,285	9,571	21,269	22,605
Corporate loans \| Insurance Solutions
Net Investment Income [Line Items]
Gross investment income	2,274	(2,481)	5,391	(782)
Derivative income (expense) \| Insurance Solutions
Net Investment Income [Line Items]
Derivative income (expense)	(32)	7,216	(90)	6,780
Mortgage loans \| Insurance Solutions
Net Investment Income [Line Items]
Gross investment income	3,197	1,908	5,787	4,734
Equity securities \| Insurance Solutions
Net Investment Income [Line Items]
Gross investment income	103	217	244	393
Other \| Insurance Solutions
Net Investment Income [Line Items]
Gross investment income	$ 217	$ 277	$ 1,098	$ 737

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Amount, before investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

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