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Investments (Tables)
 12 Months Ended
Dec. 31, 2023
Investment [Line Items]  
Schedule of Unrealized Gains (Losses) On Investments
($ in thousands)202320222021
AFS securities:   
Fixed income securities$(353,288)(527,926)228,947 
Total AFS securities(353,288)(527,926)228,947 
Held-to-Maturity ("HTM") securities:
   
Fixed income securities— — (4)
Total HTM securities— — (4)
Short-term securities35 35 20 
Total net unrealized gains (losses)
(353,253)(527,891)228,963 
Deferred income tax 74,184 110,857 (48,082)
Net unrealized gains (losses), net of deferred income tax
(279,069)(417,034)180,881 
Increase (decrease) in net unrealized gains (losses) in OCI, net of deferred income tax
$137,965 (597,915)(124,370)
Schedule of Available For Sale Securities
December 31, 2023    
Cost/   
 AmortizedAllowance forUnrealizedUnrealizedFair
($ in thousands)CostCredit LossesGainsLossesValue
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 

December 31, 2022    
Cost/   
 AmortizedAllowance forUnrealizedUnrealizedFair
($ in thousands)CostCredit LossesGainsLossesValue
AFS fixed income securities:
U.S. government and government agencies$209,528 — 37 (20,326)189,239 
Foreign government11,199 (284)— (1,307)9,608 
Obligations of states and political subdivisions965,231 (1,024)1,812 (48,001)918,018 
Corporate securities2,558,655 (30,330)3,509 (196,809)2,335,025 
CLO and other ABS1,607,660 (2,375)2,408 (121,720)1,485,973 
RMBS1,169,546 (11,597)1,148 (99,265)1,059,832 
CMBS663,935 (111)348 (49,760)614,412 
Total AFS fixed income securities$7,185,754 $(45,721)9,262 (537,188)6,612,107 
Schedule of debt securities, available-for-sale, allowance for credit losses
2023Beginning BalanceCurrent Provision for Securities without Prior AllowanceInitial
Allowance for
Purchased
Credit
Deteriorated
Assets with
Credit
Deterioration		Increase (Decrease) on Securities with Prior Allowance, excluding intent (or Requirements) to Sell SecuritiesReductions for Securities SoldReductions for Securities Identified as Intent (or Requirement) to Sell during the PeriodEnding Balance
($ in thousands)
Foreign government$284 — — (249)— — 35 
Obligations of states and political subdivisons1,024 48 — (281)(122)— 669 
Corporate securities30,330 3,457 — (16,879)(3,638)(271)12,999 
CLO and other ABS2,375 619 — (116)(24)— 2,854 
RMBS11,597 17 — 447 (412)— 11,649 
CMBS111 1 — 38 (144)— 6 
Total AFS fixed income securities$45,721 4,142 — (17,040)(4,340)(271)28,212 

2022Beginning BalanceCurrent Provisions for Securities without Prior AllowanceInitial
Allowance for
Purchased
Credit
Deteriorated
Assets with
Credit
Deterioration		Increase (Decrease) on Securities with Prior Allowance, excluding intent (or Requirements) to Sell SecuritiesReductions for Securities SoldReductions for Securities Identified as Intent (or Requirement) to Sell during the PeriodEnding Balance
($ in thousands)
Foreign government$46 291 — 4 (57)— 284 
Obligations of states and political subdivisons137 1,087 — (6)(194)— 1,024 
Corporate securities6,682 30,670 — 3,714 (6,902)(3,834)30,330 
CLO and other ABS939 2,158 — (652)(50)(20)2,375 
RMBS1,909 245 8,318 1,558 (433)— 11,597 
CMBS11 110 — (10)— — 111 
Total AFS fixed income securities$9,724 34,561 8,318 4,608 (7,636)(3,854)45,721 
Schedule of Fair Value and Gross Pre-Tax Net Unrealized/Unrecognized Loss of Securities by Length of Time
December 31, 2023Less than 12 months12 months or longerTotal
($ in thousands)Fair 
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
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)

December 31, 2022Less than 12 months12 months or longerTotal
($ 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 government5,573 (608)2,456 (699)8,029 (1,307)
Obligations of states and political subdivisions681,795 (43,767)16,618 (4,234)698,413 (48,001)
Corporate securities1,889,492 (164,197)133,223 (32,612)2,022,715 (196,809)
CLO and other ABS916,423 (69,155)411,283 (52,565)1,327,706 (121,720)
RMBS887,229 (76,432)108,041 (22,833)995,270 (99,265)
CMBS512,953 (37,815)77,181 (11,945)590,134 (49,760)
Total AFS fixed income securities$5,060,440 (405,632)764,813 (131,556)5,825,253 (537,188)
Schedule of Investments Classified by Contractual Maturity Date
AFSHTM
($ in thousands)Fair ValueCarrying ValueFair Value
Due in one year or less$511,125 — — 
Due after one year through five years3,450,675 13,624 13,307 
Due after five years through 10 years2,817,046 9,076 8,616 
Due after 10 years720,351 — — 
Total fixed income securities$7,499,197 22,700 21,923 
Schedule of Other Investment Portfolio by Strategy and the Remaining Commitment Amount Associated With Each Strategy
December 31, 2023December 31, 2022
($ in thousands)Carrying
Value		Remaining
Commitment		Maximum
Exposure to Loss		Carrying
Value		Remaining
Commitment		Maximum
Exposure to Loss
Alternative investments   
Private equity$301,759 131,885 433,644 280,980 134,676 415,656 
Private credit54,500 89,401 143,901 54,866 89,481 144,347 
Real assets39,520 33,040 72,560 35,470 21,945 57,415 
Total alternative investments$395,779 254,326 650,105 371,316 246,102 617,418 
Schedule of Aggregated Summarized Balance Sheet Financial Information For Partnerships In Our Alternative Investment Portfolio
Balance Sheet Information
December 31,
($ in millions)20232022
Investments$142,411 114,038 
Total assets146,844 128,158 
Total liabilities15,854 15,464 
Total partners’ capital130,990 112,694 
Schedule of Aggregated Summarized Income Statement Financial Information For Partnerships In Our Alternative Investment Portfolio
Income Statement Information
($ in millions)202320222021
Net investment income (loss)$178 765 653 
Realized gains5,845 12,590 6,121 
Net change in unrealized appreciation (depreciation)
5,810 (5,215)26,877 
Net income$11,833 8,140 33,651 
Alternative investment income included in "Net investment income earned" on our Consolidated Statements of Income26.8 23.0 117.7 
Schedule Of Securities Pledged As Collateral
($ in millions) FHLBI CollateralFHLBNY CollateralRegulatory DepositsTotal
U.S. government and government agencies$— — 19.9 19.9 
Obligations of states and political subdivisions— — 3.5 3.5 
RMBS69.2 25.3 — 94.5 
CMBS2.5 8.6 — 11.1 
Total pledged as collateral$71.7 33.9 23.4 129.0 
Schedule of Components of Pre-Tax Net Investment Income Earned
($ in thousands)202320222021
Fixed income securities$345,886 259,918 209,709 
CMLs9,336 5,555 2,743 
Equity securities9,395 13,554 15,920 
Short-term investments14,818 3,997 260 
Alternative investments26,777 23,003 117,701 
Other investments650 258 359 
Investment expenses(18,212)(18,130)(20,103)
Net investment income earned$388,650 288,155 326,589 
Schedule of realized and unrealized gains (losses) on securities
($ in thousands)202320222021
Gross gains on sales$5,896 28,419 15,284 
Gross losses on sales(30,760)(60,055)(8,140)
Net realized gains (losses) on disposals
(24,864)(31,636)7,144 
Net unrealized gains (losses) on equity securities
9,510 (32,127)17,881 
Net credit loss benefit (expense) on fixed income securities, AFS
12,898 (39,169)(6,858)
Net credit loss benefit (expense) on fixed income securities, HTM
— 63 (49)
Net credit loss benefit (expense) on CMLs
(175)(116)— 
Losses on securities for which we have the intent to sell(921)(11,823)(519)
Net realized and unrealized investment gains (losses)
$(3,552)(114,808)17,599 
Unrealized Gain (Loss) on Equity Securities
($ in thousands)202320222021
Unrealized gains (losses) recognized in income on equity securities:
On securities remaining in our portfolio at end of period$3,593 (10,454)16,473 
On securities sold in period5,917 (21,673)1,408 
Total unrealized gains (losses) recognized in income on equity securities
$9,510 (32,127)17,881