Investments (Realized Investment Gains Losses, Net) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Schedule Of Gain Loss On Investments [Line Items]
Realized Investment gains (losses), net	$ (106,374)	$ (2,805)	[1]
Fixed maturities
Schedule Of Gain Loss On Investments [Line Items]
Realized Investment gains (losses), net	(11,944)	(6,837)
Commercial mortgage and other loans
Schedule Of Gain Loss On Investments [Line Items]
Realized Investment gains (losses), net	(2,597)	(5,781)
LPs/LLCs
Schedule Of Gain Loss On Investments [Line Items]
Realized Investment gains (losses), net	(6)	0
Derivatives
Schedule Of Gain Loss On Investments [Line Items]
Realized Investment gains (losses), net	(49,859)	(5,351)
Short-term investments and cash equivalents
Schedule Of Gain Loss On Investments [Line Items]
Realized Investment gains (losses), net	(83)	(347)
Ceded income on modified coinsurance investments
Schedule Of Gain Loss On Investments [Line Items]
Realized Investment gains (losses), net	(176,702)	33,505
Other
Schedule Of Gain Loss On Investments [Line Items]
Realized Investment gains (losses), net	$ 134,817	$ (17,994)

[1] Amounts reflect revision to prior period Financial Statements. See Note 16 for additional information.