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INVESTMENTS - Contractual Maturities (Details) - USD ($)
Jun. 30, 2024
Dec. 31, 2023
Amortized cost    
Due in one year or less $ 569,486,000 $ 474,557,000
Due after one year through five years 5,726,646,000 5,902,571,000
Due after five years through ten years 2,436,399,000 2,064,619,000
Due after ten years 185,062,000 157,653,000
Total fixed maturities with a single maturity date 8,917,593,000 8,599,400,000
Amortized cost, total 13,009,189,000 12,634,254,000
Fair value    
Due in one year or less 560,802,000 463,789,000
Due after one year through five years 5,605,176,000 5,790,493,000
Due after five years through ten years 2,318,770,000 1,954,449,000
Due after ten years 177,239,000 155,287,000
Total fixed maturities with a single maturity date 8,661,987,000 8,364,018,000
Fair value, total $ 12,585,137,000 $ 12,234,742,000
% of Total fair value    
Due in one year or less 4.50% 3.60%
Due after one year through five years (as a percent) 44.50% 47.30%
Due after five years through ten years (as a percent) 18.40% 16.00%
Due after ten years (as a percent) 1.40% 1.30%
Fixed maturities with a single maturity date (as a percent) 68.80% 68.20%
Total (as a percent) 100.00% 100.00%
Agency RMBS    
Amortized cost    
Fixed maturities without a single maturity date $ 1,692,741,000 $ 1,706,204,000
Amortized cost, total 1,692,741,000 1,706,204,000
Fair value    
Fixed maturities without a single maturity date 1,601,027,000 1,634,661,000
Fair value, total $ 1,601,027,000 $ 1,634,661,000
% of Total fair value    
Fixed maturities without a single maturity date (as a percent) 12.70% 13.40%
CMBS    
Amortized cost    
Fixed maturities without a single maturity date $ 874,187,000 $ 897,553,000
Amortized cost, total 874,187,000 897,553,000
Fair value    
Fixed maturities without a single maturity date 824,715,000 839,696,000
Fair value, total $ 824,715,000 $ 839,696,000
% of Total fair value    
Fixed maturities without a single maturity date (as a percent) 6.60% 6.90%
Non-agency RMBS    
Amortized cost    
Fixed maturities without a single maturity date $ 138,135,000 $ 165,910,000
Amortized cost, total 138,135,000 165,910,000
Fair value    
Fixed maturities without a single maturity date 126,764,000 153,396,000
Fair value, total $ 126,764,000 $ 153,396,000
% of Total fair value    
Fixed maturities without a single maturity date (as a percent) 1.00% 1.30%
ABS    
Amortized cost    
Fixed maturities without a single maturity date $ 1,386,533,000 $ 1,265,187,000
Amortized cost, total 1,386,533,000 1,265,187,000
Fair value    
Fixed maturities without a single maturity date 1,370,644,000 1,242,971,000
Fair value, total $ 1,370,644,000 $ 1,242,971,000
% of Total fair value    
Fixed maturities without a single maturity date (as a percent) 10.90% 10.20%
Held-to-maturity securities without a single maturity date $ 533,000,000 $ 591,000,000
Corporate debt    
Amortized cost    
Amortized cost, total 5,271,600,000 4,651,654,000
Fair value    
Fair value, total 5,086,527,000 4,474,172,000
% of Total fair value    
Held-to-maturity securities with maturity after one year through three years 22,000,000 0
Held-to-maturity securities with maturity after three years through ten years $ 83,000,000 $ 95,000,000