Redeemable Noncontrolling Interests in Subsidiaries - Changes in Redeemable Noncontrolling Interest in Subsidiaries (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Increase (Decrease) in Temporary Equity [Roll Forward]
Balance, beginning of period	$ 61,821	$ 63,202	$ 236,987
Net Income (Loss)	5,801	(4,932)	2,015
Other Comprehensive Income (Loss), net of tax	585	(2,329)	(7,443)
Subscriptions—Redeemable Noncontrolling Interest Holders	72,823	55,171	998,965
Consolidation/(Deconsolidation)	(75,225)	(435)	(985,248)
Stock Award Activity		707	9,410
Distributions to Noncontrolling Interests in Subsidiaries	(39,960)	(25,979)	(4,926)
Acquisition of Additional Equity of FHL		(37,805)	(167,302)
Change in Estimated Redemption Value of Redeemable Noncontrolling Interests		14,221	(19,256)
Balance, end of period	25,845	61,821	63,202
Consolidated Investment Companies
Increase (Decrease) in Temporary Equity [Roll Forward]
Balance, beginning of period	50,317	24,659	24,246
Net Income (Loss)	5,311	(6,320)	304
Other Comprehensive Income (Loss), net of tax	(8)
Subscriptions—Redeemable Noncontrolling Interest Holders	72,463	53,040	997,556
Consolidation/(Deconsolidation)	(75,225)	(435)	(994,430)
Distributions to Noncontrolling Interests in Subsidiaries	(38,517)	(20,627)	(3,017)
Balance, end of period	14,341	50,317	24,659
FHL and other entities
Increase (Decrease) in Temporary Equity [Roll Forward]
Balance, beginning of period	11,504	38,543	212,741
Net Income (Loss)	490	1,388	1,711
Other Comprehensive Income (Loss), net of tax	593	(2,329)	(7,443)
Subscriptions—Redeemable Noncontrolling Interest Holders	360	2,131	1,409
Consolidation/(Deconsolidation)			9,182
Stock Award Activity		707	9,410
Distributions to Noncontrolling Interests in Subsidiaries	(1,443)	(5,352)	(1,909)
Acquisition of Additional Equity of FHL		(37,805)	(167,302)
Change in Estimated Redemption Value of Redeemable Noncontrolling Interests		14,221	(19,256)
Balance, end of period	$ 11,504	$ 11,504	$ 38,543