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INVESTMENTS | 6 Months Ended
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Jun. 30, 2024
Investments, Debt and Equity Securities [Abstract] |
INVESTMENTS | INVESTMENTS a) Fixed Maturities, Available for Sale The following table provides the amortized cost and fair values of the Company's fixed maturities classified as available for sale:
|  | Amortized cost |  | Allowance for expected credit losses |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value |  |  |
| At June 30, 2024 |  |  |  |  |  |  |  |  |  |  |  |
| Available for sale |  |  |  |  |  |  |  |  |  |  |  |
| U.S. government and agency | $ | 2,713,759 |  |  | $ | — |  |  | $ | 6,506 |  |  | $ | (47,299) |  |  | $ | 2,672,966 |  |  |  |
| Non-U.S. government | 771,227 |  |  | (74) |  |  | 3,605 |  |  | (23,250) |  |  | 751,508 |  |  |  |
| Corporate debt | 5,271,600 |  |  | (4,303) |  |  | 30,067 |  |  | (210,837) |  |  | 5,086,527 |  |  |  |
| Agency RMBS(1) | 1,692,741 |  |  | — |  |  | 2,304 |  |  | (94,018) |  |  | 1,601,027 |  |  |  |
| CMBS(2) | 874,187 |  |  | — |  |  | 540 |  |  | (50,012) |  |  | 824,715 |  |  |  |
| Non-agency RMBS | 138,135 |  |  | (203) |  |  | 456 |  |  | (11,624) |  |  | 126,764 |  |  |  |
| ABS(3) | 1,386,533 |  |  | (51) |  |  | 2,661 |  |  | (18,499) |  |  | 1,370,644 |  |  |  |
| Municipals(4) | 161,007 |  |  | — |  |  | 225 |  |  | (10,246) |  |  | 150,986 |  |  |  |
| Total fixed maturities, available for sale | $ | 13,009,189 |  |  | $ | (4,631) |  |  | $ | 46,364 |  |  | $ | (465,785) |  |  | $ | 12,585,137 |  |  |  |
| At December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |
| Available for sale |  |  |  |  |  |  |  |  |  |  |  |
| U.S. government and agency | $ | 3,049,445 |  |  | $ | — |  |  | $ | 13,211 |  |  | $ | (55,128) |  |  | $ | 3,007,528 |  |  |  |
| Non-U.S. government | 729,761 |  |  | (30) |  |  | 13,089 |  |  | (18,861) |  |  | 723,959 |  |  |  |
| Corporate debt | 4,651,654 |  |  | (10,438) |  |  | 49,434 |  |  | (216,478) |  |  | 4,474,172 |  |  |  |
| Agency RMBS(1) | 1,706,204 |  |  | — |  |  | 11,495 |  |  | (83,038) |  |  | 1,634,661 |  |  |  |
| CMBS(2) | 897,553 |  |  | — |  |  | 551 |  |  | (58,408) |  |  | 839,696 |  |  |  |
| Non-agency RMBS | 165,910 |  |  | (194) |  |  | 713 |  |  | (13,033) |  |  | 153,396 |  |  |  |
| ABS(3) | 1,265,187 |  |  | (50) |  |  | 2,855 |  |  | (25,021) |  |  | 1,242,971 |  |  |  |
| Municipals(4) | 168,540 |  |  | (47) |  |  | 414 |  |  | (10,548) |  |  | 158,359 |  |  |  |
| Total fixed maturities, available for sale | $ | 12,634,254 |  |  | $ | (10,759) |  |  | $ | 91,762 |  |  | $ | (480,515) |  |  | $ | 12,234,742 |  |  |  |
(1)Residential mortgage-backed securities ("RMBS") originated by U.S. government-sponsored agencies. (2)Commercial mortgage-backed securities ("CMBS"). (3)Asset-backed securities ("ABS") include debt tranched securities collateralized primarily by auto loans, student loans, credit card receivables and collateralized loan obligations ("CLOs"). (4)Municipals include bonds issued by states, municipalities and political subdivisions. Contractual Maturities Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. The table below provides the contractual maturities of fixed maturities classified as available for sale:
|  | Amortized cost |  | Fair value |  | % of Total fair value |
| At June 30, 2024 |  |  |  |  |  |
| Maturity |  |  |  |  |  |
| Due in one year or less | $ | 569,486 |  |  | $ | 560,802 |  |  | 4.5 | % |
| Due after one year through five years | 5,726,646 |  |  | 5,605,176 |  |  | 44.5 | % |
| Due after five years through ten years | 2,436,399 |  |  | 2,318,770 |  |  | 18.4 | % |
| Due after ten years | 185,062 |  |  | 177,239 |  |  | 1.4 | % |
|  | 8,917,593 |  |  | 8,661,987 |  |  | 68.8 | % |
| Agency RMBS | 1,692,741 |  |  | 1,601,027 |  |  | 12.7 | % |
| CMBS | 874,187 |  |  | 824,715 |  |  | 6.6 | % |
| Non-agency RMBS | 138,135 |  |  | 126,764 |  |  | 1.0 | % |
| ABS | 1,386,533 |  |  | 1,370,644 |  |  | 10.9 | % |
| Total | $ | 13,009,189 |  |  | $ | 12,585,137 |  |  | 100.0 | % |
| At December 31, 2023 |  |  |  |  |  |
| Maturity |  |  |  |  |  |
| Due in one year or less | $ | 474,557 |  |  | $ | 463,789 |  |  | 3.6 | % |
| Due after one year through five years | 5,902,571 |  |  | 5,790,493 |  |  | 47.3 | % |
| Due after five years through ten years | 2,064,619 |  |  | 1,954,449 |  |  | 16.0 | % |
| Due after ten years | 157,653 |  |  | 155,287 |  |  | 1.3 | % |
|  | 8,599,400 |  |  | 8,364,018 |  |  | 68.2 | % |
| Agency RMBS | 1,706,204 |  |  | 1,634,661 |  |  | 13.4 | % |
| CMBS | 897,553 |  |  | 839,696 |  |  | 6.9 | % |
| Non-agency RMBS | 165,910 |  |  | 153,396 |  |  | 1.3 | % |
| ABS | 1,265,187 |  |  | 1,242,971 |  |  | 10.2 | % |
| Total | $ | 12,634,254 |  |  | $ | 12,234,742 |  |  | 100.0 | % |
Gross Unrealized Losses The following table summarizes fixed maturities, available for sale in an unrealized loss position and the aggregate fair value and gross unrealized loss by length of time the security has continuously been in an unrealized loss position:
|  | 12 months or greater |  | Less than 12 months |  | Total |
|  | Fair value |  | Unrealized losses |  | Fair value |  | Unrealized losses |  | Fair value |  | Unrealized losses |
| At June 30, 2024 |  |  |  |  |  |  |  |  |  |  |  |
| Fixed maturities, available for sale |  |  |  |  |  |  |  |  |  |  |  |
| U.S. government and agency | $ | 613,647 |  |  | $ | (36,799) |  |  | $ | 1,129,410 |  |  | $ | (10,500) |  |  | $ | 1,743,057 |  |  | $ | (47,299) |  |
| Non-U.S. government | 211,122 |  |  | (18,833) |  |  | 348,236 |  |  | (4,417) |  |  | 559,358 |  |  | (23,250) |  |
| Corporate debt | 2,173,470 |  |  | (194,191) |  |  | 1,202,422 |  |  | (16,646) |  |  | 3,375,892 |  |  | (210,837) |  |
| Agency RMBS | 765,043 |  |  | (87,306) |  |  | 501,789 |  |  | (6,712) |  |  | 1,266,832 |  |  | (94,018) |  |
| CMBS | 666,929 |  |  | (47,722) |  |  | 81,346 |  |  | (2,290) |  |  | 748,275 |  |  | (50,012) |  |
| Non-agency RMBS | 77,872 |  |  | (11,582) |  |  | 10,373 |  |  | (42) |  |  | 88,245 |  |  | (11,624) |  |
| ABS | 342,311 |  |  | (17,096) |  |  | 272,328 |  |  | (1,403) |  |  | 614,639 |  |  | (18,499) |  |
| Municipals | 117,590 |  |  | (9,742) |  |  | 20,588 |  |  | (504) |  |  | 138,178 |  |  | (10,246) |  |
| Total fixed maturities, available for sale | $ | 4,967,984 |  |  | $ | (423,271) |  |  | $ | 3,566,492 |  |  | $ | (42,514) |  |  | $ | 8,534,476 |  |  | $ | (465,785) |  |
| At December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |
| Fixed maturities, available for sale |  |  |  |  |  |  |  |  |  |  |  |
| U.S. government and agency | $ | 846,503 |  |  | $ | (42,465) |  |  | $ | 867,733 |  |  | $ | (12,663) |  |  | $ | 1,714,236 |  |  | $ | (55,128) |  |
| Non-U.S. government | 233,038 |  |  | (18,178) |  |  | 115,112 |  |  | (683) |  |  | 348,150 |  |  | (18,861) |  |
| Corporate debt | 2,623,304 |  |  | (210,512) |  |  | 240,813 |  |  | (5,966) |  |  | 2,864,117 |  |  | (216,478) |  |
| Agency RMBS | 778,656 |  |  | (80,070) |  |  | 218,606 |  |  | (2,968) |  |  | 997,262 |  |  | (83,038) |  |
| CMBS | 703,411 |  |  | (54,856) |  |  | 75,242 |  |  | (3,552) |  |  | 778,653 |  |  | (58,408) |  |
| Non-agency RMBS | 98,483 |  |  | (13,013) |  |  | 10,017 |  |  | (20) |  |  | 108,500 |  |  | (13,033) |  |
| ABS | 879,743 |  |  | (24,747) |  |  | 83,582 |  |  | (274) |  |  | 963,325 |  |  | (25,021) |  |
| Municipals | 129,969 |  |  | (10,156) |  |  | 6,238 |  |  | (392) |  |  | 136,207 |  |  | (10,548) |  |
| Total fixed maturities, available for sale | $ | 6,293,107 |  |  | $ | (453,997) |  |  | $ | 1,617,343 |  |  | $ | (26,518) |  |  | $ | 7,910,450 |  |  | $ | (480,515) |  |
At June 30, 2024, 4,248 fixed maturities (2023: 3,535) were in an unrealized loss position of $466 million (2023: $481 million), of which $12 million (2023: $13 million) was related to securities below investment grade or not rated. At June 30, 2024, 2,909 fixed maturities (2023: 3,212) had been in a continuous unrealized loss position for twelve months or greater and had a fair value of $4,968 million (2023: $6,293 million). The unrealized loss es of $466 million (2023: $481 million) were due to non-credit factors and were expected to be recovered as the related securities approach maturity. At June 30, 2024, the Company did not intend to sell the securities in an unrealized loss position and it is more likely than not that the Company will not be required to sell these securities before the anticipated recovery of their amortized costs. b) Fixed Maturities, Held to Maturity The following table provides the amortized cost and fair values of the Company's fixed maturities classified as held to maturity:
|  | Amortized cost |  | Allowance for expected credit losses |  | Net carrying value |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value |  |  |
| At June 30, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Corporate debt | $ | 105,192 |  |  | $ | — |  |  | $ | 105,192 |  |  | $ | 368 |  |  | $ | (9,229) |  |  | $ | 96,331 |  |  |  |
| ABS(1) | 532,600 |  |  | — |  |  | 532,600 |  |  | 759 |  |  | (367) |  |  | 532,992 |  |  |  |
| Total fixed maturities, held to maturity | $ | 637,792 |  |  | $ | — |  |  | $ | 637,792 |  |  | $ | 1,127 |  |  | $ | (9,596) |  |  | $ | 629,323 |  |  |  |
| At December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Corporate debt | $ | 95,200 |  |  | $ | — |  |  | $ | 95,200 |  |  | $ | 298 |  |  | $ | (8,827) |  |  | $ | 86,671 |  |  |  |
| ABS(1) | 591,096 |  |  | — |  |  | 591,096 |  |  | 5 |  |  | (1,921) |  |  | 589,180 |  |  |  |
| Total fixed maturities, held to maturity | $ | 686,296 |  |  | $ | — |  |  | $ | 686,296 |  |  | $ | 303 |  |  | $ | (10,748) |  |  | $ | 675,851 |  |  |  |
(1)Asset-backed securities ("ABS") include debt tranched securities collateralized primarily by collateralized loan obligations ("CLOs"). At June 30, 2024, fixed maturities, held to maturity of $638 million (2023: $686 million) were presented net of an allowance for expected credit losse s of $nil (2023: $nil). The Company's ABS, held to maturity consist of CLO debt tranched securities. The Company uses a scenario-based approach to review its CLO debt portfolio and reviews subordination levels of these securities to determine their ability to absorb credit losses of the underlying collateral. If losses are forecast to be below the subordination level for a tranche held by the Company, the security is determined not to have a credit loss. At June 30, 2024, the allowance for credit losses expected to be recognized over the life of the Company's ABS, held to maturity w as $nil. To estimate expected credit losses for corporate debt securities, held to maturity, the Company's projected cash flows are primarily driven by assumptions regarding the severity of loss, which is a function of the probability of default and projected recovery rates. The Company's default and recovery rates are based on credit ratings, credit analysis and macroeconomic forecasts. At June 30, 2024, the allowance for credit losses expected to be recognized over the life of the Company's corporate debt, held to m aturity was $nil. Contractual Maturities Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. ABS classified as held to maturity had a carrying value of $533 million (2023: $591 million). Corpo rate debt classified as held to maturity with a net carrying value of $22 million (2023: $nil) is due between 1 year and 3 years and corporate debt classified as held to maturity with a net carrying value of $83 million (2023: $95 million) is due between 3 years and 10 years. c) Equity Securities The following table provides the cost and fair values of the Company's equity securities:
|  | Cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value |
| At June 30, 2024 |  |  |  |  |  |  |  |
| Equity securities |  |  |  |  |  |  |  |
| Common stocks | $ | 2,843 |  |  | $ | 75 |  |  | $ | (423) |  |  | $ | 2,495 |  |
| Preferred stocks | 5,810 |  |  | 144 |  |  | (112) |  |  | 5,842 |  |
| Exchange-traded funds | 188,625 |  |  | 109,531 |  |  | (965) |  |  | 297,191 |  |
| Bond mutual funds | 350,165 |  |  | 1,662 |  |  | (67,456) |  |  | 284,371 |  |
| Total equity securities | $ | 547,443 |  |  | $ | 111,412 |  |  | $ | (68,956) |  |  | $ | 589,899 |  |
| At December 31, 2023 |  |  |  |  |  |  |  |
| Equity securities |  |  |  |  |  |  |  |
| Common stocks | $ | 2,843 |  |  | $ | 101 |  |  | $ | (398) |  |  | $ | 2,546 |  |
| Preferred stocks | 5,496 |  |  | 218 |  |  | (113) |  |  | 5,601 |  |
| Exchange-traded funds | 182,989 |  |  | 105,858 |  |  | (1,572) |  |  | 287,275 |  |
| Bond mutual funds | 352,505 |  |  | 4,119 |  |  | (63,535) |  |  | 293,089 |  |
| Total equity securities | $ | 543,833 |  |  | $ | 110,296 |  |  | $ | (65,618) |  |  | $ | 588,511 |  |
d) Mortgage Loans The following table provides details of the Company's mortgage loans, held for investment:
|  | June 30, 2024 |  | December 31, 2023 |
|  | Carrying value |  | % of Total |  | Carrying value |  | % of Total |
| Mortgage loans, held for investment: |  |  |  |  |  |  |  |
| Commercial | $ | 565,540 |  |  | 104 | % |  | $ | 616,368 |  |  | 101 | % |
| Allowance for expected credit losses | (20,681) |  |  | (4 | %) |  | (6,220) |  |  | (1) | % |
| Total mortgage loans, held for investment | $ | 544,859 |  |  | 100 | % |  | $ | 610,148 |  |  | 100 | % |
The primary credit quality indicators for commercial mortgage loans are the debt service coverage ratio which compares a property’s net operating income to amounts needed to service the principal and interest due under the loan, (generally, the lower the debt service coverage ratio, the higher the risk of experiencing a credit loss) and the loan-to-value ratio which compares the unpaid principal balance of the loan to the estimated fair value of the underlying collateral (generally, the higher the loan-to-value ratio, the higher the risk of experiencing a credit loss). The debt service coverage ratio and loan-to-value ratio, as well as the values utilized in calculating these ratios, are updated quarterly. The Company has a high quality commercial mortgage loan portfolio with a weighted average debt service coverage ratio of 1.9x (2023: 1.9x) and a weighted average loan-to-value ratio of 74% (2023: 71%). At June 30, 2024, and 2023 there were no past due amounts associated with the commercial mortgage loans held by the Company. On a quarterly basis the Company's exposure to commercial mortgage loans in the office sector, which represents 43% (2023: 41%) of the total mortgage loan portfolio, is evaluated for credit losses based on inputs unique to this sector. This assessment utilizes historical credit loss experience adjusted to reflect current conditions and management forecasts. Further, collateral dependent commercial mortgage loans (e.g., when the borrower is experiencing financial difficulty, including when foreclosure is reasonably possible or probable) are evaluated individually for credit losses. The allowance for expected credit losses for a collateral dependent loan is established as the excess of amortized cost over the estimated fair value of the loan's underlying collateral, less selling cost when foreclosure is probable. Accordingly, any change in estimated credit losses are recognized as a change in the allowance for expected credit losses which is recorded in net investment gains (losses). At June 30, 2024, the Company's mortgage loan portfolio had an allowance for expected credit loss of $21 million (2023: $6 million). e) Other Investments The following table provides a summary of the Company's other investments, together with additional information relating to the liquidity of each category:
|  | Fair value |  | Redemption frequency (if currently eligible) |  | Redemption notice period |
| At June 30, 2024 |  |  |  |  |  |  |  |
| Multi-strategy funds | $ | 24,634 |  |  | 3 | % |  | Quarterly |  | 60-90 days |
| Direct lending funds | 167,137 |  |  | 18 | % |  | Quarterly(1) |  | 90 days |
| Private equity funds | 318,608 |  |  | 34 | % |  | n/a |  | n/a |
| Real estate funds | 309,793 |  |  | 33 | % |  | Quarterly(2), Annually(3) |  | 45-90 days |
| CLO-Equities | 4,498 |  |  | — | % |  | n/a |  | n/a |
| Other privately held investments | 112,010 |  |  | 12 | % |  | n/a |  | n/a |
| Total other investments | $ | 936,680 |  |  | 100 | % |  |  |  |  |
| At December 31, 2023 |  |  |  |  |  |  |  |
| Multi-strategy funds | $ | 24,619 |  |  | 3 | % |  | Quarterly |  | 60-90 days |
| Direct lending funds | 192,270 |  |  | 20 | % |  | Quarterly(1) |  | 90 days |
| Private equity funds | 301,712 |  |  | 32 | % |  | n/a |  | n/a |
| Real estate funds | 317,325 |  |  | 33 | % |  | Quarterly(2), Annually(3) |  | 45-90 days |
| CLO-Equities | 5,300 |  |  | 1 | % |  | n/a |  | n/a |
| Other privately held investments | 108,187 |  |  | 11 | % |  | n/a |  | n/a |
| Total other investments | $ | 949,413 |  |  | 100 | % |  |  |  |  |
n/a - not applicable (1) Applies to one fund with a fair va lue of $10 million (2023: $17 million). (2) Applies to one fund with a fair value of $61 million (2023: $66 million). (3) Applies to one fund with a fair value of $23 million (2023: $25 million). Two common redemption restrictions which may impact the Company's ability to redeem multi-strategy funds are gates and lockups. A gate is a suspension of redemptions which may be implemented by the general partner or investment manager of the fund in order to defer, in whole or in part, the redemption request in the event the aggregate amount of redemption requests exceeds a predetermined percentage of the fund's net assets which may otherwise hinder the general partner or investment manager's ability to liquidate holdings in an orderly fashion in order to generate the cash necessary to fund extraordinarily large redemption payouts. A lockup period is the initial amount of time an investor is contractually required to hold the security before having the ability to redeem. During the six months ended June 30, 2024 and 2023, neither of these restrictions impacted the Company's redemption requests. At June 30, 2024, there w ere no multi-strategy fund holdings (2023: $nil) where the Company is still within the lockup period. At June 30, 2024, the Company h ad $28 million (2023: $28 million) of unfunded commitments as a limited partner in multi-strategy hedge funds. Once the full amount of committed capital has been called by the General Partner of each of these funds, the assets will not be fully returned until after the completion of the funds' investment term. These funds have investment terms ranging from two years to the dissolution of the underlying fund. At June 30, 2024, the Company had $272 million (2023: $192 million) of unfunded commitments as a limited partner in direct lending funds. Once the full amount of committed capital has been called by the General Partner of each of these funds, the assets will not be fully returned until the completion of the fund's investment term. These funds have investment terms ranging from four to ten years and the General Partners of certain funds have the option to extend the term by up to three years. At June 30, 2024, the Company had $123 million (2023: $145 million) of unfunded commitments as a limited partner in private equity funds. The life of the funds is subject to the dissolution of the underlying funds. The Company expects the overall holding period to be over six years. At June 30, 2024, the Company had $98 million (2023: $107 million) of unfunded commitments as a limited partner in real estate funds. These funds include an open-ended fund and funds with investment terms ranging from two years to the dissolution of the underlying fund. At June 30, 2024, the Company had $23 million (2023: $30 million) of unfunded commitments as a limited partner in three private company investment funds focusing on financial services technology companies with an emphasis on insurance technology companies ("private company investment funds"). Two of these funds have investment terms of 5 years and one fund has an investment term of 10 years. f) Equity Method Investments During 2023, the Company paid $22 million to acquire 18% of the common equity of Monarch Point Re (ISAC) Ltd. and Monarch Point Re (ISA 2023) Ltd., a collateralized reinsurance company formed under the laws of Bermuda as an incorporated segregated accounts company under the Incorporated Segregated Accounts Companies Act 2019, as amended (the "ISAC Act"). During 2024, the Company paid $10 million to acquire 18% of the common equity of Monarch Point Re (ISA 2024) Ltd., (Monarch Point Re (ISAC) Ltd., Monarch Point Re (ISA 2023) Ltd. and Monarch Point Re (ISA 2024) Ltd., individually or collectively "Monarch Point Re"). Monarch Point Re is an independent reinsurer jointly sponsored by the Company and Stone Point Credit, LLC ("Stone Point"). The Company retrocedes a diversified portfolio of casualty reinsurance business to Monarch Point Re and Stone Point serves as its investment manager. As an investor, the Company expects to benefit from underwriting fees generated by Monarch Point Re and the income and capital appreciation Stone Point seeks to deliver through its investment management services. Monarch Point Re is not a Variable Interest Entity ("VIE") that is required to be included in the Company's consolidated financial statements. The Company accounts for its ownership interest in Monarch Point Re under the equity method of accounting. During 2016, the Company paid $108 million including direct transaction costs to acquire 19% of the common equity of Harrington Reinsurance Holdings Limited ("Harrington"), the parent company of Harrington Re Ltd. ("Harrington Re"), an independent reinsurance company jointly sponsored by the Company and The Blackstone Group L.P. ("Blackstone"). During 2023, following a share tender offer, the Company's ownership interest in Harrington increased to 20%. Through long-term service agreements, the Company serves as Harrington Re's reinsurance underwriting manager and Blackstone serves as exclusive investment management service provider. As an investor, the Company expects to benefit from underwriting profit generated by Harrington Re and the income and capital appreciation Blackstone seeks to deliver through its investment management services. In addition, the Company has entered into an arrangement with Blackstone under which underwriting and investment related fees will be shared equally. Harrington is not a VIE that is required to be included in the Company's consolidated financial statements. The Company accounts for its ownership interest in Harrington under the equity method of accounting. The Company's proportionate share of the underlying equity in net assets resulted in a basis difference of $5 million which represents initial transactions costs. g) Variable Interest Entities In the normal course of investing activities, the Company actively manages allocations to non-controlling tranches of structured securities which are variable interests issued by VIEs. These structured securities include RMBS, CMBS and ABS. The Company also invests in limited partnerships which represent 75% of the Company's other investments. The investments in limited partnerships include multi-strategy funds, direct lending funds, private equity funds, real estate funds and CLO equity tranched securities, which are variable interests issued by VIEs (refer to Note 4(e) 'Other Investments'). The Company does not have the power to direct the activities that are most significant to the economic performance of these VIEs. Therefore, the Company is not the primary beneficiary of these VIEs. The maximum exposure to loss on these interests is limited to the amount of commitment made by the Company. The Company has not provided financial or other support to these structured securities other than the original investment. h) Net Investment Income Net investment income was derived from the following sources:
|  | Three months ended June 30, |  | Six months ended June 30, |
|  | 2024 |  | 2023 |  | 2024 |  | 2023 |
| Fixed maturities | $ | 154,023 |  |  | $ | 124,390 |  |  | $ | 293,419 |  |  | $ | 242,652 |  |
| Other investments | 14,301 |  |  | (5,341) |  |  | 19,974 |  |  | (4,855) |  |
| Equity securities | 3,057 |  |  | 2,990 |  |  | 5,819 |  |  | 5,445 |  |
| Mortgage loans | 9,108 |  |  | 8,880 |  |  | 18,237 |  |  | 17,266 |  |
| Cash and cash equivalents | 13,733 |  |  | 11,161 |  |  | 27,395 |  |  | 21,174 |  |
| Short-term investments | 3,766 |  |  | 2,129 |  |  | 7,229 |  |  | 3,789 |  |
| Gross investment income | 197,988 |  |  | 144,209 |  |  | 372,073 |  |  | 285,471 |  |
| Investment expenses | (7,013) |  |  | (7,380) |  |  | (13,715) |  |  | (14,870) |  |
| Net investment income | $ | 190,975 |  |  | $ | 136,829 |  |  | $ | 358,358 |  |  | $ | 270,601 |  |
i) Net Investment Gains (Losses) The following table provides an analysis of net investment gains (losses):
|  |  | Three months ended June 30, |  | Six months ended June 30, |  |  |  |
|  |  | 2024 |  | 2023 |  | 2024 |  | 2023 |  |  |  |  |  |
|  | Gross realized investment gains |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Fixed maturities and short-term investments | $ | 6,182 |  |  | $ | 11,460 |  |  | $ | 20,581 |  |  | $ | 23,829 |  |  |  |  |  |  |
|  | Equity securities | — |  |  | 17 |  |  | 30,626 |  |  | 1,535 |  |  |  |  |  |  |
|  | Gross realized investment gains | 6,182 |  |  | 11,477 |  |  | 51,207 |  |  | 25,364 |  |  |  |  |  |  |
|  | Gross realized investment losses |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Fixed maturities and short-term investments | (52,587) |  |  | (43,695) |  |  | (96,519) |  |  | (97,343) |  |  |  |  |  |  |
|  | Equity securities | — |  |  | — |  |  | (7,712) |  |  | (396) |  |  |  |  |  |  |
|  | Gross realized investment losses | (52,587) |  |  | (43,695) |  |  | (104,231) |  |  | (97,739) |  |  |  |  |  |  |
|  | (Increase) decrease in allowance for expected credit losses, fixed maturities, available for sale | (394) |  |  | 2,094 |  |  | 6,128 |  |  | 1,182 |  |  |  |  |  |  |
|  | (Increase) decrease in allowance for expected credit losses, mortgage loans | (12,569) |  |  | (1,740) |  |  | (14,428) |  |  | (3,638) |  |  |  |  |  |  |
|  | Impairment losses(1) | (156) |  |  | (9,083) |  |  | (164) |  |  | (9,083) |  |  |  |  |  |  |
|  | Change in fair value of investment derivatives(2) | 228 |  |  | (528) |  |  | 1,023 |  |  | (1,474) |  |  |  |  |  |  |
|  | Net unrealized gains (losses) on equity securities | 5,817 |  |  | 17,105 |  |  | (2,222) |  |  | 40,830 |  |  |  |  |  |  |
|  | Net investment losses | $ | (53,479) |  |  | $ | (24,370) |  |  | $ | (62,687) |  |  | $ | (44,558) |  |  |  |  |  |  |
(1) Related to instances where the Company intends to sell securities or it is more likely than not that the Company will be required to sell securities before their anticipated recovery. (2) Refer to Note 6 'Derivative Instruments'. The following table provides a reconciliation of the beginning and ending balances of the allowance for expected credit losses on fixed maturities classified as available for sale:
|  |  | Three months ended June 30, |  |  |  |  | Six months ended June 30, |
|  |  | 2024 |  | 2023 |  |  |  |  |  |  | 2024 |  | 2023 |
|  | Balance at beginning of period | $ | 4,237 |  |  | $ | 12,645 |  |  |  |  |  |  |  | $ | 10,759 |  |  | $ | 11,733 |  |
|  | Expected credit losses on securities where credit losses were not previously recognized | 247 |  |  | 3,742 |  |  |  |  |  |  |  | 278 |  |  | 4,355 |  |
|  | Additions (reductions) for expected credit losses on securities where credit losses were previously recognized | 147 |  |  | (1,223) |  |  |  |  |  |  |  | (1,406) |  |  | (304) |  |
|  | Impairments of securities which the Company intends to sell or more likely than not will be required to sell | — |  |  | — |  |  |  |  |  |  |  | — |  |  | — |  |
|  | Securities sold/redeemed/matured | — |  |  | (4,613) |  |  |  |  |  |  |  | (5,000) |  |  | (5,233) |  |
|  | Balance at end of period | $ | 4,631 |  |  | $ | 10,551 |  |  |  |  |  |  |  | $ | 4,631 |  |  | $ | 10,551 |  |
j) Reverse Repurchase Agreements At June 30, 2024, the Company held $45 million (2023: $12 million) of reverse repurchase agreements. These loans are fully collateralized, are generally outstanding for a short period of time and are presented on a gross basis as part of cash and cash equivalents in the Company's consolidated balance sheets. The required collateral for these loans is either cash or U.S. Treasuries at a minimum rate of 102% of the loan principal. Upon maturity, the Company receives principal and interest income. The Company monitors the estimated fair value of the securities loaned and borrowed on a daily basis with additional collateral obtained as necessary throughout the duration of the transaction.

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