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Investments (Tables)
 3 Months Ended
Mar. 31, 2022
Investments [Abstract]  
Schedule of Fair Value of Fixed Maturity and Equity Investments Trading
The following table summarizes the fair value of fixed maturity investments trading:
March 31,
2022		December 31,
2021
U.S. treasuries$5,792,746 $6,247,779 
Agencies363,256 361,684 
Non-U.S. government485,193 549,613 
Non-U.S. government-backed corporate431,008 474,848 
Corporate3,420,946 3,214,438 
Agency mortgage-backed714,176 721,955 
Non-agency mortgage-backed212,145 233,346 
Commercial mortgage-backed567,186 634,925 
Asset-backed1,042,429 1,068,543 
Total fixed maturity investments trading$13,029,085 $13,507,131 
The following table summarizes the fair value of equity investments trading:
March 31,
2022		December 31,
2021
Financials$125,395 $146,615 
Communications and technology74,567 82,444 
Consumer48,634 51,083 
Industrial, utilities and energy29,028 26,645 
Healthcare28,135 28,796 
Basic materials4,915 5,092 
Equity exchange traded funds107,814 114,919 
Fixed income exchange traded funds454,780 90,422 
Total$873,268 $546,016 
Schedule of Contractual Maturities of Fixed Maturity Investments
Contractual maturities of fixed maturity investments trading are described in the following table. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
March 31, 2022Amortized 
Cost		Fair Value
Due in less than one year
$435,206 $434,040 
Due after one through five years
6,363,352 6,147,438 
Due after five through ten years
3,870,535 3,650,795 
Due after ten years
282,741 260,876 
Mortgage-backed
1,535,330 1,493,507 
Asset-backed1,053,737 1,042,429 
Total
$13,540,901 $13,029,085 
Schedule of Net Investment Income
The components of net investment income are as follows:
Three months ended
March 31,
2022		March 31,
2021
Fixed maturity investments$62,417 $62,933 
Short term investments1,136 573 
Equity investments2,754 1,491 
Other investments
Catastrophe bonds17,360 14,468 
Other5,552 3,801 
Cash and cash equivalents(41)102 
 89,178 83,368 
Investment expenses(5,487)(3,564)
Net investment income$83,691 $79,804 
Schedule of Net Realized and Unrealized Gains (Losses)
Net realized and unrealized gains (losses) on investments are as follows:
Three months ended
March 31,
2022		March 31,
2021
Net realized gains (losses) on fixed maturity investments trading$(121,152)$20,398 
Net unrealized gains (losses) on fixed maturity investments trading(464,177)(297,018)
Net realized and unrealized gains (losses) on fixed maturity investments trading(585,329)(276,620)
Net realized and unrealized gains (losses) on investments-related derivatives(40,288)14,861 
Net realized gains (losses) on equity investments trading sold during the period(20)109,887 
Net unrealized gains (losses) on equity investments trading still held at reporting date(48,669)(177,809)
Net realized and unrealized gains (losses) on equity investments trading(48,689)(67,922)
Net realized and unrealized gains (losses) on other investments - catastrophe bonds(8,261)(19,083)
Net realized and unrealized gains (losses) on other investments - other
9,550 3,201 
Net realized and unrealized gains (losses) on investments$(673,017)$(345,563)
(1)Net realized and unrealized gains (losses) on investment-related derivatives includes fixed maturity investments related derivatives (interest rate futures, interest rate swaps, credit default swaps and total return swaps), and equity investments related derivatives (equity futures). See “Note 13. Derivative Instruments” for additional information.