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Investments - Schedule of Fair Value of Fixed Maturity Investments Trading (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Schedule of Investments [Line Items]
Total fixed maturity investments trading	$ 13,085,367	$ 13,507,131
U.S. treasuries
Schedule of Investments [Line Items]
Total fixed maturity investments trading	6,012,779	6,247,779
Agencies
Schedule of Investments [Line Items]
Total fixed maturity investments trading	366,752	361,684
Non-U.S. government
Schedule of Investments [Line Items]
Total fixed maturity investments trading	450,590	549,613
Corporate
Schedule of Investments [Line Items]
Total fixed maturity investments trading	3,901,805	3,689,286
Residential mortgage-backed
Schedule of Investments [Line Items]
Total fixed maturity investments trading	902,508	955,301
Commercial mortgage-backed
Schedule of Investments [Line Items]
Total fixed maturity investments trading	443,070	634,925
Asset-backed
Schedule of Investments [Line Items]
Total fixed maturity investments trading	$ 1,007,863	$ 1,068,543

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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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-Publisher FASB
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-Topic 320
-SubTopic 10
-Section 45
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