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Investment Information - Aging of available for sale securities in an unrealized loss position (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months $ 16,180,106 $ 12,238,683
Estimated Fair Value - 12 Months or More 869,409 297,357
Estimated Fair Value 17,049,515 12,536,040
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (1,145,737) (157,279)
Gross Unrealized Losses - 12 Months or More (112,851) (14,265)
Gross Unrealized Losses (1,258,588) (171,544)
Fixed maturities    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months 15,674,308 11,953,950
Estimated Fair Value - 12 Months or More 869,409 297,357
Estimated Fair Value 16,543,717 12,251,307
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (1,144,480) (156,689)
Gross Unrealized Losses - 12 Months or More (112,851) (14,265)
Gross Unrealized Losses (1,257,331) (170,954)
Fixed maturities | Corporate bonds    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months 6,583,215 3,639,582
Estimated Fair Value - 12 Months or More 489,098 98,867
Estimated Fair Value 7,072,313 3,738,449
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (580,235) (63,938)
Gross Unrealized Losses - 12 Months or More (75,429) (5,256)
Gross Unrealized Losses (655,664) (69,194)
Fixed maturities | Mortgage backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months 595,485 222,176
Estimated Fair Value - 12 Months or More 61,751 46,809
Estimated Fair Value 657,236 268,985
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (46,415) (3,545)
Gross Unrealized Losses - 12 Months or More (9,483) (1,865)
Gross Unrealized Losses (55,898) (5,410)
Fixed maturities | Municipal bonds    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months 271,481 26,665
Estimated Fair Value - 12 Months or More 8,876 16,361
Estimated Fair Value 280,357 43,026
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (17,908) (385)
Gross Unrealized Losses - 12 Months or More (1,028) (1,024)
Gross Unrealized Losses (18,936) (1,409)
Fixed maturities | Commercial mortgage backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months 973,212 675,603
Estimated Fair Value - 12 Months or More 0 5,908
Estimated Fair Value 973,212 681,511
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (42,056) (2,805)
Gross Unrealized Losses - 12 Months or More 0 (312)
Gross Unrealized Losses (42,056) (3,117)
Fixed maturities | US government and government agencies    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months 4,029,550 4,211,621
Estimated Fair Value - 12 Months or More 69,596 33,373
Estimated Fair Value 4,099,146 4,244,994
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (235,510) (44,180)
Gross Unrealized Losses - 12 Months or More (5,276) (1,787)
Gross Unrealized Losses (240,786) (45,967)
Fixed maturities | Non-US government securities    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months 1,929,278 1,511,301
Estimated Fair Value - 12 Months or More 103,969 62,957
Estimated Fair Value 2,033,247 1,574,258
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (148,781) (31,983)
Gross Unrealized Losses - 12 Months or More (14,943) (2,766)
Gross Unrealized Losses (163,724) (34,749)
Fixed maturities | Asset backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months 1,292,087 1,667,002
Estimated Fair Value - 12 Months or More 136,119 33,082
Estimated Fair Value 1,428,206 1,700,084
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (73,575) (9,853)
Gross Unrealized Losses - 12 Months or More (6,692) (1,255)
Gross Unrealized Losses (80,267) (11,108)
Short-term investments    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months 505,798 284,733
Estimated Fair Value - 12 Months or More 0 0
Estimated Fair Value 505,798 284,733
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (1,257) (590)
Gross Unrealized Losses - 12 Months or More 0 0
Gross Unrealized Losses $ (1,257) $ (590)