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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2023
Fair Value Disclosures [Abstract]  
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis
Below is a summary of the assets and liabilities that are measured at fair value on a recurring basis and also represents the carrying amount on the Company’s consolidated balance sheets:
At December 31, 2023TotalQuoted
Prices in Active
Markets for
Identical 
Assets
(Level 1)
Significant
Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Fixed maturity investments trading
U.S. treasuries$10,060,203 $10,060,203 $— $— 
Corporate (1)
6,499,075 — 6,499,075 — 
Asset-backed1,491,695 — 1,491,695 — 
Residential mortgage-backed1,420,362 — 1,420,362 — 
Agencies489,117 — 489,117 — 
Non-U.S. government483,576 — 483,576 — 
Commercial mortgage-backed433,080 — 433,080 — 
Total fixed maturity investments trading
20,877,108 10,060,203 10,816,905 — 
Short term investments4,604,079 130,232 4,473,847 — 
Equity investments106,766 106,766 — — 
Other investments
Catastrophe bonds1,942,199 — 1,942,199 — 
Term loans97,658 — — 97,658 
Direct private equity investments 59,905 — — 59,905 
2,099,762 — 1,942,199 157,563 
Fund investments (2)
1,415,804 — — — 
Total other investments3,515,566 — 1,942,199 157,563 
Other assets and (liabilities)
Assumed and ceded (re)insurance contracts (3)
(515)— — (515)
Derivative assets (4)
44,724 16,701 28,023 — 
Derivative liabilities (4)
(29,992)(10,372)(19,620)— 
Total other assets and (liabilities)14,217 6,329 8,403 (515)
 
$29,117,736 $10,303,530 $17,241,354 $157,048 
(1)Corporate fixed maturity investments include non-U.S. government-backed corporate fixed maturity investments.
(2)Fund investments, which may include private equity funds, private credit funds, and hedge funds are measured at fair value using the net asset value per share (or its equivalent) as a practical expedient and have not been classified in the fair value hierarchy. The fair value presented in this table is provided to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheet.
(3)Included in assumed and ceded (re)insurance contracts at December 31, 2023 was $2.2 million of other assets and $2.7 million of other liabilities.
(4)Refer to “Note 19. Derivative Instruments” for additional information related to the fair value, by type of contract, of derivatives entered into by the Company.
At December 31, 2022TotalQuoted
Prices in Active
Markets for
Identical
 Assets
(Level 1)
Significant
Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Fixed maturity investments trading
U.S. treasuries$7,180,129 $7,180,129 $— $— 
Corporate (1)
4,390,568 — 4,390,568 — 
Agencies395,149 — 395,149 — 
Non-U.S. government383,838 — 383,838 — 
Residential mortgage-backed710,429 — 710,429 — 
Commercial mortgage-backed213,987 — 213,987 — 
Asset-backed1,077,302 — 1,077,302 — 
Total fixed maturity investments trading
14,351,402 7,180,129 7,171,273 — 
Short term investments4,669,272 — 4,669,272 — 
Equity investments625,058 625,058 — — 
Other investments
Catastrophe bonds1,241,468 — 1,241,468 — 
Term loans100,000 — — 100,000 
Direct private equity investments66,780 — — 66,780 
1,408,248 — 1,241,468 166,780 
Fund investments (2)
1,086,706 — — — 
Total other investments2,494,954 — 1,241,468 166,780 
Other assets and (liabilities)
Assumed and ceded (re)insurance contracts (3)
(1,832)— — (1,832)
Derivative assets (4)
44,400 387 44,013 — 
Derivative liabilities (4)
(7,560)(2,008)(5,552)— 
Total other assets and (liabilities)35,008 (1,621)38,461 (1,832)
 $22,175,694 $7,803,566 $13,120,474 $164,948 
(1)Corporate fixed maturity investments include non-U.S. government-backed corporate fixed maturity investments.
(2)Fund investments, which may include private equity funds, private credit funds, and hedge funds are measured at fair value using the net asset value per share (or its equivalent) as a practical expedient and have not been classified in the fair value hierarchy. The fair value presented in this table is provided to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheet.
(3)Included in assumed and ceded (re)insurance contracts at December 31, 2022 was $3.5 million of other assets and $5.3 million of other liabilities.
(4)Refer to “Note 19. Derivative Instruments” for additional information related to the fair value, by type of contract, of derivatives entered into by the Company.
Schedule of Quantitative Information Used as Level 3 Inputs
Below is a summary of quantitative information regarding the significant unobservable inputs (Level 3) used in determining the fair value of assets and liabilities measured at fair value on a recurring basis:
At December 31, 2023Fair Value
(Level 3)
Valuation TechniqueUnobservable InputsWeighted Average or Actual

Other investments
Direct private equity investments$59,905 Internal valuation modelDiscount rate10.0 %
Liquidity discount15.0 %
Term loans97,658 Discounted cash flowCredit spread adjustment0.2 %
Risk premium2.6 %
Total other investments157,563 
Other assets and (liabilities)
Assumed and ceded (re)insurance contracts
(515)Internal valuation modelNet undiscounted cash flows$12,478 
Expected loss ratio2.3 %
Discount rate20.7 %
Total other assets and (liabilities)
(515)
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs
$157,048 
At December 31, 2022
Fair Value
(Level 3)
Valuation TechniqueUnobservable InputsWeighted Average or Actual

Other investments
Direct private equity investments$66,780 Internal valuation modelDiscount rate7.5 %
Liquidity discount15.0 %
Term loans100,000 Discounted cash flowCredit spread adjustment0.2 %
Risk premium2.6 %
Total other investments166,780 
Other assets and (liabilities)
Assumed and ceded (re)insurance contracts
(1,832)Internal valuation modelNet undiscounted cash flows$14,734 
Expected loss ratio5.8 %
Discount rate4.0 %
Total other assets and (liabilities)
(1,832)
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs
$164,948 
Schedule of Assets and Liabilities Measured at Fair Value an a Recurring Basis Using Level 3 Inputs
Below is a reconciliation of the beginning and ending balances, for the periods shown, of assets and liabilities measured at fair value on a recurring basis using Level 3 inputs.
  
Other
Investments
Direct Private Equity Investments
Term Loans
Other Assets
and
(Liabilities)
Total
Balance - January 1, 2023$66,780 $100,000 $(1,832)$164,948 
Included in net investment income250 — — 250 
Included in net realized and unrealized gains (losses) on investments(7,120)— — (7,120)
Included in other income (loss)
— — (492)(492)
Total foreign exchange gains (losses)
(5)— — (5)
Purchases— — 1,809 1,809 
Settlements— (2,342)— (2,342)
Balance - December 31, 2023$59,905 $97,658 $(515)$157,048 

  
Other
Investments
Direct Private Equity Investments
Term Loans
Other Assets
and
(Liabilities)
Total
Balance - January 1, 2022$88,373 $74,850 $(4,727)$158,496 
Included in net investment income
188 605 — 793 
Included in net realized and unrealized gains (losses) on investments(26,893)— — (26,893)
Included in other income (loss)
— — 2,682 2,682 
Total foreign exchange gains (losses)
(11)— — (11)
Purchases5,123 25,000 213 30,336 
Settlements— (455)— (455)
Balance - December 31, 2022$66,780 $100,000 $(1,832)$164,948 
Schedule of Assets and Liabilities Measured at Fair Value an a Recurring Basis Using Level 3 Inputs
Below is a reconciliation of the beginning and ending balances, for the periods shown, of assets and liabilities measured at fair value on a recurring basis using Level 3 inputs.
  
Other
Investments
Direct Private Equity Investments
Term Loans
Other Assets
and
(Liabilities)
Total
Balance - January 1, 2023$66,780 $100,000 $(1,832)$164,948 
Included in net investment income250 — — 250 
Included in net realized and unrealized gains (losses) on investments(7,120)— — (7,120)
Included in other income (loss)
— — (492)(492)
Total foreign exchange gains (losses)
(5)— — (5)
Purchases— — 1,809 1,809 
Settlements— (2,342)— (2,342)
Balance - December 31, 2023$59,905 $97,658 $(515)$157,048 

  
Other
Investments
Direct Private Equity Investments
Term Loans
Other Assets
and
(Liabilities)
Total
Balance - January 1, 2022$88,373 $74,850 $(4,727)$158,496 
Included in net investment income
188 605 — 793 
Included in net realized and unrealized gains (losses) on investments(26,893)— — (26,893)
Included in other income (loss)
— — 2,682 2,682 
Total foreign exchange gains (losses)
(11)— — (11)
Purchases5,123 25,000 213 30,336 
Settlements— (455)— (455)
Balance - December 31, 2022$66,780 $100,000 $(1,832)$164,948 
Schedule of the Balances the Company has Elected to Account for at Fair Value Below is a summary of the balances the Company has elected to account for at fair value:
At December 31,20232022
Other investments$3,515,566 $2,494,954 
Other assets$2,227 $3,499 
Other liabilities$2,742 $5,331 
Schedule of Other Investments Measured Using Net Asset Valuations
The table below shows the Company’s portfolio of other investments measured using net asset valuations as a practical expedient:
At December 31, 2023Fair ValueUnfunded
Commitments
Redemption FrequencyRedemption
Notice Period (Minimum Days)
Redemption
Notice Period (Maximum Days)
Private credit funds$982,016 $949,135 See belowSee belowSee below
Private equity funds433,788 673,778 See belowSee belowSee below
Total other investments measured using net asset valuations
$1,415,804 $1,622,913 
At December 31, 2022Fair ValueUnfunded
Commitments
Redemption FrequencyRedemption
Notice Period (Minimum Days)
Redemption
Notice Period (Maximum Days)
Private credit funds$771,383 $714,302 See belowSee belowSee below
Private equity funds315,323 493,155 See belowSee belowSee below
Total other investments measured using net asset valuations
$1,086,706 $1,207,457 
Schedule of Variable Interest Entities
The following table summarizes the aggregate carrying amount of the unconsolidated fund investments in VIEs, as well as our maximum exposure to loss associated with these VIEs:
Maximum Exposure to Loss
At December 31, 2023Carrying amountUnfunded CommitmentsTotal
Other investments$1,251,799 $1,550,452 $2,802,251 
At December 31, 2022
Other investments$916,248 $1,148,630 $2,064,878