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INVESTMENTS - Summary of Fixed Maturities and Equities in an Unrealized Loss Position (Details)
$ in Thousands
Dec. 31, 2022
USD ($)
security
Dec. 31, 2021
USD ($)
security
Fixed maturities    
Debt Securities, Available-For-Sale, Unrealized Loss Position, Fair Value [Abstract]    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 3,615,234 $ 390,141
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months 6,269,478 6,197,689
Debt Securities, Available-for-Sale, Unrealized Loss Position, Total 9,884,712 6,587,830
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (497,762) (17,715)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (358,826) (76,531)
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss $ (856,588) $ (94,246)
Number of positions in an unrealized loss | security 4,525 2,333
Continuous unrealized loss position | security 1,842 344
Fixed maturities | Below Investment Grade or Not Rated    
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss $ (64,000) $ (8,000)
U.S. government and agency    
Debt Securities, Available-For-Sale, Unrealized Loss Position, Fair Value [Abstract]    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 467,032 101,776
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months 1,414,181 2,014,880
Debt Securities, Available-for-Sale, Unrealized Loss Position, Total 1,881,213 2,116,656
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (41,365) (4,852)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (56,424) (15,795)
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss (97,789) (20,647)
Non-U.S. government    
Debt Securities, Available-For-Sale, Unrealized Loss Position, Fair Value [Abstract]    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 207,637 11,011
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months 298,048 463,498
Debt Securities, Available-for-Sale, Unrealized Loss Position, Total 505,685 474,509
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (33,027) (1,830)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (19,885) (7,855)
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss (52,912) (9,685)
Corporate debt    
Debt Securities, Available-For-Sale, Unrealized Loss Position, Fair Value [Abstract]    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,562,355 152,962
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months 2,350,504 1,681,859
Debt Securities, Available-for-Sale, Unrealized Loss Position, Total 3,912,859 1,834,821
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (268,289) (6,542)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (150,701) (31,570)
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss (418,990) (38,112)
Agency RMBS    
Debt Securities, Available-For-Sale, Unrealized Loss Position, Fair Value [Abstract]    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 220,595 41,024
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months 771,191 503,988
Debt Securities, Available-for-Sale, Unrealized Loss Position, Total 991,786 545,012
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (40,469) (1,678)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (58,832) (7,103)
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss (99,301) (8,781)
CMBS    
Debt Securities, Available-For-Sale, Unrealized Loss Position, Fair Value [Abstract]    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 343,494 30,128
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months 599,877 347,515
Debt Securities, Available-for-Sale, Unrealized Loss Position, Total 943,371 377,643
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (40,888) (1,001)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (41,257) (3,686)
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss (82,145) (4,687)
Non-agency RMBS    
Debt Securities, Available-For-Sale, Unrealized Loss Position, Fair Value [Abstract]    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 75,137 4,481
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months 53,484 109,937
Debt Securities, Available-for-Sale, Unrealized Loss Position, Total 128,621 114,418
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (14,691) (523)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (3,834) (1,500)
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss (18,525) (2,023)
ABS    
Debt Securities, Available-For-Sale, Unrealized Loss Position, Fair Value [Abstract]    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 685,990 43,466
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months 686,190 1,040,363
Debt Securities, Available-for-Sale, Unrealized Loss Position, Total 1,372,180 1,083,829
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (48,913) (1,152)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (21,808) (8,513)
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss (70,721) (9,665)
Municipals    
Debt Securities, Available-For-Sale, Unrealized Loss Position, Fair Value [Abstract]    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 52,994 5,293
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months 96,003 35,649
Debt Securities, Available-for-Sale, Unrealized Loss Position, Total 148,997 40,942
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (10,120) (137)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (6,085) (509)
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss $ (16,205) $ (646)