Deferred Policy Acquisition Costs - Balances and Activity in DAC Roll Forward (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Deferred Policy Acquisition Cost [Line Items]
DAC balance, beginning of period			$ 3,447,234
Amortization	$ (73,643)	$ (68,110)	(145,692)	$ (136,033)
DAC balance, end of period	3,566,126		3,566,126		$ 3,447,234
Term Life [Member]
Deferred Policy Acquisition Cost [Line Items]
DAC balance, beginning of period			3,366,281	3,106,148	3,106,148
Capitalization			274,632		521,718
Amortization			(142,407)		(268,803)
Foreign exchange translation and other			(9,130)		7,218
DAC balance, end of period	3,489,376		3,489,376		3,366,281
Segregated Funds (Canada) [Member]
Deferred Policy Acquisition Cost [Line Items]
DAC balance, beginning of period			63,029	$ 62,341	62,341
Capitalization			1,562		4,353
Amortization			(2,679)		(5,479)
Foreign exchange translation and other			(2,288)		1,814
DAC balance, end of period	$ 59,624		$ 59,624		$ 63,029