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Investments (Tables) | 6 Months Ended
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Jun. 30, 2023
Schedule of Investments [Line Items] |
Schedule of Available-for-sale Securities |
June 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 |  | $ | 313,965 |  |  | — |  |  | — |  |  | (20,943) |  |  | 293,022 |
Foreign government |  | 11,171 |  |  | (34) |  |  | — |  |  | (1,318) |  |  | 9,819 |
Obligations of states and political subdivisions |  | 694,734 |  |  | (769) |  |  | 1,607 |  |  | (37,544) |  |  | 658,028 |
Corporate securities |  | 2,585,819 |  |  | (16,149) |  |  | 4,964 |  |  | (189,664) |  |  | 2,384,970 |
Collateralized loan obligations ("CLO") and other asset-backed securities ("ABS") |  | 1,739,788 |  |  | (2,915) |  |  | 3,353 |  |  | (105,957) |  |  | 1,634,269 |
Residential mortgage-backed securities ("RMBS") |  | 1,520,170 |  |  | (11,550) |  |  | 1,024 |  |  | (101,809) |  |  | 1,407,835 |
Commercial mortgage-backed securities ("CMBS") |  | 699,295 |  |  | (8) |  |  | 162 |  |  | (55,044) |  |  | 644,405 |
Total AFS fixed income securities |  | $ | 7,564,942 |  |  | (31,425) |  |  | 11,110 |  |  | (512,279) |  |  | 7,032,348 |
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 June 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 |  | $ | 36 |  |  | — |  |  | — |  |  | (2) |  |  | — |  |  | — |  |  | 34 |
Obligations of states and political subdivisions |  | 737 |  |  | 67 |  |  | — |  |  | (35) |  |  | — |  |  | — |  |  | 769 |
Corporate securities |  | 16,756 |  |  | 1,438 |  |  | — |  |  | (1,070) |  |  | (939) |  |  | (36) |  |  | 16,149 |
CLO and other ABS |  | 3,895 |  |  | 622 |  |  | — |  |  | (1,595) |  |  | (7) |  |  | — |  |  | 2,915 |
RMBS |  | 11,740 |  |  | 1 |  |  | — |  |  | (50) |  |  | (141) |  |  | — |  |  | 11,550 |
CMBS |  | 390 |  |  | — |  |  | — |  |  | (240) |  |  | (142) |  |  | — |  |  | 8 |
Total AFS fixed income securities |  | $ | 33,554 |  |  | 2,128 |  |  | — |  |  | (2,992) |  |  | (1,229) |  |  | (36) |  |  | 31,425 |
Quarter ended June 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 |  | $ | 150 |  |  | 117 |  |  | — |  |  | 12 |  |  | (14) |  |  | — |  |  | 265 |
Obligations of states and political subdivisions |  | 1,991 |  |  | 534 |  |  | — |  |  | (1,166) |  |  | (153) |  |  | — |  |  | 1,206 |
Corporate securities |  | 23,066 |  |  | 8,323 |  |  | — |  |  | 5,732 |  |  | (1,944) |  |  | (105) |  |  | 35,072 |
CLO and other ABS |  | 2,283 |  |  | 530 |  |  | — |  |  | 819 |  |  | (9) |  |  | — |  |  | 3,623 |
RMBS |  | 10,029 |  |  | 173 |  |  | — |  |  | 507 |  |  | (93) |  |  | — |  |  | 10,616 |
CMBS |  | 80 |  |  | — |  |  | — |  |  | (62) |  |  | — |  |  | — |  |  | 18 |
Total AFS fixed income securities |  | $ | 37,599 |  |  | 9,677 |  |  | — |  |  | 5,842 |  |  | (2,213) |  |  | (105) |  |  | 50,800 |
Six Months ended June 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 |  |  | — |  |  | — |  |  | (250) |  |  | — |  |  | — |  |  | 34 |
Obligations of states and political subdivisions |  | 1,024 |  |  | 67 |  |  | — |  |  | (239) |  |  | (83) |  |  | — |  |  | 769 |
Corporate securities |  | 30,330 |  |  | 4,141 |  |  | — |  |  | (14,884) |  |  | (3,387) |  |  | (51) |  |  | 16,149 |
CLO and other ABS |  | 2,375 |  |  | 677 |  |  | — |  |  | (127) |  |  | (10) |  |  | — |  |  | 2,915 |
RMBS |  | 11,597 |  |  | 8 |  |  | — |  |  | 174 |  |  | (229) |  |  | — |  |  | 11,550 |
CMBS |  | 111 |  |  | 1 |  |  | — |  |  | 39 |  |  | (143) |  |  | — |  |  | 8 |
Total AFS fixed income securities |  | $ | 45,721 |  |  | 4,894 |  |  | — |  |  | (15,287) |  |  | (3,852) |  |  | (51) |  |  | 31,425 |
Six Months ended June 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 |  |  | 236 |  |  | — |  |  | (3) |  |  | (14) |  |  | — |  |  | 265 |
Obligations of states and political subdivisions |  | 137 |  |  | 1,237 |  |  | — |  |  | (4) |  |  | (164) |  |  | — |  |  | 1,206 |
Corporate securities |  | 6,682 |  |  | 28,243 |  |  | — |  |  | 4,542 |  |  | (3,191) |  |  | (1,204) |  |  | 35,072 |
CLO and other ABS |  | 939 |  |  | 2,058 |  |  | — |  |  | 637 |  |  | (11) |  |  | — |  |  | 3,623 |
RMBS |  | 1,909 |  |  | 174 |  |  | 8,318 |  |  | 443 |  |  | (228) |  |  | — |  |  | 10,616 |
CMBS |  | 11 |  |  | 17 |  |  | — |  |  | (10) |  |  | — |  |  | — |  |  | 18 |
Total AFS fixed income securities |  | $ | 9,724 |  |  | 31,965 |  |  | 8,318 |  |  | 5,605 |  |  | (3,608) |  |  | (1,204) |  |  | 50,800 |
Schedule of Fair Value and Gross Pre-Tax Net Unrealized Loss of Securities by Length of Time, AFS |
June 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 |  | $ | 208,153 |  |  | (2,831) |  |  | 84,869 |  |  | (18,112) |  |  | 293,022 |  |  | (20,943) |
Foreign government |  | 4,380 |  |  | (247) |  |  | 5,439 |  |  | (1,071) |  |  | 9,819 |  |  | (1,318) |
Obligations of states and political subdivisions |  | 337,606 |  |  | (5,554) |  |  | 229,922 |  |  | (31,990) |  |  | 567,528 |  |  | (37,544) |
Corporate securities |  | 1,101,756 |  |  | (40,711) |  |  | 895,497 |  |  | (148,953) |  |  | 1,997,253 |  |  | (189,664) |
CLO and other ABS |  | 523,727 |  |  | (17,268) |  |  | 924,490 |  |  | (88,689) |  |  | 1,448,217 |  |  | (105,957) |
RMBS |  | 792,885 |  |  | (26,269) |  |  | 538,073 |  |  | (75,540) |  |  | 1,330,958 |  |  | (101,809) |
CMBS |  | 291,078 |  |  | (12,882) |  |  | 344,647 |  |  | (42,162) |  |  | 635,725 |  |  | (55,044) |
Total AFS fixed income securities |  | $ | 3,259,585 |  |  | (105,762) |  |  | 3,022,937 |  |  | (406,517) |  |  | 6,282,522 |  |  | (512,279) |
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 |  | $ | 369,240 |  |  | 443 |  |  | 442 |
Due after one year through five years |  | 3,056,529 |  |  | 13,942 |  |  | 13,233 |
Due after five years through 10 years |  | 2,912,169 |  |  | 9,291 |  |  | 8,681 |
Due after 10 years |  | 694,410 |  |  | — |  |  | — |
Total fixed income securities |  | $ | 7,032,348 |  |  | 23,676 |  |  | 22,356 |
Schedule of Other Investment Portfolio By Strategy And Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy |
|  | June 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 |  | $ | 298,219 |  |  | 124,213 |  |  | 422,432 |  |  | 280,980 |  |  | 134,676 |  |  | 415,656 |
Private credit |  | 52,379 |  |  | 138,691 |  |  | 191,070 |  |  | 54,866 |  |  | 89,481 |  |  | 144,347 |
Real assets |  | 38,575 |  |  | 19,553 |  |  | 58,128 |  |  | 35,470 |  |  | 21,945 |  |  | 57,415 |
Total alternative investments |  | $ | 389,173 |  |  | 282,457 |  |  | 671,630 |  |  | 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 June 30, |  | Six Months ended June 30,
($ in millions) |  | 2023 |  | 2022 |  | 2023 |  | 2022
Net investment income (loss) |  | $ | (70.6) |  |  | 270.9 |  |  | $ | (141.3) |  |  | 406.5 |
Realized gains |  | 922.0 |  |  | 6,233.5 |  |  | 2,644.3 |  |  | 8,981.5 |
Net change in unrealized appreciation (depreciation) |  | 3,754.0 |  |  | (3,962.4) |  |  | 5,197.8 |  |  | 1,215.9 |
Net income |  | $ | 4,605.4 |  |  | 2,542.0 |  |  | $ | 7,700.8 |  |  | 10,603.9 |
Alternative investment income included in "Net investment income earned" on our Consolidated Statements of Income |  | $ | 11.4 |  |  | 9.3 |  |  | $ | 19.2 |  |  | 28.4 |
Schedule of Securities Pledged As Collateral |
($ in millions) |  | FHLBI Collateral |  | FHLBNY Collateral |  |  |  | State and Regulatory Deposits |  | Total
U.S. government and government agencies |  | $ | — |  |  | — |  |  |  |  | 19.4 |  |  | 19.4 |
Obligations of states and political subdivisions |  | — |  |  | — |  |  |  |  | 3.5 |  |  | 3.5 |
RMBS |  | 62.1 |  |  | 26.9 |  |  |  |  | — |  |  | 89.0 |
CMBS |  | 2.9 |  |  | 8.7 |  |  |  |  | — |  |  | 11.6 |
Total pledged as collateral |  | $ | 65.0 |  |  | 35.6 |  |  |  |  | 22.9 |  |  | 123.5 |
Schedule of Pre-Tax Net Investment Income Earned |
|  | Quarter ended June 30, |  | Six Months ended June 30,
($ in thousands) |  | 2023 |  | 2022 |  | 2023 |  | 2022
Fixed income securities |  | $ | 83,916 |  |  | 62,144 |  |  | $ | 164,003 |  |  | 116,069 |
Commercial mortgage loans ("CMLs") |  | 2,199 |  |  | 1,192 |  |  | 4,164 |  |  | 2,162 |
Equity securities |  | 2,236 |  |  | 2,639 |  |  | 3,441 |  |  | 5,057 |
Short-term investments |  | 2,892 |  |  | 407 |  |  | 7,542 |  |  | 508 |
Alternative investments |  | 11,396 |  |  | 9,274 |  |  | 19,164 |  |  | 28,402 |
Other investments |  | 188 |  |  | (214) |  |  | 231 |  |  | (37) |
Investment expenses |  | (5,131) |  |  | (5,220) |  |  | (9,343) |  |  | (9,337) |
Net investment income earned |  | $ | 97,696 |  |  | 70,222 |  |  | $ | 189,202 |  |  | 142,824 |
Schedule of realized and unrealized gains (losses) on securities |
|  | Quarter ended June 30, |  | Six Months ended June 30,
($ in thousands) |  | 2023 |  | 2022 |  | 2023 |  | 2022
Gross gains on sales |  | $ | 1,156 |  |  | 14,552 |  |  | $ | 4,940 |  |  | 16,749 |
Gross losses on sales |  | (11,952) |  |  | (19,345) |  |  | (24,882) |  |  | (32,905) |
Net realized gains (losses) on disposals |  | (10,796) |  |  | (4,793) |  |  | (19,942) |  |  | (16,156) |
Net unrealized gains (losses) on equity securities |  | 4,925 |  |  | (21,860) |  |  | 8,173 |  |  | (24,014) |
Net credit loss benefit (expense) on fixed income securities, AFS |  | 864 |  |  | (15,519) |  |  | 10,393 |  |  | (37,571) |
Net credit loss benefit (expense) on fixed income securities, HTM |  | — |  |  | (6) |  |  | — |  |  | 8 |
Net credit loss (expense) on CMLs |  | (78) |  |  | — |  |  | (61) |  |  | — |
Losses on securities for which we have the intent to sell |  | (341) |  |  | (702) |  |  | (645) |  |  | (5,499) |
Net realized and unrealized investment gains (losses) |  | $ | (5,426) |  |  | (42,880) |  |  | $ | (2,082) |  |  | (83,232) |
Unrealized Gain (Loss) on Equity Securities |
|  | Quarter ended June 30, |  | Six Months ended June 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 |  | $ | 2,784 |  |  | (13,031) |  |  | $ | 2,685 |  |  | (14,843) |
On securities sold in period |  | 2,141 |  |  | (8,829) |  |  | 5,488 |  |  | (9,171) |
Total unrealized gains (losses) recognized in income on equity securities |  | $ | 4,925 |  |  | (21,860) |  |  | $ | 8,173 |  |  | (24,014) |

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- Definition Tabular disclosure of financial instruments held by the entity for its own account for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions. Description may include equity, fixed income, debt or other securities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -URI https://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27290-111563 + Details
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