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Investments (Tables)

9 Months Ended

Sep. 30, 2023

Schedule of Investments [Line Items]

Schedule of Available-for-sale Securities

September 30, 2023						Cost/ Amortized Cost						Allowance for Credit Losses						Unrealized Gains						Unrealized Losses						Fair Value
($ in thousands)
AFS fixed income securities:
U.S. government and government agencies						$	253,174					—						—						(26,445)						226,729
Foreign government						11,155						(32)						—						(1,807)						9,316
Obligations of states and political subdivisions						672,075						(892)						125						(56,557)						614,751
Corporate securities						2,684,453						(17,765)						2,003						(228,556)						2,440,135
Collateralized loan obligations ("CLO") and other asset-backed securities ("ABS")						1,819,454						(3,218)						4,144						(106,665)						1,713,715
Residential mortgage-backed securities ("RMBS")						1,548,758						(11,625)						500						(153,174)						1,384,459
Commercial mortgage-backed securities ("CMBS")						700,281						(6)						—						(62,276)						637,999
Total AFS fixed income securities						$	7,689,350					(33,538)						6,772						(635,480)						7,027,104

December 31, 2022						Cost/ Amortized Cost						Allowance for Credit Losses						Unrealized Gains						Unrealized Losses						Fair Value
($ in thousands)
AFS fixed income securities:
U.S. government and government agencies						$	209,528					—						37						(20,326)						189,239
Foreign government						11,199						(284)						—						(1,307)						9,608
Obligations of states and political subdivisions						965,231						(1,024)						1,812						(48,001)						918,018
Corporate securities						2,558,655						(30,330)						3,509						(196,809)						2,335,025
CLO and other ABS						1,607,660						(2,375)						2,408						(121,720)						1,485,973
RMBS						1,169,546						(11,597)						1,148						(99,265)						1,059,832
CMBS						663,935						(111)						348						(49,760)						614,412
Total AFS fixed income securities						$	7,185,754					(45,721)						9,262						(537,188)						6,612,107

Debt Securities, Available-for-sale, Allowance for Credit Loss

Quarter ended September 30, 2023						Beginning Balance						Current Provision for Securities without Prior Allowance						Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration						Increase (Decrease) on Securities with Prior Allowance, excluding intent (or Requirement) to Sell Securities						Reductions for Securities Sold						Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period						Ending Balance
($ in thousands)
Foreign government						$	34					—						—						(2)						—						—						32
Obligations of states and political subdivisions						769						96						—						55						(28)						—						892
Corporate securities						16,149						1,939						—						(111)						(212)						—						17,765
CLO and other ABS						2,915						148						—						167						(12)						—						3,218
RMBS						11,550						23						—						154						(102)						—						11,625
CMBS						8						—						—						(1)						(1)						—						6
Total AFS fixed income securities						$	31,425					2,206						—						262						(355)						—						33,538

Quarter ended September 30, 2022						Beginning Balance						Current Provision for Securities without Prior Allowance						Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration						Increase (Decrease) on Securities with Prior Allowance, excluding intent (or Requirement) to Sell Securities						Reductions for Securities Sold						Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period						Ending Balance
($ in thousands)
Foreign government						$	265					40						—						15						—						—						320
Obligations of states and political subdivisions						1,206						313						—						(181)						(27)						—						1,311
Corporate securities						35,072						4,061						—						633						(2,733)						(63)						36,970
CLO and other ABS						3,623						35						—						(527)						(17)						—						3,114
RMBS						10,616						35						—						46						(94)						—						10,603
CMBS						18						—						—						1						—						—						19
Total AFS fixed income securities						$	50,800					4,484						—						(13)						(2,871)						(63)						52,337

Nine Months ended September 30, 2023						Beginning Balance						Current Provision for Securities without Prior Allowance						Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration						Increase (Decrease) on Securities with Prior Allowance, excluding intent (or Requirement) to Sell Securities						Reductions for Securities Sold						Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period						Ending Balance
($ in thousands)
Foreign government						$	284					—						—						(252)						—						—						32
Obligations of states and political subdivisions						1,024						100						—						(120)						(112)						—						892
Corporate securities						30,330						6,078						—						(14,992)						(3,600)						(51)						17,765
CLO and other ABS						2,375						904						—						(40)						(21)						—						3,218
RMBS						11,597						24						—						334						(330)						—						11,625
CMBS						111						1						—						38						(144)						—						6
Total AFS fixed income securities						$	45,721					7,107						—						(15,032)						(4,207)						(51)						33,538

Nine Months ended September 30, 2022						Beginning Balance						Current Provision for Securities without Prior Allowance						Initial Allowance for Purchased Credit Deteriorated Assets with Credit Deterioration						Increase (Decrease) on Securities with Prior Allowance, excluding intent (or Requirement) to Sell Securities						Reductions for Securities Sold						Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period						Ending Balance
($ in thousands)
Foreign government						$	46					292						—						(4)						(14)						—						320
Obligations of states and political subdivisions						137						1,371						—						(6)						(191)						—						1,311
Corporate securities						6,682						33,096						—						4,384						(5,925)						(1,267)						36,970
CLO and other ABS						939						1,580						—						623						(28)						—						3,114
RMBS						1,909						225						8,318						473						(322)						—						10,603
CMBS						11						18						—						(10)						—						—						19
Total AFS fixed income securities						$	9,724					36,582						8,318						5,460						(6,480)						(1,267)						52,337

Schedule of Fair Value and Gross Pre-Tax Net Unrealized Loss of Securities by Length of Time, AFS

September 30, 2023						Less than 12 months												12 months or longer												Total
($ in thousands)						Fair Value						Unrealized Losses						Fair Value						Unrealized Losses						Fair Value						Unrealized Losses
AFS fixed income securities:
U.S. government and government agencies						$	126,898					(1,428)						99,831						(25,017)						226,729						(26,445)
Foreign government						1,528						(122)						7,788						(1,685)						9,316						(1,807)
Obligations of states and political subdivisions						307,144						(8,921)						282,238						(47,636)						589,382						(56,557)
Corporate securities						808,733						(27,732)						1,392,386						(200,824)						2,201,119						(228,556)
CLO and other ABS						522,941						(13,560)						1,014,419						(93,105)						1,537,360						(106,665)
RMBS						609,952						(28,785)						725,818						(124,389)						1,335,770						(153,174)
CMBS						182,481						(8,363)						455,518						(53,913)						637,999						(62,276)
Total AFS fixed income securities						$	2,559,677					(88,911)						3,977,998						(546,569)						6,537,675						(635,480)

December 31, 2022						Less than 12 months												12 months or longer												Total
($ in thousands)						Fair Value						Unrealized Losses						Fair Value						Unrealized Losses						Fair Value						Unrealized Losses
AFS fixed income securities:
U.S. government and government agencies						$	166,975					(13,658)						16,011						(6,668)						182,986						(20,326)
Foreign government						5,573						(608)						2,456						(699)						8,029						(1,307)
Obligations of states and political subdivisions						681,795						(43,767)						16,618						(4,234)						698,413						(48,001)
Corporate securities						1,889,492						(164,197)						133,223						(32,612)						2,022,715						(196,809)
CLO and other ABS						916,423						(69,155)						411,283						(52,565)						1,327,706						(121,720)
RMBS						887,229						(76,432)						108,041						(22,833)						995,270						(99,265)
CMBS						512,953						(37,815)						77,181						(11,945)						590,134						(49,760)
Total AFS fixed income securities						$	5,060,440					(405,632)						764,813						(131,556)						5,825,253						(537,188)

Schedule of Fixed Maturity Securities By Contractual Maturities

						AFS						HTM
($ in thousands)						Fair Value						Carrying Value						Fair Value
Due in one year or less						$	428,247					224						223
Due after one year through five years						3,197,277						13,833						13,179
Due after five years through 10 years						2,463,374						9,183						8,490
Due after 10 years						938,206						—						—
Total fixed income securities						$	7,027,104					23,240						21,892

Schedule of Other Investment Portfolio By Strategy And Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy

						September 30, 2023																		December 31, 2022
($ in thousands)						Carrying Value						Remaining Commitment						Maximum Exposure to Loss						Carrying Value						Remaining Commitment						Maximum Exposure to Loss
Alternative Investments
Private equity						$	306,357					138,325						444,682						280,980						134,676						415,656
Private credit						102,373						89,809						192,182						54,866						89,481						144,347
Real assets						38,075						19,161						57,236						35,470						21,945						57,415
Total alternative investments						$	446,805					247,295						694,100						371,316						246,102						617,418

Schedule of Aggregated Summarized Income Statement Financial Information For Partnerships In Our Alternative Investment Portfolio

Income Statement Information						Quarter ended September 30,												Nine Months ended September 30,
($ in millions)						2023						2022						2023						2022
Net investment income (loss)						$	74.3					205.6						$	(66.9)					612.0
Realized gains						1,108.5						1,983.5						3,752.8						10,964.9
Net change in unrealized appreciation (depreciation)						2,216.3						(3,188.9)						7,414.1						(1,973.0)
Net income						$	3,399.1					(999.8)						$	11,100.0					9,603.9
Alternative investment income included in "Net investment income earned" on our Consolidated Statements of Income						$	6.5					(5.6)						$	25.6					22.8

Schedule of Securities Pledged As Collateral

($ in millions)						FHLBI Collateral						FHLBNY Collateral												State and Regulatory Deposits						Total
U.S. government and government agencies						$	—					—												18.7						18.7
Obligations of states and political subdivisions						—						—												3.5						3.5
RMBS						61.7						24.7												—						86.4
CMBS						2.5						8.5												—						11.0
Total pledged as collateral						$	64.2					33.2												22.2						119.6

Schedule of Pre-Tax Net Investment Income Earned

						Quarter ended September 30,												Nine Months ended September 30,
($ in thousands)						2023						2022						2023						2022
Fixed income securities						$	90,013					68,236						$	254,016					184,305
Commercial mortgage loans ("CMLs")						2,516						1,600						6,680						3,762
Equity securities						2,083						2,604						5,524						7,661
Short-term investments						3,941						1,152						11,483						1,660
Alternative investments						6,473						(5,581)						25,637						22,821
Other investments						284						112						515						75
Investment expenses						(4,447)						(4,234)						(13,790)						(13,571)
Net investment income earned						$	100,863					63,889						$	290,065					206,713

Schedule of realized and unrealized gains (losses) on securities

						Quarter ended September 30,												Nine Months ended September 30,
($ in thousands)						2023						2022						2023						2022
Gross gains on sales						$	367					7,094						$	5,307					23,843
Gross losses on sales						(5,264)						(19,668)						(30,146)						(52,573)
Net realized gains (losses) on disposals						(4,897)						(12,574)						(24,839)						(28,730)
Net unrealized gains (losses) on equity securities						489						(7,777)						8,662						(31,791)
Net credit loss benefit (expense) on fixed income securities, AFS						(2,468)						(4,471)						7,925						(42,042)
Net credit loss benefit (expense) on fixed income securities, HTM						—						54						—						62
Net credit loss (expense) on CMLs						(4)						—						(65)						—
Losses on securities for which we have the intent to sell						—						(913)						(645)						(6,412)
Net realized and unrealized investment gains (losses)						$	(6,880)					(25,681)						$	(8,962)					(108,913)

Unrealized Gain (Loss) on Equity Securities

						Quarter ended September 30,												Nine Months ended September 30,
($ in thousands)						2023						2022						2023						2022
Unrealized gains (losses) recognized in income on equity securities:
On securities remaining in our portfolio at end of period						$	200					(5,832)						$	2,744					(16,334)
On securities sold in period						289						(1,945)						5,918						(15,457)
Total unrealized gains (losses) recognized in income on equity securities						$	489					(7,777)						$	8,662					(31,791)

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