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Investments - Schedule of Contractual Maturities of Fixed Maturity Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Amortized Cost |  |
Due in less than one year | $ 587,720 | $ 364,501
Due after one through five years | 11,439,510 | 8,117,971
Due after five through ten years | 5,182,667 | 4,072,142
Due after ten years | 307,392 | 356,268
Amortized cost | 20,872,450 | 15,038,551
Debt Securities, Trading, and Equity Securities, FV-NI [Abstract] |  |
Due in less than one year | 582,519 | 356,770
Due after one through five years | 11,468,263 | 7,875,771
Due after five through ten years | 5,188,716 | 3,805,287
Due after ten years | 292,473 | 311,856
Fixed maturity investments trading | 20,877,108 | 14,351,402
Mortgage-backed |  |
Amortized Cost |  |
Amortized cost | 1,864,520 | 1,009,205
Debt Securities, Trading, and Equity Securities, FV-NI [Abstract] |  |
Fixed maturity investments trading | 1,853,442 | 924,416
Asset-backed |  |
Amortized Cost |  |
Amortized cost | 1,490,641 | 1,118,464
Debt Securities, Trading, and Equity Securities, FV-NI [Abstract] |  |
Fixed maturity investments trading | $ 1,491,695 | $ 1,077,302

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- Definition This item represents the fair value of debt securities which are expected to mature after five through ten years of the balance sheet date and are categorized as trading securities. + References No definition available. + Details
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- Definition This item represents debt securities, at cost, net of adjustments including accretion, amortization and collection of cash, if any, which are expected to mature within one year of the balance sheet date and are categorized as trading securities. + References No definition available. + Details
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- Definition This item represents debt securities, at cost, net of adjustments including accretion, amortization and collection of cash, if any, which are expected to mature after ten years of the balance sheet date and are categorized as trading securities. + References No definition available. + Details
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- Definition This item represents the fair value of debt securities which are expected to mature after ten years of the balance sheet date and are categorized as trading securities. + References No definition available. + Details
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- Definition This item represents debt securities, at cost, net of adjustments including accretion, amortization and collection of cash, if any, which are expected to mature within one year of the balance sheet date and are categorized as trading securities. + References No definition available. + Details
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- Definition This item represents the fair value of debt securities which are expected to mature within one year of the balance sheet date and are categorized as trading securities. + References No definition available. + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481830/320-10-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483467/210-10-45-1 + Details
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