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Investments (Tables) | 12 Months Ended
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Dec. 31, 2023
Investment [Line Items] |
Schedule of Unrealized Gains (Losses) On Investments |
($ in thousands) |  | 2023 |  | 2022 |  | 2021
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 securities |  | 35 |  |  | 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/ |  |  |  |  |  |  |  |
|  | Amortized |  | Allowance for |  | Unrealized |  | Unrealized |  | Fair
($ in thousands) |  | Cost |  | Credit Losses |  | Gains |  | Losses |  | Value
AFS fixed income securities: |  |  |  |  |  |  |  |  |  |
U.S. government and government agencies |  | $ | 223,157 |  |  | — |  |  | 139 |  |  | (18,261) |  |  | 205,035 |
Foreign government |  | 11,140 |  |  | (35) |  |  | — |  |  | (1,302) |  |  | 9,803 |
Obligations of states and political subdivisions |  | 612,938 |  |  | (669) |  |  | 2,623 |  |  | (28,927) |  |  | 585,965 |
Corporate securities |  | 2,834,048 |  |  | (12,999) |  |  | 28,078 |  |  | (137,888) |  |  | 2,711,239 |
CLO and other ABS |  | 1,911,831 |  |  | (2,854) |  |  | 11,855 |  |  | (86,005) |  |  | 1,834,827 |
RMBS |  | 1,568,960 |  |  | (11,649) |  |  | 6,023 |  |  | (85,851) |  |  | 1,477,483 |
CMBS |  | 718,623 |  |  | (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/ |  |  |  |  |  |  |  |
|  | Amortized |  | Allowance for |  | Unrealized |  | Unrealized |  | Fair
($ in thousands) |  | Cost |  | Credit Losses |  | Gains |  | Losses |  | Value
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 |
Schedule of debt securities, available-for-sale, allowance for credit losses |
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 Requirements) 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 |  |  | — |  |  | — |  |  | (249) |  |  | — |  |  | — |  |  | 35 |
Obligations of states and political subdivisons | 1,024 |  |  | 48 |  |  | — |  |  | (281) |  |  | (122) |  |  | — |  |  | 669 |
Corporate securities | 30,330 |  |  | 3,457 |  |  | — |  |  | (16,879) |  |  | (3,638) |  |  | (271) |  |  | 12,999 |
CLO and other ABS | 2,375 |  |  | 619 |  |  | — |  |  | (116) |  |  | (24) |  |  | — |  |  | 2,854 |
RMBS | 11,597 |  |  | 17 |  |  | — |  |  | 447 |  |  | (412) |  |  | — |  |  | 11,649 |
CMBS | 111 |  |  | 1 |  |  | — |  |  | 38 |  |  | (144) |  |  | — |  |  | 6 |
Total AFS fixed income securities | $ | 45,721 |  |  | 4,142 |  |  | — |  |  | (17,040) |  |  | (4,340) |  |  | (271) |  |  | 28,212 |
2022 | Beginning Balance |  | Current Provisions 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 Requirements) 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 |  |  | 291 |  |  | — |  |  | 4 |  |  | (57) |  |  | — |  |  | 284 |
Obligations of states and political subdivisons | 137 |  |  | 1,087 |  |  | — |  |  | (6) |  |  | (194) |  |  | — |  |  | 1,024 |
Corporate securities | 6,682 |  |  | 30,670 |  |  | — |  |  | 3,714 |  |  | (6,902) |  |  | (3,834) |  |  | 30,330 |
CLO and other ABS | 939 |  |  | 2,158 |  |  | — |  |  | (652) |  |  | (50) |  |  | (20) |  |  | 2,375 |
RMBS | 1,909 |  |  | 245 |  |  | 8,318 |  |  | 1,558 |  |  | (433) |  |  | — |  |  | 11,597 |
CMBS | 11 |  |  | 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, 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 |  | $ | 77,698 |  |  | (188) |  |  | 108,578 |  |  | (18,073) |  |  | 186,276 |  |  | (18,261) |
Foreign government |  | 1,552 |  |  | (87) |  |  | 8,251 |  |  | (1,215) |  |  | 9,803 |  |  | (1,302) |
Obligations of states and political subdivisions |  | 137,031 |  |  | (962) |  |  | 290,964 |  |  | (27,965) |  |  | 427,995 |  |  | (28,927) |
Corporate securities |  | 263,423 |  |  | (6,369) |  |  | 1,439,422 |  |  | (131,519) |  |  | 1,702,845 |  |  | (137,888) |
CLO and other ABS |  | 278,940 |  |  | (7,120) |  |  | 984,175 |  |  | (78,885) |  |  | 1,263,115 |  |  | (86,005) |
RMBS |  | 351,976 |  |  | (4,765) |  |  | 757,914 |  |  | (81,086) |  |  | 1,109,890 |  |  | (85,851) |
CMBS |  | 130,189 |  |  | (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, 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 Investments Classified by Contractual Maturity Date |
|  | AFS |  | HTM
($ in thousands) |  | Fair Value |  | Carrying Value |  | Fair Value
Due in one year or less |  | $ | 511,125 |  |  | — |  |  | — |
Due after one year through five years |  | 3,450,675 |  |  | 13,624 |  |  | 13,307 |
Due after five years through 10 years |  | 2,817,046 |  |  | 9,076 |  |  | 8,616 |
Due after 10 years |  | 720,351 |  |  | — |  |  | — |
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, 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 |  | $ | 301,759 |  |  | 131,885 |  |  | 433,644 |  |  | 280,980 |  |  | 134,676 |  |  | 415,656 |
Private credit |  | 54,500 |  |  | 89,401 |  |  | 143,901 |  |  | 54,866 |  |  | 89,481 |  |  | 144,347 |
Real assets |  | 39,520 |  |  | 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) |  | 2023 |  | 2022
Investments |  | $ | 142,411 |  |  | 114,038 |
Total assets |  | 146,844 |  |  | 128,158 |
Total liabilities |  | 15,854 |  |  | 15,464 |
Total partners’ capital |  | 130,990 |  |  | 112,694 |
Schedule of Aggregated Summarized Income Statement Financial Information For Partnerships In Our Alternative Investment Portfolio |
Income Statement Information |  |  |  |  |  |
($ in millions) |  | 2023 |  | 2022 |  | 2021
Net investment income (loss) |  | $ | 178 |  |  | 765 |  |  | 653 |
Realized gains |  | 5,845 |  |  | 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 Income |  | 26.8 |  |  | 23.0 |  |  | 117.7 |
Schedule Of Securities Pledged As Collateral |
($ in millions) |  | FHLBI Collateral |  | FHLBNY Collateral |  | Regulatory Deposits |  | Total
U.S. government and government agencies |  | $ | — |  |  | — |  |  | 19.9 |  |  | 19.9 |
Obligations of states and political subdivisions |  | — |  |  | — |  |  | 3.5 |  |  | 3.5 |
RMBS |  | 69.2 |  |  | 25.3 |  |  | — |  |  | 94.5 |
CMBS |  | 2.5 |  |  | 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) |  | 2023 |  | 2022 |  | 2021
Fixed income securities |  | $ | 345,886 |  |  | 259,918 |  |  | 209,709 |
CMLs |  | 9,336 |  |  | 5,555 |  |  | 2,743 |
Equity securities |  | 9,395 |  |  | 13,554 |  |  | 15,920 |
Short-term investments |  | 14,818 |  |  | 3,997 |  |  | 260 |
Alternative investments |  | 26,777 |  |  | 23,003 |  |  | 117,701 |
Other investments |  | 650 |  |  | 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) |  | 2023 |  | 2022 |  | 2021
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) |  | 2023 |  | 2022 |  | 2021
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 period |  | 5,917 |  |  | (21,673) |  |  | 1,408 |
Total unrealized gains (losses) recognized in income on equity securities |  | $ | 9,510 |  |  | (32,127) |  |  | 17,881 |

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