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Separate Accounts - Schedule of Balances of and Changes in Separate Account Liabilities (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Separate Accounts Disclosure [Abstract]    
Separate Account, Liability, Beginning Balance $ 2,209,287 $ 2,395,842
Premiums, deposits and transfers 128,345 147,995
Surrenders, withdrawals and transfers (320,283) (378,126)
Investment performance 266,258 300,545
Management fees and other charges (44,042) (57,734)
Foreign exchange translation 74,309 (199,235)
Separate Account, Liability, Ending Balance 2,313,874 2,209,287
Cash surrender value $ 2,283,915 $ 2,173,070