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Investments (Tables) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2020
Schedule of Investments [Line Items] |  |
Schedule of Available-for-sale Securities |  |
September 30, 2020 |  |  |  |  |  |  |  |  |  |
($ in thousands) |  | Cost/ Amortized Cost |  | Allowance for Credit Losses |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
AFS fixed income securities: |  |  |  |  |  |  |  |  |  |
U.S. government and government agencies |  | $ | 110,201 |  |  | — |  |  | 7,374 |  |  | (46) |  |  | 117,529 |
Foreign government |  | 15,679 |  |  | (7) |  |  | 1,336 |  |  | — |  |  | 17,008 |
Obligations of states and political subdivisions |  | 1,152,794 |  |  | (15) |  |  | 78,841 |  |  | (164) |  |  | 1,231,456 |
Corporate securities |  | 2,154,302 |  |  | (5,358) |  |  | 157,689 |  |  | (7,802) |  |  | 2,298,831 |
Collateralized loan obligations ("CLO") and other asset-backed securities ("ABS") |  | 942,627 |  |  | (1,121) |  |  | 18,274 |  |  | (14,198) |  |  | 945,582 |
Residential mortgage-backed securities ("RMBS") |  | 1,122,678 |  |  | (647) |  |  | 61,259 |  |  | (333) |  |  | 1,182,957 |
Commercial mortgage-backed securities ("CMBS") |  | 599,692 |  |  | (32) |  |  | 46,386 |  |  | (1,872) |  |  | 644,174 |
Total AFS fixed income securities |  | $ | 6,097,973 |  |  | (7,180) |  |  | 371,159 |  |  | (24,415) |  |  | 6,437,537 |
December 31, 2019 |  |  |  |  |  |  |  |
($ in thousands) |  | Cost/ Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
AFS fixed income securities: |  |  |  |  |  |  |  |
U.S. government and government agencies |  | $ | 112,680 |  |  | 3,506 |  |  | — |  |  | 116,186 |
Foreign government |  | 18,011 |  |  | 533 |  |  | (2) |  |  | 18,542 |
Obligations of states and political subdivisions |  | 1,168,185 |  |  | 62,175 |  |  | (270) |  |  | 1,230,090 |
Corporate securities |  | 1,866,881 |  |  | 81,906 |  |  | (1,310) |  |  | 1,947,477 |
CLO and other ABS |  | 790,517 |  |  | 7,929 |  |  | (5,434) |  |  | 793,012 |
RMBS |  | 1,409,003 |  |  | 43,421 |  |  | (455) |  |  | 1,451,969 |
CMBS |  | 514,709 |  |  | 23,902 |  |  | (267) |  |  | 538,344 |
Total AFS fixed income securities |  | $ | 5,879,986 |  |  | 223,372 |  |  | (7,738) |  |  | 6,095,620 |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Table Text Block] |  |
Quarter ended September 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |
($ in thousands) |  | Beginning Balance |  | Current Provision for Securities without Prior Allowance |  | 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
Foreign government |  | $ | 28 |  |  | — |  |  | (2) |  |  | (19) |  |  | — |  |  | 7 |
Obligations of states and political subdivisions |  | 17 |  |  | 9 |  |  | (11) |  |  | — |  |  | — |  |  | 15 |
Corporate securities |  | 8,077 |  |  | 1,016 |  |  | (3,455) |  |  | (265) |  |  | (15) |  |  | 5,358 |
CLO and other ABS |  | 1,389 |  |  | — |  |  | (210) |  |  | (51) |  |  | (7) |  |  | 1,121 |
RMBS |  | 831 |  |  | — |  |  | (157) |  |  | (27) |  |  | — |  |  | 647 |
CMBS |  | 53 |  |  | — |  |  | (21) |  |  | — |  |  | — |  |  | 32 |
Total AFS fixed income securities |  | $ | 10,395 |  |  | 1,025 |  |  | (3,856) |  |  | (362) |  |  | (22) |  |  | 7,180 |
Nine Months ended September 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |
($ in thousands) |  | Beginning Balance |  | Current Provision for Securities without Prior Allowance |  | 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
Foreign government |  | $ | — |  |  | 26 |  |  | — |  |  | (19) |  |  | — |  |  | 7 |
Obligations of states and political subdivisions |  | — |  |  | 15 |  |  | — |  |  | — |  |  | — |  |  | 15 |
Corporate securities |  | — |  |  | 6,100 |  |  | — |  |  | (659) |  |  | (83) |  |  | 5,358 |
CLO and other ABS |  | — |  |  | 1,237 |  |  | — |  |  | (109) |  |  | (7) |  |  | 1,121 |
RMBS |  | — |  |  | 690 |  |  | — |  |  | (43) |  |  | — |  |  | 647 |
CMBS |  | — |  |  | 32 |  |  | — |  |  | — |  |  | — |  |  | 32 |
Total AFS fixed income securities |  | $ | — |  |  | 8,100 |  |  | — |  |  | (830) |  |  | (90) |  |  | 7,180 |
Schedule of Fair Value and Gross Pre-Tax Net Unrealized Loss of Securities by Length of Time, AFS |  |
September 30, 2020 |  | 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 |  | $ | 4,855 |  |  | (46) |  |  | — |  |  | — |  |  | 4,855 |  |  | (46) |
Obligations of states and political subdivisions |  | 15,929 |  |  | (164) |  |  | — |  |  | — |  |  | 15,929 |  |  | (164) |
Corporate securities |  | 100,989 |  |  | (7,444) |  |  | 2,695 |  |  | (358) |  |  | 103,684 |  |  | (7,802) |
CLO and other ABS |  | 302,492 |  |  | (7,804) |  |  | 149,893 |  |  | (6,394) |  |  | 452,385 |  |  | (14,198) |
RMBS |  | 55,128 |  |  | (300) |  |  | 2,316 |  |  | (33) |  |  | 57,444 |  |  | (333) |
CMBS |  | 80,308 |  |  | (1,320) |  |  | 14,342 |  |  | (552) |  |  | 94,650 |  |  | (1,872) |
Total AFS fixed income securities |  | $ | 559,701 |  |  | (17,078) |  |  | 169,246 |  |  | (7,337) |  |  | 728,947 |  |  | (24,415) |
December 31, 2019 |  | 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: |  |  |  |  |  |  |  |  |  |  |  |
Foreign government |  | $ | 1,416 |  |  | (2) |  |  | — |  |  | — |  |  | 1,416 |  |  | (2) |
Obligations of states and political subdivisions |  | 35,838 |  |  | (270) |  |  | — |  |  | — |  |  | 35,838 |  |  | (270) |
Corporate securities |  | 84,832 |  |  | (480) |  |  | 20,182 |  |  | (830) |  |  | 105,014 |  |  | (1,310) |
CLO and other ABS |  | 205,191 |  |  | (1,938) |  |  | 204,385 |  |  | (3,496) |  |  | 409,576 |  |  | (5,434) |
RMBS |  | 126,089 |  |  | (425) |  |  | 5,375 |  |  | (30) |  |  | 131,464 |  |  | (455) |
CMBS |  | 62,893 |  |  | (264) |  |  | 828 |  |  | (3) |  |  | 63,721 |  |  | (267) |
Total AFS fixed income securities |  | $ | 516,259 |  |  | (3,379) |  |  | 230,770 |  |  | (4,359) |  |  | 747,029 |  |  | (7,738) |
Schedule of Fixed Maturity Securities By Contractual Maturities |  |
|  | AFS |  | HTM
($ in thousands) |  | Fair Value |  | Carrying Value |  | Fair Value
Due in one year or less |  | $ | 336,142 |  |  | 1,456 |  |  | 1,490 |
Due after one year through five years |  | 3,714,414 |  |  | 15,131 |  |  | 16,293 |
Due after five years through 10 years |  | 1,960,132 |  |  | 2,500 |  |  | 2,430 |
Due after 10 years |  | 426,849 |  |  | — |  |  | — |
Total fixed income securities |  | $ | 6,437,537 |  |  | 19,087 |  |  | 20,213 |
Schedule of Other Investment Portfolio By Strategy And Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy |  |
Other Investments |  | September 30, 2020 |  | December 31, 2019
($ in thousands) |  | Carrying Value |  | Remaining Commitment |  | Maximum Exposure to Loss 1 |  | Carrying Value |  | Remaining Commitment |  | Maximum Exposure to Loss 1
Alternative Investments |  |  |  |  |  |  |  |  |  |  |  |
Private equity |  | $ | 146,810 |  |  | 110,173 |  |  | 256,983 |  |  | 118,352 |  |  | 93,138 |  |  | 211,490 |
Private credit |  | 49,254 |  |  | 96,131 |  |  | 145,385 |  |  | 42,532 |  |  | 105,340 |  |  | 147,872 |
Real assets |  | 21,859 |  |  | 19,070 |  |  | 40,929 |  |  | 23,256 |  |  | 20,741 |  |  | 43,997 |
Total alternative investments |  | 217,923 |  |  | 225,374 |  |  | 443,297 |  |  | 184,140 |  |  | 219,219 |  |  | 403,359 |
Other securities |  | 40,725 |  |  | — |  |  | 40,725 |  |  | 32,667 |  |  | — |  |  | 32,667 |
Total other investments |  | $ | 258,648 |  |  | 225,374 |  |  | 484,022 |  |  | 216,807 |  |  | 219,219 |  |  | 436,026 |
1 The maximum exposure to loss includes both the carry value of these investments and the related remaining commitments. In addition, tax credits that have been previously recognized in Other securities are subject to the risk of recapture, which we do not consider significant.
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) |  | 2020 |  | 2019 |  | 2020 |  | 2019
Net investment (loss) income |  | $ | 83.4 |  |  | (14.0) |  |  | 92.9 |  |  | 10.1 |
Realized (losses) gains |  | 731.3 |  |  | 121.1 |  |  | 1,075.0 |  |  | 370.4 |
Net change in unrealized appreciation (depreciation) |  | 2,230.4 |  |  | 1,739.4 |  |  | 571.6 |  |  | 4,517.4 |
Net income |  | $ | 3,045.1 |  |  | 1,846.5 |  |  | 1,739.5 |  |  | 4,897.9 |
Insurance Subsidiaries’ alternative investments income |  | $ | 18.7 |  |  | 5.2 |  |  | 8.9 |  |  | 13.0 |
Schedule of Securities Pledged As Collateral |  |
($ in millions) |  | FHLBI Collateral |  | FHLBNY Collateral |  |  |  | State and Regulatory Deposits |  | Total
U.S. government and government agencies |  | $ | — |  |  | — |  |  |  |  | 22.7 |  |  | 22.7 |
Obligations of states and political subdivisions |  | — |  |  | — |  |  |  |  | 5.1 |  |  | 5.1 |
RMBS |  | 133.0 |  |  | 205.2 |  |  |  |  | — |  |  | 338.2 |
CMBS |  | 7.2 |  |  | 36.7 |  |  |  |  | — |  |  | 43.9 |
Total pledged as collateral |  | $ | 140.2 |  |  | 241.9 |  |  |  |  | 27.8 |  |  | 409.9 |
Schedule of Pre-Tax Net Investment Income Earned |  |
|  | Quarter ended September 30, |  | Nine Months ended September 30,
($ in thousands) |  | 2020 |  | 2019 |  | 2020 |  | 2019
Fixed income securities |  | $ | 51,285 |  |  | 50,749 |  |  | 152,617 |  |  | 150,689 |
CMLs |  | 245 |  |  | — |  |  | 463 |  |  | — |
Equity securities |  | 1,948 |  |  | 1,885 |  |  | 5,523 |  |  | 5,265 |
Short-term investments |  | 244 |  |  | 1,410 |  |  | 1,830 |  |  | 5,213 |
Other investments |  | 18,671 |  |  | 5,267 |  |  | 9,167 |  |  | 13,421 |
Investment expenses |  | (4,208) |  |  | (3,485) |  |  | (11,004) |  |  | (9,639) |
Net investment income earned |  | $ | 68,185 |  |  | 55,826 |  |  | 158,596 |  |  | 164,949 |
Schedule Of O T T I By Asset Type [Table Text Block] |
|  | Quarter ended September 30,
|  | 2020 |  | 2019
($ in thousands) |  | Credit Loss Benefit (Expense) |  | Other Impairment Expense |  | Recognized in Earnings |  | Recognized in Earnings
HTM fixed income securities: |  |  |  |  |  |  |  |
Corporate securities |  | $ | 3 |  |  | — |  |  | 3 |  |  | — |
Total HTM fixed income securities |  | 3 |  |  | — |  |  | 3 |  |  | — |
AFS fixed income securities: |  |  |  |  |  |  |  |
Foreign government |  | 3 |  |  | — |  |  | 3 |  |  | — |
Obligations of states and political subdivisions |  | 2 |  |  | — |  |  | 2 |  |  | — |
Corporate securities |  | 2,454 |  |  | — |  |  | 2,454 |  |  | (1,681) |
CLO and other ABS |  | 217 |  |  | (44) |  |  | 173 |  |  | — |
RMBS |  | 157 |  |  | — |  |  | 157 |  |  | — |
CMBS |  | 21 |  |  | — |  |  | 21 |  |  | — |
Total AFS fixed income securities |  | 2,854 |  |  | (44) |  |  | 2,810 |  |  | (1,681) |
CMLs |  | (2) |  |  | — |  |  | (2) |  |  | — |
Short term investments |  | (1) |  |  | — |  |  | (1) |  |  | — |
Other investments |  | — |  |  | — |  |  | — |  |  | (610) |
Total OTTI benefit (expense) |  | $ | 2,854 |  |  | (44) |  |  | 2,810 |  |  | (2,291) |
|  | Nine Months ended September 30,
|  | 2020 |  | 2019
($ in thousands) |  | Credit Loss (Expense) Benefit |  | Other Impairment Expense |  | Recognized in Earnings |  | Recognized in Earnings
HTM fixed income securities: |  |  |  |  |  |  |  |
Corporate securities |  | $ | 4 |  |  | — |  |  | 4 |  |  | — |
Total HTM fixed income securities |  | 4 |  |  | — |  |  | 4 |  |  | — |
AFS fixed income securities: |  |  |  |  |  |  |  |
U.S. government and government agencies |  | — |  |  | (14) |  |  | (14) |  |  | — |
Foreign government |  | (25) |  |  | — |  |  | (25) |  |  | — |
Obligations of states and political subdivisions |  | (15) |  |  | (62) |  |  | (77) |  |  | (65) |
Corporate securities |  | (6,018) |  |  | (12,103) |  |  | (18,121) |  |  | (2,455) |
CLO and other ABS |  | (1,230) |  |  | (2,137) |  |  | (3,367) |  |  | — |
RMBS |  | (690) |  |  | (91) |  |  | (781) |  |  | — |
CMBS |  | (32) |  |  | (1,852) |  |  | (1,884) |  |  | — |
Total AFS fixed income securities |  | (8,010) |  |  | (16,259) |  |  | (24,269) |  |  | (2,520) |
CMLs |  | (220) |  |  | — |  |  | (220) |  |  | — |
Short-term investments |  | (1) |  |  | — |  |  | (1) |  |  | — |
Other investments |  | — |  |  | — |  |  | — |  |  | (846) |
Total OTTI expense |  | $ | (8,227) |  |  | (16,259) |  |  | (24,486) |  |  | (3,366) |
Schedule of Components of Net Realized and Unrealized Gains and Losses Excluding OTTI Charges |  |
|  | Quarter ended September 30, |  | Nine Months ended September 30,
($ in thousands) |  | 2020 |  | 2019 |  | 2020 |  | 2019
Net realized gains (losses) on the disposals of securities: |  |  |  |  |  |  |  |
Fixed income securities |  | $ | 561 |  |  | (1,141) |  |  | 7,137 |  |  | 2,063 |
CMLs |  | 1 |  |  | — |  |  | 2 |  |  | — |
Equity securities |  | — |  |  | 21,602 |  |  | (3) |  |  | 24,733 |
Short-term investments |  | 11 |  |  | (36) |  |  | 157 |  |  | (21) |
Other investments |  | — |  |  | — |  |  | (5) |  |  | (23) |
Net realized gains (losses) on the disposal of securities |  | 573 |  |  | 20,425 |  |  | 7,288 |  |  | 26,752 |
OTTI benefit (expense) |  | 2,810 |  |  | (2,291) |  |  | (24,486) |  |  | (3,366) |
Net realized gains (losses) |  | 3,383 |  |  | 18,134 |  |  | (17,198) |  |  | 23,386 |
Unrealized gains (losses) recognized in income on equity securities |  | 4,338 |  |  | (20,317) |  |  | (7,098) |  |  | (8,091) |
Total net realized and unrealized investment gains (losses) |  | $ | 7,721 |  |  | (2,183) |  |  | $ | (24,296) |  |  | 15,295 |
Schedule of Realized Gains and Losses on Disposals of Securities |  |
|  | Quarter ended September 30, |  | Nine Months ended September 30,
($ in thousands) |  | 2020 |  | 2019 |  | 2020 |  | 2019
HTM fixed income securities |  |  |  |  |  |  |  |
Gains |  | $ | 1 |  |  | — |  |  | 2 |  |  | 1 |
Losses |  | — |  |  | — |  |  | — |  |  | (15) |
AFS fixed income securities |  |  |  |  |  |  |  |
Gains |  | 2,955 |  |  | 1,078 |  |  | 14,770 |  |  | 5,565 |
Losses |  | (2,395) |  |  | (2,219) |  |  | (7,635) |  |  | (3,488) |
CMLs |  |  |  |  |  |  |  |
Gains |  | 1 |  |  | — |  |  | 2 |  |  | — |
Losses |  | — |  |  | — |  |  | — |  |  | — |
Equity securities |  |  |  |  |  |  |  |
Gains |  | — |  |  | 21,630 |  |  | — |  |  | 24,868 |
Losses |  | — |  |  | (28) |  |  | (3) |  |  | (135) |
Short-term investments |  |  |  |  |  |  |  |
Gains |  | 18 |  |  | 2 |  |  | 355 |  |  | 18 |
Losses |  | (7) |  |  | (38) |  |  | (198) |  |  | (39) |
Other investments |  |  |  |  |  |  |  |
Gains |  | — |  |  | — |  |  | — |  |  | 7 |
Losses |  | — |  |  | — |  |  | (5) |  |  | (30) |
Total net realized gains on disposals of securities |  | $ | 573 |  |  | 20,425 |  |  | 7,288 |  |  | 26,752 |
Equity Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Schedule of Components of Net Realized and Unrealized Gains and Losses Excluding OTTI Charges |  |
|  | Quarter ended September 30, |  | Nine Months ended September 30,
($ in thousands) |  | 2020 |  | 2019 |  | 2020 |  | 2019
Unrealized gains (losses) recognized in income on equity securities: |  |  |  |  |  |  |  |
On securities remaining in our portfolio at September 30, 2020 |  | $ | 4,338 |  |  | 1,109 |  |  | (7,101) |  |  | 1,805 |
On securities sold in each respective period |  | — |  |  | (21,426) |  |  | 3 |  |  | (9,896) |
Total unrealized gains (losses) recognized in income on equity securities |  | $ | 4,338 |  |  | (20,317) |  |  | (7,098) |  |  | (8,091) |

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