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Investment Information - Summary of available for sale securities (Details) - USD ($) $ in Thousands		Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value		$ 19,981,477	$ 19,732,825
Gross Unrealized Gains		92,068	198,691
Gross Unrealized Losses		(726,652)	(171,544)
Allowance for Expected Credit Losses		(34,145)	(2,883)	$ (3,830)	$ (2,397)
Cost or Amortized Cost		20,650,206	19,708,561
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Allowance for Expected Credit Losses		(106)	(2)	(2)	(11)
Asset backed securities
Debt Securities, Available-for-sale [Line Items]
Allowance for Expected Credit Losses	[1]	(6,998)	(802)	$ (1,207)	$ (1,490)
Fixed maturities
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value		17,648,853	17,998,109
Gross Unrealized Gains		91,310	198,123
Gross Unrealized Losses		(726,005)	(170,954)
Allowance for Expected Credit Losses		(34,145)	(2,883)
Cost or Amortized Cost		18,317,693	17,973,823
Fixed maturities | Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value		7,231,686	6,553,333
Gross Unrealized Gains		31,393	104,170
Gross Unrealized Losses		(356,464)	(69,194)
Allowance for Expected Credit Losses		(26,509)	(2,037)
Cost or Amortized Cost		7,583,266	6,520,394
Fixed maturities | Mortgage backed securities
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value		416,138	408,477
Gross Unrealized Gains		1,717	2,825
Gross Unrealized Losses		(28,430)	(5,410)
Allowance for Expected Credit Losses		(797)	(48)
Cost or Amortized Cost		443,648	411,110
Fixed maturities | Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value		370,470	404,666
Gross Unrealized Gains		4,169	18,724
Gross Unrealized Losses		(10,900)	(1,409)
Allowance for Expected Credit Losses		(106)	(2)
Cost or Amortized Cost		377,307	387,353
Fixed maturities | Commercial mortgage backed securities
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value		1,066,365	1,046,484
Gross Unrealized Gains		751	1,740
Gross Unrealized Losses		(15,862)	(3,117)
Allowance for Expected Credit Losses		(256)	(6)
Cost or Amortized Cost		1,081,732	1,047,867
Fixed maturities | US government and government agencies
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value		4,716,790	4,772,764
Gross Unrealized Gains		10,031	10,076
Gross Unrealized Losses		(178,836)	(45,967)
Allowance for Expected Credit Losses		0	0
Cost or Amortized Cost		4,885,595	4,808,655
Fixed maturities | Non-US government securities
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value		2,169,714	2,120,294
Gross Unrealized Gains		42,121	54,048
Gross Unrealized Losses		(92,040)	(34,749)
Allowance for Expected Credit Losses		(532)	(82)
Cost or Amortized Cost		2,220,165	2,101,077
Fixed maturities | Asset backed securities
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value		1,677,690	2,692,091
Gross Unrealized Gains		1,128	6,540
Gross Unrealized Losses		(43,473)	(11,108)
Allowance for Expected Credit Losses		(5,945)	(708)
Cost or Amortized Cost		1,725,980	2,697,367
Short-term investments
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value		2,332,624	1,734,716
Gross Unrealized Gains		758	568
Gross Unrealized Losses		(647)	(590)
Allowance for Expected Credit Losses		0	0
Cost or Amortized Cost		$ 2,332,513	$ 1,734,738
[1] Includes asset backed securities, mortgage backed securities and commercial mortgage backed securities.

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