Policy Liabilities - Schedule of Liability for Future Policy Benefit, Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	Dec. 31, 2023
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Net liability for future policy benefits—long duration health	$ 18,756,844	$ 18,882,023	$ 18,457,263
Life
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Beginning balance	11,757,317	12,342,307
Beginning balance	11,638,918	11,709,368
Effect of changes in assumptions on future cash flows			0	$ 0
Effect of actual variances from expected experience			(102,139)	(96,776)
Adjusted balance			11,536,779	11,612,592
Issuances	348,404	393,173
Interest accrual	147,819	146,846
Net premiums collected	(331,524)	(333,619)
Effect of changes in the foreign exchange rate	2,105	(8,927)
Ending balance	11,703,583	11,810,065
Effect of change from original to current discount rates	238,542	354,243
Ending balance	11,942,125	12,164,308
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	26,334,284	27,723,158
Beginning balance	25,091,823	24,563,696
Effect of changes in assumptions on future cash flows			0	0
Effect of actual variances from expected experience			(111,920)	(101,981)
Adjusted balance			24,979,903	24,461,715
Issuances	348,403	393,173
Interest accrual	344,775	334,816
Benefit payments	(348,655)	(356,105)
Effect of changes in the foreign exchange rate	4,347	(20,637)
Ending balance	25,328,773	24,812,962
Effect of changes in discount rate assumptions	1,463,699	2,248,980
Ending balance	26,792,472	27,061,942
Net liability for future policy benefits at original discount rates	13,625,190	13,002,897
Effect of changes in discount rate assumptions	1,225,157	1,894,737
Other Adjustments	507	9,339
Net liability for future policy benefits—long duration health	14,850,854	14,906,973
Reinsurance recoverable	(8,122)	(44,521)
Net liability for future policy benefits, after reinsurance recoverable, at current discount rates	14,842,732	14,862,452
Policyholder benefits net of remeasurement gain (losses)	8,525	4,856
Life | Gain Loss From Expereince
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Policyholder benefits net of remeasurement gain (losses)	8,525	4,856
Life | Gain (Loss) From Unlocking Assumptions
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Policyholder benefits net of remeasurement gain (losses)	0	0
Health
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Beginning balance	6,314,148	6,089,728
Beginning balance	6,512,064	6,069,295
Effect of changes in assumptions on future cash flows			0	0
Effect of actual variances from expected experience			(59,132)	(74,899)
Adjusted balance			6,452,932	5,994,396
Issuances	212,145	196,727
Interest accrual	74,924	67,803
Net premiums collected	(152,203)	(137,946)
Effect of changes in the foreign exchange rate	222	(862)
Ending balance	6,588,020	6,120,118
Effect of change from original to current discount rates	(118,389)	(109,582)
Ending balance	6,469,631	6,010,536
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	8,586,253	8,441,002
Beginning balance	9,006,731	8,484,970
Effect of changes in assumptions on future cash flows			0	0
Effect of actual variances from expected experience			(59,201)	(78,518)
Adjusted balance			8,947,530	8,406,452
Issuances	211,709	196,335
Interest accrual	103,346	95,245
Benefit payments	(172,883)	(148,484)
Effect of changes in the foreign exchange rate	352	(1,548)
Ending balance	9,090,054	8,548,000
Effect of changes in discount rate assumptions	(312,587)	(249,298)
Ending balance	8,777,467	8,298,702
Net liability for future policy benefits at original discount rates	2,502,034	2,427,882
Effect of changes in discount rate assumptions	(194,198)	(139,716)
Other Adjustments	53,522	33,734
Net liability for future policy benefits—long duration health	2,361,358	2,321,900
Reinsurance recoverable	(3,499)	(14,897)
Net liability for future policy benefits, after reinsurance recoverable, at current discount rates	2,357,859	2,307,003
Policyholder benefits net of remeasurement gain (losses)	444	3,208
Health | Gain Loss From Expereince
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Policyholder benefits net of remeasurement gain (losses)	444	3,208
Health | Gain (Loss) From Unlocking Assumptions
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Policyholder benefits net of remeasurement gain (losses)	0	0
American Income | Life
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Beginning balance	4,645,917	4,681,888
Beginning balance	4,656,710	4,523,329
Effect of changes in assumptions on future cash flows			0	0
Effect of actual variances from expected experience			(51,617)	(48,248)
Adjusted balance			4,605,093	4,475,081
Issuances	195,634	211,847
Interest accrual	56,466	53,823
Net premiums collected	(139,565)	(135,686)
Effect of changes in the foreign exchange rate	2,105	(8,927)
Ending balance	4,719,733	4,596,138
Effect of change from original to current discount rates	37,311	56,533
Ending balance	4,757,044	4,652,671
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	9,870,692	10,163,627
Beginning balance	9,508,588	9,061,833
Effect of changes in assumptions on future cash flows			0	0
Effect of actual variances from expected experience			(55,814)	(52,221)
Adjusted balance			9,452,774	9,009,612
Issuances	195,633	211,847
Interest accrual	127,459	120,201
Benefit payments	(109,126)	(104,758)
Effect of changes in the foreign exchange rate	4,347	(20,637)
Ending balance	9,671,087	9,216,265
Effect of changes in discount rate assumptions	441,809	741,828
Ending balance	10,112,896	9,958,093
Net liability for future policy benefits at original discount rates	4,951,354	4,620,127
Effect of changes in discount rate assumptions	404,498	685,295
Other Adjustments	224	287
Net liability for future policy benefits—long duration health	5,356,076	5,305,709
Reinsurance recoverable	(186)	(170)
Net liability for future policy benefits, after reinsurance recoverable, at current discount rates	5,355,890	5,305,539
American Income | Life | Gain Loss From Expereince
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Policyholder benefits net of remeasurement gain (losses)	4,179	3,972
American Income | Life | Gain (Loss) From Unlocking Assumptions
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Policyholder benefits net of remeasurement gain (losses)	0	0
American Income | Health
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Beginning balance	223,247	206,381
Beginning balance	225,141	201,869
Effect of changes in assumptions on future cash flows			0	0
Effect of actual variances from expected experience			(4,881)	(3,550)
Adjusted balance			220,260	198,319
Issuances	10,441	9,949
Interest accrual	2,643	2,283
Net premiums collected	(6,714)	(5,839)
Effect of changes in the foreign exchange rate	222	(862)
Ending balance	226,852	203,850
Effect of change from original to current discount rates	421	(55)
Ending balance	227,273	203,795
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	355,303	335,504
Beginning balance	348,711	315,431
Effect of changes in assumptions on future cash flows			0	0
Effect of actual variances from expected experience			(6,195)	(4,002)
Adjusted balance			342,516	311,429
Issuances	10,441	9,949
Interest accrual	4,456	3,937
Benefit payments	(5,320)	(6,402)
Effect of changes in the foreign exchange rate	352	(1,548)
Ending balance	352,445	317,365
Effect of changes in discount rate assumptions	10,095	11,418
Ending balance	362,540	328,783
Net liability for future policy benefits at original discount rates	125,593	113,515
Effect of changes in discount rate assumptions	9,674	11,473
Other Adjustments	699	749
Net liability for future policy benefits—long duration health	135,966	125,737
Reinsurance recoverable	0	0
Net liability for future policy benefits, after reinsurance recoverable, at current discount rates	135,966	125,737
American Income | Health | Gain Loss From Expereince
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Policyholder benefits net of remeasurement gain (losses)	1,249	430
American Income | Health | Gain (Loss) From Unlocking Assumptions
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Policyholder benefits net of remeasurement gain (losses)	0	0
Direct to Consumer | Life
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Beginning balance	5,622,906	6,052,651
Beginning balance	5,504,912	5,664,259
Effect of changes in assumptions on future cash flows			0	0
Effect of actual variances from expected experience			(38,917)	(36,229)
Adjusted balance			5,465,995	5,628,030
Issuances	121,780	149,231
Interest accrual	72,207	73,420
Net premiums collected	(147,711)	(152,631)
Effect of changes in the foreign exchange rate	0	0
Ending balance	5,512,271	5,698,050
Effect of change from original to current discount rates	173,844	247,209
Ending balance	5,686,115	5,945,259
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	9,125,112	9,714,516
Beginning balance	8,660,948	8,656,752
Effect of changes in assumptions on future cash flows			0	0
Effect of actual variances from expected experience			(41,948)	(36,444)
Adjusted balance			8,619,000	8,620,308
Issuances	121,779	149,231
Interest accrual	119,194	117,925
Benefit payments	(150,039)	(159,061)
Effect of changes in the foreign exchange rate	0	0
Ending balance	8,709,934	8,728,403
Effect of changes in discount rate assumptions	543,806	771,812
Ending balance	9,253,740	9,500,215
Net liability for future policy benefits at original discount rates	3,197,663	3,030,353
Effect of changes in discount rate assumptions	369,962	524,603
Other Adjustments	208	3,549
Net liability for future policy benefits—long duration health	3,567,833	3,558,505
Reinsurance recoverable	0	0
Net liability for future policy benefits, after reinsurance recoverable, at current discount rates	3,567,833	3,558,505
Direct to Consumer | Life | Gain Loss From Expereince
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Policyholder benefits net of remeasurement gain (losses)	2,980	166
Direct to Consumer | Life | Gain (Loss) From Unlocking Assumptions
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Policyholder benefits net of remeasurement gain (losses)	0	0
Direct to Consumer | Health
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Beginning balance	133,377	115,363
Beginning balance	131,919	109,880
Effect of changes in assumptions on future cash flows			0	0
Effect of actual variances from expected experience			(1,415)	(2,316)
Adjusted balance			130,504	107,564
Issuances	6,662	4,609
Interest accrual	1,681	1,368
Net premiums collected	(3,435)	(2,678)
Effect of changes in the foreign exchange rate	0	0
Ending balance	135,412	110,863
Effect of change from original to current discount rates	2,971	3,016
Ending balance	138,383	113,879
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	129,277	109,482
Beginning balance	127,975	104,501
Effect of changes in assumptions on future cash flows			0	0
Effect of actual variances from expected experience			(1,191)	(2,321)
Adjusted balance			126,784	102,180
Issuances	6,630	4,598
Interest accrual	1,681	1,368
Benefit payments	(4,273)	(3,096)
Effect of changes in the foreign exchange rate	0	0
Ending balance	130,822	105,050
Effect of changes in discount rate assumptions	2,741	2,725
Ending balance	133,563	107,775
Net liability for future policy benefits at original discount rates	(4,590)	(5,813)
Effect of changes in discount rate assumptions	(230)	(291)
Other Adjustments	5,575	6,838
Net liability for future policy benefits—long duration health	755	734
Reinsurance recoverable	0	0
Net liability for future policy benefits, after reinsurance recoverable, at current discount rates	755	734
Direct to Consumer | Health | Gain Loss From Expereince
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Policyholder benefits net of remeasurement gain (losses)	(4)	20
Direct to Consumer | Health | Gain (Loss) From Unlocking Assumptions
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Policyholder benefits net of remeasurement gain (losses)	0	0
Liberty National | Life
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Beginning balance	1,048,447	1,129,716
Beginning balance	1,047,020	1,077,831
Effect of changes in assumptions on future cash flows			0	0
Effect of actual variances from expected experience			(7,916)	(10,448)
Adjusted balance			1,039,104	1,067,383
Issuances	25,780	26,164
Interest accrual	13,521	13,839
Net premiums collected	(33,262)	(33,901)
Effect of changes in the foreign exchange rate	0	0
Ending balance	1,045,143	1,073,485
Effect of change from original to current discount rates	13,553	28,724
Ending balance	1,058,696	1,102,209
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	3,377,517	3,605,392
Beginning balance	3,340,219	3,338,252
Effect of changes in assumptions on future cash flows			0	0
Effect of actual variances from expected experience			(8,711)	(10,449)
Adjusted balance			3,331,508	3,327,803
Issuances	25,780	26,164
Interest accrual	44,736	44,554
Benefit payments	(54,594)	(58,109)
Effect of changes in the foreign exchange rate	0	0
Ending balance	3,347,430	3,340,412
Effect of changes in discount rate assumptions	68,427	159,330
Ending balance	3,415,857	3,499,742
Net liability for future policy benefits at original discount rates	2,302,287	2,266,927
Effect of changes in discount rate assumptions	54,874	130,606
Other Adjustments	0	5,418
Net liability for future policy benefits—long duration health	2,357,161	2,402,951
Reinsurance recoverable	(7,922)	(7,787)
Net liability for future policy benefits, after reinsurance recoverable, at current discount rates	2,349,239	2,395,164
Liberty National | Life | Gain Loss From Expereince
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Policyholder benefits net of remeasurement gain (losses)	182	112
Liberty National | Life | Gain (Loss) From Unlocking Assumptions
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Policyholder benefits net of remeasurement gain (losses)	0	0
Liberty National | Health
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Beginning balance	337,119	358,472
Beginning balance	338,275	348,570
Effect of changes in assumptions on future cash flows			0	0
Effect of actual variances from expected experience			(10,720)	(11,410)
Adjusted balance			327,555	337,160
Issuances	12,657	13,558
Interest accrual	4,090	4,227
Net premiums collected	(13,120)	(12,780)
Effect of changes in the foreign exchange rate	0	0
Ending balance	331,182	342,165
Effect of change from original to current discount rates	1,749	3,276
Ending balance	332,931	345,441
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	804,695	865,808
Beginning balance	791,141	816,819
Effect of changes in assumptions on future cash flows			0	0
Effect of actual variances from expected experience			(11,005)	(12,821)
Adjusted balance			780,136	803,998
Issuances	12,478	13,349
Interest accrual	10,470	10,833
Benefit payments	(24,422)	(23,864)
Effect of changes in the foreign exchange rate	0	0
Ending balance	778,662	804,316
Effect of changes in discount rate assumptions	20,778	29,690
Ending balance	799,440	834,006
Net liability for future policy benefits at original discount rates	447,480	462,151
Effect of changes in discount rate assumptions	19,029	26,414
Other Adjustments	11,363	11,254
Net liability for future policy benefits—long duration health	477,872	499,819
Reinsurance recoverable	(988)	(1,224)
Net liability for future policy benefits, after reinsurance recoverable, at current discount rates	476,884	498,595
Liberty National | Health | Gain Loss From Expereince
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Policyholder benefits net of remeasurement gain (losses)	1,183	1,211
Liberty National | Health | Gain (Loss) From Unlocking Assumptions
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Policyholder benefits net of remeasurement gain (losses)	0	0
Other premium | Life
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Beginning balance	440,047	478,052
Beginning balance	430,276	443,949
Effect of changes in assumptions on future cash flows			0	0
Effect of actual variances from expected experience			(3,689)	(1,851)
Adjusted balance			426,587	442,098
Issuances	5,210	5,931
Interest accrual	5,625	5,764
Net premiums collected	(10,986)	(11,401)
Effect of changes in the foreign exchange rate	0	0
Ending balance	426,436	442,392
Effect of change from original to current discount rates	13,834	21,777
Ending balance	440,270	464,169
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	3,960,963	4,239,623
Beginning balance	3,582,068	3,506,859
Effect of changes in assumptions on future cash flows			0	0
Effect of actual variances from expected experience			(5,447)	(2,867)
Adjusted balance			3,576,621	3,503,992
Issuances	5,211	5,931
Interest accrual	53,386	52,136
Benefit payments	(34,896)	(34,177)
Effect of changes in the foreign exchange rate	0	0
Ending balance	3,600,322	3,527,882
Effect of changes in discount rate assumptions	409,657	576,010
Ending balance	4,009,979	4,103,892
Net liability for future policy benefits at original discount rates	3,173,886	3,085,490
Effect of changes in discount rate assumptions	395,823	554,233
Other Adjustments	75	85
Net liability for future policy benefits—long duration health	3,569,784	3,639,808
Reinsurance recoverable	(14)	(36,564)
Net liability for future policy benefits, after reinsurance recoverable, at current discount rates	3,569,770	3,603,244
Other premium | Life | Gain Loss From Expereince
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Policyholder benefits net of remeasurement gain (losses)	1,184	606
Other premium | Life | Gain (Loss) From Unlocking Assumptions
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Policyholder benefits net of remeasurement gain (losses)	0	0
United American | Health
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Beginning balance	3,885,530	3,697,771
Beginning balance	3,948,856	3,625,803
Effect of changes in assumptions on future cash flows			0	0
Effect of actual variances from expected experience			(28,215)	(40,531)
Adjusted balance			3,920,641	3,585,272
Issuances	117,625	104,603
Interest accrual	46,870	41,822
Net premiums collected	(79,516)	(70,249)
Effect of changes in the foreign exchange rate	0	0
Ending balance	4,005,620	3,661,448
Effect of change from original to current discount rates	(11,927)	(8,053)
Ending balance	3,993,693	3,653,395
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	3,960,432	3,814,328
Beginning balance	4,026,860	3,741,530
Effect of changes in assumptions on future cash flows			0	0
Effect of actual variances from expected experience			(25,054)	(40,325)
Adjusted balance			4,001,806	3,701,205
Issuances	117,400	104,431
Interest accrual	47,983	43,444
Benefit payments	(100,534)	(82,085)
Effect of changes in the foreign exchange rate	0	0
Ending balance	4,066,655	3,766,995
Effect of changes in discount rate assumptions	(15,333)	(10,461)
Ending balance	4,051,322	3,756,534
Net liability for future policy benefits at original discount rates	61,035	105,547
Effect of changes in discount rate assumptions	(3,406)	(2,408)
Other Adjustments	34,570	14,449
Net liability for future policy benefits—long duration health	92,199	117,588
Reinsurance recoverable	(2,511)	(3,096)
Net liability for future policy benefits, after reinsurance recoverable, at current discount rates	89,688	114,492
United American | Health | Gain Loss From Expereince
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Policyholder benefits net of remeasurement gain (losses)	(3,820)	(336)
United American | Health | Gain (Loss) From Unlocking Assumptions
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Policyholder benefits net of remeasurement gain (losses)	0	0
Family Heritage | Health
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Beginning balance	1,734,875	1,711,741
Beginning balance	1,867,873	1,783,173
Effect of changes in assumptions on future cash flows			0	0
Effect of actual variances from expected experience			(13,901)	(17,092)
Adjusted balance			1,853,972	1,766,081
Issuances	64,760	64,008
Interest accrual	19,640	18,103
Net premiums collected	(49,418)	(46,400)
Effect of changes in the foreign exchange rate	0	0
Ending balance	1,888,954	1,801,792
Effect of change from original to current discount rates	(111,603)	(107,766)
Ending balance	1,777,351	1,694,026
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Beginning balance	3,336,546	3,315,880
Beginning balance	3,712,044	3,506,689
Effect of changes in assumptions on future cash flows			0	0
Effect of actual variances from expected experience			(15,756)	(19,049)
Adjusted balance			$ 3,696,288	$ 3,487,640
Issuances	64,760	64,008
Interest accrual	38,756	35,663
Benefit payments	(38,334)	(33,037)
Effect of changes in the foreign exchange rate	0	0
Ending balance	3,761,470	3,554,274
Effect of changes in discount rate assumptions	(330,868)	(282,670)
Ending balance	3,430,602	3,271,604
Net liability for future policy benefits at original discount rates	1,872,516	1,752,482
Effect of changes in discount rate assumptions	(219,265)	(174,904)
Other Adjustments	1,315	444
Net liability for future policy benefits—long duration health	1,654,566	1,578,022
Reinsurance recoverable	0	(10,577)
Net liability for future policy benefits, after reinsurance recoverable, at current discount rates	1,654,566	1,567,445
Family Heritage | Health | Gain Loss From Expereince
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Policyholder benefits net of remeasurement gain (losses)	1,836	1,883
Family Heritage | Health | Gain (Loss) From Unlocking Assumptions
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Policyholder benefits net of remeasurement gain (losses)	$ 0	$ 0