New Accounting Standards - Schedule of Liability For Future Policy Benefits To Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Jan. 01, 2021	Dec. 31, 2020
Liability for Future Policy Benefit, Activity [Line Items]
Total future policy benefits				$ 24,994,257	$ 15,243,536
Additional insurance liabilities				2,008,399	2,218,116
Unearned and advance premium	$ 266,710	$ 253,140		243,369	61,728
Policy claims and other benefits payable	510,929	507,219		473,524	399,507
Other policyholders' funds	187,873	123,236		98,459	97,968
Total policy liabilities	19,712,026	$ 18,923,637		25,809,609	15,802,739
Life
Liability for Future Policy Benefit, Activity [Line Items]
Total future policy benefits	14,730,271		$ 14,890,474	19,987,227	10,910,418
Health
Liability for Future Policy Benefit, Activity [Line Items]
Total future policy benefits	$ 2,274,790		$ 2,311,780	$ 2,998,631	$ 2,115,002