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Investments
9 Months Ended
Sep. 30, 2024
Investments [Abstract]  
Investments Investments
(a) Information regarding our AFS securities as of September 30, 2024 and December 31, 2023, were as follows:

September 30, 2024Cost/
Amortized
Cost
Allowance for Credit LossesUnrealized
Gains
Unrealized
Losses
Fair
Value
($ in thousands)
AFS fixed income securities:
U.S. government and government agencies$139,877  106 (14,581)125,402 
Foreign government10,671 (24) (985)9,662 
Obligations of states and political subdivisions512,086 (472)2,865 (21,623)492,856 
Corporate securities3,067,267 (12,034)58,570 (87,018)3,026,785 
Collateralized loan obligations ("CLO") and other asset-backed securities ("ABS")1,971,489 (4,462)28,036 (48,670)1,946,393 
Residential mortgage-backed securities ("RMBS")
1,801,760 (11,509)13,319 (63,561)1,740,009 
Commercial mortgage-backed securities ("CMBS")766,188 (3)4,819 (23,510)747,494 
Total AFS fixed income securities$8,269,338 (28,504)107,715 (259,948)8,088,601 
December 31, 2023Cost/
Amortized
Cost
Allowance for Credit LossesUnrealized
Gains
Unrealized
Losses
Fair
Value
($ in thousands)
AFS fixed income securities:
U.S. government and government agencies$223,157 — 139 (18,261)205,035 
Foreign government11,140 (35)— (1,302)9,803 
Obligations of states and political subdivisions612,938 (669)2,623 (28,927)585,965 
Corporate securities2,834,048 (12,999)28,078 (137,888)2,711,239 
CLO and other ABS1,911,831 (2,854)11,855 (86,005)1,834,827 
RMBS1,568,960 (11,649)6,023 (85,851)1,477,483 
CMBS718,623 (6)1,358 (45,130)674,845 
Total AFS fixed income securities$7,880,697 (28,212)50,076 (403,364)7,499,197 

The following tables provide a roll forward of the allowance for credit losses on our AFS fixed income securities for the indicated periods:

Quarter ended September 30, 2024Beginning BalanceCurrent Provision for Securities without Prior AllowanceInitial Allowance for Purchased Credit Deteriorated Assets with Credit DeteriorationIncrease (Decrease) on Securities with Prior Allowance, excluding intent (or Requirement) to Sell SecuritiesReductions for Securities SoldReductions for Securities Identified as Intent (or Requirement) to Sell during the PeriodEnding Balance
($ in thousands)
Foreign government$26   (2)  24 
Obligations of states and political subdivisions639 107  (266)(8) 472 
Corporate securities15,950 747  (4,231)(432) 12,034 
CLO and other ABS3,022 1,575  (49)(86) 4,462 
RMBS11,660   (63)(88) 11,509 
CMBS12   (9)  3 
Total AFS fixed income securities$31,309 2,429  (4,620)(614) 28,504 

Quarter ended September 30, 2023Beginning BalanceCurrent Provision for Securities without Prior AllowanceInitial Allowance for Purchased Credit Deteriorated Assets with Credit DeteriorationIncrease (Decrease) on Securities with Prior Allowance, excluding intent (or Requirement) to Sell SecuritiesReductions for Securities SoldReductions for Securities Identified as Intent (or Requirement) to Sell during the PeriodEnding Balance
($ in thousands)
Foreign government$34 — — (2)— — 32 
Obligations of states and political subdivisions769 96 — 55 (28)— 892 
Corporate securities16,149 1,939 — (111)(212)— 17,765 
CLO and other ABS2,915 148 — 167 (12)— 3,218 
RMBS11,550 23 — 154 (102)— 11,625 
CMBS— — (1)(1)— 
Total AFS fixed income securities$31,425 2,206 — 262 (355)— 33,538 

Nine Months ended September 30, 2024Beginning BalanceCurrent Provision for Securities without Prior AllowanceInitial Allowance for Purchased Credit Deteriorated Assets with Credit DeteriorationIncrease (Decrease) on Securities with Prior Allowance, excluding intent (or Requirement) to Sell SecuritiesReductions for Securities SoldReductions for Securities Identified as Intent (or Requirement) to Sell during the PeriodEnding Balance
($ in thousands)
Foreign government$35   (4)(7) 24 
Obligations of states and political subdivisions669 118  (299)(16) 472 
Corporate securities12,999 1,325  (1,282)(999)(9)12,034 
CLO and other ABS2,854 1,886  (188)(90) 4,462 
RMBS11,649   139 (279) 11,509 
CMBS6   (3)  3 
Total AFS fixed income securities$28,212 3,329  (1,637)(1,391)(9)28,504 
Nine Months ended September 30, 2023Beginning BalanceCurrent Provision for Securities without Prior AllowanceInitial Allowance for Purchased Credit Deteriorated Assets with Credit DeteriorationIncrease (Decrease) on Securities with Prior Allowance, excluding intent (or Requirement) to Sell SecuritiesReductions for Securities SoldReductions for Securities Identified as Intent (or Requirement) to Sell during the PeriodEnding Balance
($ in thousands)
Foreign government$284 — — (252)— — 32 
Obligations of states and political subdivisions1,024 100 — (120)(112)— 892 
Corporate securities30,330 6,078 — (14,992)(3,600)(51)17,765 
CLO and other ABS2,375 904 — (40)(21)— 3,218 
RMBS11,597 24 — 334 (330)— 11,625 
CMBS111 — 38 (144)— 
Total AFS fixed income securities$45,721 7,107 — (15,032)(4,207)(51)33,538 

During Nine Months 2024 and Nine Months 2023, we had no write-offs or recoveries of our AFS fixed income securities.

For information on our methodology and significant inputs used to measure expected credit losses, our accounting policy for recognizing write-offs of uncollectible amounts, and our treatment of accrued interest, refer to Note 2. "Summary of Significant Accounting Policies" in Item 8. "Financial Statements and Supplementary Data." of our 2023 Annual Report. Accrued interest on AFS securities was $68.9 million as of September 30, 2024, and $64.6 million as of December 31, 2023. We did not record any write-offs of accrued interest in Nine Months 2024 and Nine Months 2023.

(b) Quantitative information about unrealized losses on our AFS portfolio follows:

September 30, 2024Less than 12 months12 months or longerTotal
($ in thousands)Fair ValueUnrealized
Losses
Fair ValueUnrealized
Losses
Fair ValueUnrealized
Losses
AFS fixed income securities:    
U.S. government and government agencies$352 (36)110,409 (14,545)110,761 (14,581)
Foreign government  9,662 (985)9,662 (985)
Obligations of states and political subdivisions49,972 (322)264,599 (21,301)314,571 (21,623)
Corporate securities164,625 (1,246)1,158,745 (85,772)1,323,370 (87,018)
CLO and other ABS264,653 (5,352)657,379 (43,318)922,032 (48,670)
RMBS233,580 (966)727,552 (62,595)961,132 (63,561)
CMBS27,946 (107)451,713 (23,403)479,659 (23,510)
Total AFS fixed income securities$741,128 (8,029)3,380,059 (251,919)4,121,187 (259,948)

December 31, 2023Less than 12 months12 months or longerTotal
($ in thousands)Fair
Value
Unrealized
Losses
Fair ValueUnrealized
Losses
Fair ValueUnrealized
Losses
AFS fixed income securities:    
U.S. government and government agencies$77,698 (188)108,578 (18,073)186,276 (18,261)
Foreign government1,552 (87)8,251 (1,215)9,803 (1,302)
Obligations of states and political subdivisions137,031 (962)290,964 (27,965)427,995 (28,927)
Corporate securities263,423 (6,369)1,439,422 (131,519)1,702,845 (137,888)
CLO and other ABS278,940 (7,120)984,175 (78,885)1,263,115 (86,005)
RMBS351,976 (4,765)757,914 (81,086)1,109,890 (85,851)
CMBS130,189 (2,995)471,256 (42,135)601,445 (45,130)
Total AFS fixed income securities$1,240,809 (22,486)4,060,560 (380,878)5,301,369 (403,364)

We currently do not intend to sell any of the securities summarized in the tables above, nor do we believe we will be required to sell any of them. Considering these factors and our review of these securities under our credit loss policy as described in Note 2. "Summary of Significant Accounting Policies" in Item 8. "Financial Statements and Supplementary Data." of our 2023 Annual Report, we have concluded that no additional allowance for credit loss is required on these balances beyond the allowance for credit loss recorded as of September 30, 2024. This conclusion reflects our current judgment about the financial position and future prospects of the entities that issued the investment security and underlying collateral.
(c) AFS and held-to-maturity ("HTM") fixed income securities at September 30, 2024, by contractual maturity are shown below. The maturities of RMBS, CMBS, CLO and other ABS securities were calculated using each security's estimated average life. Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties.
 
AFSHTM
($ in thousands)Fair ValueCarrying ValueFair Value
Due in one year or less$623,583 820 833 
Due after one year through five years3,638,555 13,971 13,574 
Due after five years through 10 years3,030,532 7,167 7,033 
Due after 10 years795,931   
Total fixed income securities$8,088,601 21,958 21,440 

(d) The following table summarizes our alternative investment portfolio by strategy:

September 30, 2024December 31, 2023
($ in thousands)Carrying ValueRemaining CommitmentMaximum Exposure to LossCarrying ValueRemaining CommitmentMaximum Exposure to Loss
Alternative Investments  
   Private equity$337,905 191,411 529,316 301,759 131,885 433,644 
   Private credit50,236 96,702 146,938 54,500 89,401 143,901 
   Real assets43,858 41,439 85,297 39,520 33,040 72,560 
Total alternative investments$431,999 329,552 761,551 395,779 254,326 650,105 

We are contractually committed to make additional investments up to the remaining commitments stated above. We did not provide any non-contractual financial support during 2024 or 2023.

The following table shows gross summarized financial information for our alternative investments portfolio, including the portion we do not own. As the majority of these investments report results to us on a one quarter lag, the summarized financial statement information is for 3- and 9-month periods ended June 30:

Income Statement InformationQuarter ended September 30,Nine Months ended September 30
($ in millions)2024202320242023
Net investment income (loss)$230.6 74.3 $127.0 (66.9)
Realized gains1,878.3 1,108.5 5,263.4 3,752.8 
Net change in unrealized appreciation (depreciation)607.7 2,216.3 7,277.0 7,414.1 
Net income$2,716.6 3,399.1 $12,667.4 11,100.0 
Alternative investment income included in "Net investment income earned" on our Consolidated Statements of Income$9.0 6.5 $26.4 25.6 

(e) We have pledged certain AFS fixed income securities as collateral related to our borrowing relationships with the Federal Home Loan Bank of Indianapolis ("FHLBI") and the Federal Home Loan Bank of New York ("FHLBNY"). In addition, we had certain securities on deposit with various state and regulatory agencies at September 30, 2024 to comply with insurance laws. We retain all rights regarding all securities pledged as collateral.

The following table summarizes the market value of these securities at September 30, 2024:

($ in millions)FHLBI CollateralFHLBNY CollateralState and
Regulatory Deposits
Total
U.S. government and government agencies$  22.0 22.0 
Obligations of states and political subdivisions  3.2 3.2 
RMBS65.9 23.4  89.3 
CMBS1.8 8.4  10.2 
Total pledged as collateral$67.7 31.8 25.2 124.7 

(f) We did not have exposure to any credit concentration risk of a single issuer greater than 10% of our stockholders' equity, other than to certain U.S. government agencies, as of September 30, 2024, or December 31, 2023.
(g) The components of pre-tax net investment income earned were as follows:

 Quarter ended
September 30,
Nine Months ended
September 30,
($ in thousands)2024202320242023
Fixed income securities$98,464 90,013 $286,501 254,016 
Commercial mortgage loans ("CMLs")3,238 2,516 9,177 6,680 
Equity securities5,362 2,083 12,147 5,524 
Short-term investments6,457 3,941 14,656 11,483 
Alternative investments9,031 6,473 26,429 25,637 
Other investments251 284 632 515 
Investment expenses(5,044)(4,447)(15,292)(13,790)
Net investment income earned$117,759 100,863 $334,250 290,065 

The increase in net investment income earned in Third Quarter 2024 and Nine Months 2024 compared to the same prior-year periods was primarily driven by higher interest rates, active portfolio management, and operating cash flow deployment.

(h) The following table summarizes net realized and unrealized investment gains and losses for the periods indicated:

Quarter ended
September 30,
Nine Months ended
September 30,
($ in thousands)2024202320242023
Gross gains on sales$4,159 367 $10,681 5,307 
Gross losses on sales(2,012)(5,264)(5,228)(30,146)
Net realized gains (losses) on disposals2,147 (4,897)5,453 (24,839)
Net unrealized gains (losses) on equity securities2,407 489 3,006 8,662 
Net credit loss benefit (expense) on fixed income securities, AFS2,191 (2,468)(1,692)7,925 
Net credit loss benefit (expense) on CMLs
(2)(4)134 (65)
Losses on securities for which we have the intent to sell(752)— (1,248)(645)
Other realized gains (losses)
(602)— (602)— 
Net realized and unrealized investment gains (losses)$5,389 (6,880)$5,051 (8,962)

Net unrealized gains and losses recognized in income on equity securities, as reflected in the table above, included the following:

Quarter ended
September 30,
Nine Months ended
September 30,
($ in thousands)2024202320242023
Unrealized gains (losses) recognized in income on equity securities:
On securities remaining in our portfolio at end of period$1,997 200 $4,904 2,744 
On securities sold in period410 289 (1,898)5,918 
Total unrealized gains (losses) recognized in income on equity securities$2,407 489 $3,006 8,662