Investments - Finance Receivable Allowance Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Asset Management
Financing Receivable, Allowance for Credit Loss
Beginning balance	$ 299	$ 299
Charge-offs	0	0
Recoveries	0	0
Provision for credit losses	(4)	0
Ending balance	295	299
Insurance Solutions
Financing Receivable, Allowance for Credit Loss
Beginning balance	10,982	7,053
Charge-offs	0	0
Recoveries	0	0
Provision for credit losses	(4,538)	(40)
Ending balance	6,444	7,013
Insurance Solutions | Commercial real estate mortgage loans
Financing Receivable, Allowance for Credit Loss
Beginning balance	2,355	2,615
Provision for credit losses	(1,402)	1
Ending balance	953	2,616
Insurance Solutions | Multi-family mortgage loans
Financing Receivable, Allowance for Credit Loss
Beginning balance	7,681	3,360
Provision for credit losses	(3,005)	(11)
Ending balance	4,676	3,349
Insurance Solutions | Corporate loans
Financing Receivable, Allowance for Credit Loss
Beginning balance	946	1,078
Provision for credit losses	(131)	(30)
Ending balance	$ 815	$ 1,048