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Investments (Tables) | 12 Months Ended
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Dec. 31, 2019
Investment [Line Items] |
Schedule of Unrealized Gains (Losses) On Investments |
($ in thousands) |  | 2019 |  | 2018 |  | 2017
AFS securities: |  |  |  |  |  |  |  |  |
Fixed income securities |  | $ | 215,634 |  |  | 2,302 |  |  | 85,806 |
Equity securities |  | — |  |  | — |  |  | 38,894 |
Total AFS securities |  | 215,634 |  |  | 2,302 |  |  | 124,700 |
HTM securities: |  |  |  |  |  |  |  |  |
Fixed income securities |  | 31 |  |  | 89 |  |  | (21 | )
Total HTM securities |  | 31 |  |  | 89 |  |  | (21 | )
Short-term securities |  | 23 |  |  | — |  |  | — |
Total net unrealized gains |  | 215,688 |  |  | 2,391 |  |  | 124,679 |
Deferred income tax |  | (45,294 | ) |  | (502 | ) |  | (44,103 | )
Net unrealized gains, net of deferred income tax |  | 170,394 |  |  | 1,889 |  |  | 80,576 |
Cumulative effect adjustment due to accounting change for equity unrealized 1 |  | — |  |  | 30,726 |  |  | — |
Cumulative effect adjustment due to accounting changes due to accounting change for stranded tax assets 1 |  | — |  |  | (17,920 | ) |  | — |
Increase (decrease) in net unrealized gains in OCI, net of deferred income tax |  | $ | 168,505 |  |  | (65,881 | ) |  | 38,453 |
Schedule of Held-to-maturity Securities |
December 31, 2019 |  |  |  | Net |  |  |  |  |  |  |  |
|  |  |  | Unrealized |  |  |  | Unrecognized |  | Unrecognized |  |
|  | Amortized |  | Gains |  | Carrying |  | Holding |  | Holding |  | Fair
($ in thousands) |  | Cost |  | (Losses) |  | Value |  | Gains |  | Losses |  | Value
Obligations of state and political subdivisions |  | $ | 4,573 |  |  | 7 |  |  | 4,580 |  |  | 342 |  |  | (1 | ) |  | 4,921 |
Corporate securities |  | 16,196 |  |  | 24 |  |  | 16,220 |  |  | 834 |  |  | — |  |  | 17,054 |
Total HTM fixed income securities |  | $ | 20,769 |  |  | 31 |  |  | 20,800 |  |  | 1,176 |  |  | (1 | ) |  | 21,975 |
December 31, 2018 |  |  |  | Net |  |  |  |  |  |  |  |
|  |  |  | Unrealized |  |  |  | Unrecognized |  | Unrecognized |  |
|  | Amortized |  | Gains |  | Carrying |  | Holding |  | Holding |  | Fair
($ in thousands) |  | Cost |  | (Losses) |  | Value |  | Gains |  | Losses |  | Value
Obligations of state and political subdivisions |  | 17,431 |  |  | 39 |  |  | 17,470 |  |  | 504 |  |  | (5 | ) |  | 17,969 |
Corporate securities |  | 19,590 |  |  | 50 |  |  | 19,640 |  |  | 855 |  |  | (147 | ) |  | 20,348 |
Total HTM fixed income securities |  | $ | 37,021 |  |  | 89 |  |  | 37,110 |  |  | 1,359 |  |  | (152 | ) |  | 38,317 |
Schedule of Available For Sale Securities |
December 31, 2019 |  |  |  |  |  |  |  |
|  | Cost/ |  |  |  |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair
($ in thousands) |  | Cost |  | Gains |  | Losses |  | 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 |
CMBS |  | 514,709 |  |  | 23,902 |  |  | (267 | ) |  | 538,344 |
RMBS |  | 1,409,003 |  |  | 43,421 |  |  | (455 | ) |  | 1,451,969 |
Total AFS fixed income securities |  | $ | 5,879,986 |  |  | 223,372 |  |  | (7,738 | ) |  | 6,095,620 |
December 31, 2018 |  |  |  |  |  |  |  |
|  | Cost/ |  |  |  |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair
($ in thousands) |  | Cost |  | Gains |  | Losses |  | Value
AFS fixed income securities: |  |  |  |  |  |  |  |
U.S. government and government agencies |  | $ | 120,092 |  |  | 1,810 |  |  | (592 | ) |  | 121,310 |
Foreign government |  | 23,202 |  |  | 36 |  |  | (107 | ) |  | 23,131 |
Obligations of states and political subdivisions |  | 1,121,615 |  |  | 19,485 |  |  | (2,631 | ) |  | 1,138,469 |
Corporate securities |  | 1,639,852 |  |  | 5,521 |  |  | (27,965 | ) |  | 1,617,408 |
CLO and other ABS |  | 720,193 |  |  | 4,112 |  |  | (6,943 | ) |  | 717,362 |
CMBS |  | 527,409 |  |  | 3,417 |  |  | (3,748 | ) |  | 527,078 |
RMBS |  | 1,118,435 |  |  | 12,988 |  |  | (3,081 | ) |  | 1,128,342 |
Total AFS fixed income securities |  | $ | 5,270,798 |  |  | 47,369 |  |  | (45,067 | ) |  | 5,273,100 |
Schedule of Fair Value and Gross Pre-Tax Net Unrealized/Unrecognized Loss of Securities by Length of Time |
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 | )
CMBS |  | 62,893 |  |  | (264 | ) |  | 828 |  |  | (3 | ) |  | 63,721 |  |  | (267 | )
RMBS |  | 126,089 |  |  | (425 | ) |  | 5,375 |  |  | (30 | ) |  | 131,464 |  |  | (455 | )
Total AFS fixed income securities |  | $ | 516,259 |  |  | (3,379 | ) |  | 230,770 |  |  | (4,359 | ) |  | 747,029 |  |  | (7,738 | )
December 31, 2018 |  | 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 |  | $ | 6,693 |  |  | (174 | ) |  | 23,163 |  |  | (418 | ) |  | 29,856 |  |  | (592 | )
Foreign government |  | 12,208 |  |  | (93 | ) |  | 1,482 |  |  | (14 | ) |  | 13,690 |  |  | (107 | )
Obligations of states and political subdivisions |  | 196,798 |  |  | (2,074 | ) |  | 42,821 |  |  | (557 | ) |  | 239,619 |  |  | (2,631 | )
Corporate securities |  | 1,041,952 |  |  | (23,649 | ) |  | 78,953 |  |  | (4,316 | ) |  | 1,120,905 |  |  | (27,965 | )
CLO and other ABS |  | 516,106 |  |  | (6,750 | ) |  | 16,800 |  |  | (193 | ) |  | 532,906 |  |  | (6,943 | )
CMBS |  | 229,338 |  |  | (2,548 | ) |  | 66,294 |  |  | (1,200 | ) |  | 295,632 |  |  | (3,748 | )
RMBS |  | 139,338 |  |  | (1,660 | ) |  | 45,661 |  |  | (1,421 | ) |  | 184,999 |  |  | (3,081 | )
Total AFS fixed income securities |  | $ | 2,142,433 |  |  | (36,948 | ) |  | 275,174 |  |  | (8,119 | ) |  | 2,417,607 |  |  | (45,067 | )
Schedule of Investments Classified by Contractual Maturity Date |
|  | AFS |  | HTM
($ in thousands) |  | Fair Value |  | Carrying Value |  | Fair Value
Due in one year or less |  | $ | 394,027 |  |  | 1,211 |  |  | 1,229 |
Due after one year through five years |  | 3,001,602 |  |  | 13,856 |  |  | 14,820 |
Due after five years through 10 years |  | 2,531,172 |  |  | 5,733 |  |  | 5,926 |
Due after 10 years |  | 168,819 |  |  | — |  |  | — |
Total fixed income securities |  | $ | 6,095,620 |  |  | 20,800 |  |  | 21,975 |
Schedule of Other Investment Portfolio by Strategy and the Remaining Commitment Amount Associated With Each Strategy |
Other Investments |  | December 31, 2019 |  | December 31, 2018
($ in thousands) |  | Carrying Value |  | Remaining Commitment |  | Maximum Exposure to Loss 1 |  | Carrying Value |  | Remaining Commitment |  | Maximum Exposure to Loss 1
Alternative Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Private equity |  | $ | 118,352 |  |  | 93,138 |  |  | 211,490 |  |  | 84,352 |  |  | 93,688 |  |  | 178,040 |
Private credit |  | 42,532 |  |  | 105,340 |  |  | 147,872 |  |  | 41,682 |  |  | 81,453 |  |  | 123,135 |
Real assets |  | 23,256 |  |  | 20,741 |  |  | 43,997 |  |  | 27,862 |  |  | 27,129 |  |  | 54,991 |
Total alternative investments |  | 184,140 |  |  | 219,219 |  |  | 403,359 |  |  | 153,896 |  |  | 202,270 |  |  | 356,166 |
Other securities 2 |  | 32,667 |  |  | — |  |  | 32,667 |  |  | 25,042 |  |  | — |  |  | 25,042 |
Total other investments |  | $ | 216,807 |  |  | 219,219 |  |  | 436,026 |  |  | 178,938 |  |  | 202,270 |  |  | 381,208 |
Schedule of Aggregated Summarized Balance Sheet Financial Information For Partnerships In Our Alternative Investment Portfolio |
Balance Sheet Information |  |  |  |
December 31, |  |  |  |
($ in millions) |  | 2019 |  | 2018
Investments |  | $ | 43,857 |  |  | 28,292 |
Total assets |  | 45,432 |  |  | 30,377 |
Total liabilities |  | 5,670 |  |  | 4,532 |
Total partners’ capital |  | 39,762 |  |  | 25,845 |
Schedule of Aggregated Summarized Income Statement Financial Information For Partnerships In Our Alternative Investment Portfolio |
Income Statement Information |  |  |  |  |  |
12 months ended September 30, |  |  |  |  |  |
($ in millions) |  | 2019 |  | 2018 |  | 2017
Net investment (loss) income |  | $ | (8 | ) |  | 134 |  |  | (143 | )
Realized gains |  | 695 |  |  | 1,981 |  |  | 325 |
Net change in unrealized appreciation |  | 5,543 |  |  | 1,303 |  |  | 2,894 |
Net income before tax |  | $ | 6,230 |  |  | 3,418 |  |  | 3,076 |
Insurance Subsidiaries' alternative investments income before tax |  | 17.9 |  |  | 17.6 |  |  | 12.7 |
Schedule Of Securities Pledged As Collateral |
($ in millions) |  | FHLBI Collateral |  | FHLBNY Collateral |  | State and Regulatory Deposits |  | Total
U.S. government and government agencies |  | $ | — |  |  | — |  |  | 22.8 |  |  | 22.8 |
Obligations of states and political subdivisions |  | — |  |  | — |  |  | 4.0 |  |  | 4.0 |
Corporate securities |  | — |  |  | — |  |  | 0.3 |  |  | 0.3 |
CMBS |  | 7.2 |  |  | 17.9 |  |  | — |  |  | 25.1 |
RMBS |  | 59.0 |  |  | 77.6 |  |  | — |  |  | 136.6 |
Total pledged as collateral |  | $ | 66.2 |  |  | 95.5 |  |  | 27.1 |  |  | 188.8 |
Schedule of Components of Pre-Tax Net Investment Income Earned |
($ in thousands) |  | 2019 |  | 2018 |  | 2017
Fixed income securities |  | $ | 203,255 |  |  | 178,104 |  |  | 153,230 |
Equity securities |  | 6,996 |  |  | 7,764 |  |  | 6,442 |
Short-term investments |  | 6,653 |  |  | 3,472 |  |  | 1,526 |
Other investments |  | 18,778 |  |  | 17,799 |  |  | 12,871 |
Investment expenses |  | (13,139 | ) |  | (11,803 | ) |  | (12,187 | )
Net investment income earned |  | $ | 222,543 |  |  | 195,336 |  |  | 161,882 |
Schedule of OTTI by Asset Type |
2019 |  |  |  |  |  | Recognized in Earnings
($ in thousands) |  | Gross |  | Included in OCI |
AFS fixed income securities: |  |  |  |  |  |
Obligations of states and political subdivisions |  | 66 |  |  | — |  |  | 66 |
Corporate securities |  | $ | 2,529 |  |  | — |  |  | 2,529 |
Total AFS fixed income securities |  | 2,595 |  |  | — |  |  | 2,595 |
Other investments |  | 1,049 |  |  | — |  |  | 1,049 |
Total OTTI losses |  | $ | 3,644 |  |  | — |  |  | 3,644 |
2018 |  |  |  |  |  | Recognized in Earnings
($ in thousands) |  | Gross |  | Included in OCI |
AFS fixed income securities: |  |  |  |  |  |
Corporate securities |  | $ | 1,783 |  |  | — |  |  | 1,783 |
RMBS |  | 2,903 |  |  | — |  |  | 2,903 |
Total AFS fixed income securities |  | 4,686 |  |  | — |  |  | 4,686 |
Other investments |  | 1,893 |  |  | — |  |  | 1,893 |
Total OTTI losses |  | $ | 6,579 |  |  | — |  |  | 6,579 |
2017 |  |  |  |  |  | Recognized in Earnings
($ in thousands) |  | Gross |  | Included in OCI |
AFS fixed income securities: |  |  |  |  |  |  |  |  |
U.S. government and government agencies |  | $ | 36 |  |  | — |  |  | 36 |
Obligations of states and political subdivisons |  | 612 |  |  | — |  |  | 612 |
Corporate securities |  | 587 |  |  | — |  |  | 587 |
CLO and other ABS |  | 96 |  |  | — |  |  | 96 |
CMBS |  | 670 |  |  | — |  |  | 670 |
RMBS |  | 1,183 |  |  | (36 | ) |  | 1,219 |
Total AFS fixed income securities |  | 3,184 |  |  | (36 | ) |  | 3,220 |
AFS equity securities: |  |  |  |  |  |
Common stock |  | 1,435 |  |  | — |  |  | 1,435 |
Total AFS equity securities |  | 1,435 |  |  | — |  |  | 1,435 |
Other investments |  | 190 |  |  | — |  |  | 190 |
Total OTTI losses |  | $ | 4,809 |  |  | (36 | ) |  | 4,845 |
Components of Net Realized and Unrealized Gains (Losses) |
($ in thousands) |  | 2019 |  | 2018 |  | 2017
Net realized gains (losses) on the disposals of securities: |  |  |  |  |  |
Fixed income securities |  | $ | 1,910 |  |  | (34,953 | ) |  | 6,944 |
Equity securities |  | 24,844 |  |  | 18,695 |  |  | 4,629 |
Short-term investments |  | (16 | ) |  | (3 | ) |  | (4 | )
Other investments |  | (23 | ) |  | (2,714 | ) |  | (365 | )
Net realized gains (losses) on the disposal of securities |  | 26,715 |  |  | (18,975 | ) |  | 11,204 |
OTTI charges |  | (3,644 | ) |  | (6,579 | ) |  | (4,845 | )
Net realized gains (losses) |  | 23,071 |  |  | (25,554 | ) |  | 6,359 |
Unrealized (losses) recognized in income on equity securities |  | (8,649 | ) |  | (29,369 | ) |  | — |
Total net realized and unrealized investment gains (losses) |  | $ | 14,422 |  |  | (54,923 | ) |  | 6,359 |
Schedule of Components of Net Realized Gains Excluding OTTI Charges |
($ in thousands) |  | 2019 |  | 2018 |  | 2017
HTM fixed income securities |  |  |  |  |  |  |  |  |
Gains |  | $ | 1 |  |  | 2 |  |  | 44 |
Losses |  | (15 | ) |  | — |  |  | (1 | )
AFS fixed income securities |  |  |  |  |  |  |  |  |
Gains |  | 6,899 |  |  | 5,460 |  |  | 10,193 |
Losses |  | (4,975 | ) |  | (40,415 | ) |  | (3,292 | )
Equity securities |  |  |  |  |  |  |  |  |
Gains |  | 24,980 |  |  | 23,203 |  |  | 5,829 |
Losses |  | (136 | ) |  | (4,508 | ) |  | (1,200 | )
Short-term investments |  |  |  |  |  |
Gains |  | 24 |  |  | 7 |  |  | 2 |
Losses |  | (40 | ) |  | (10 | ) |  | (6 | )
Other investments |  |  |  |  |  |  |  |  |
Gains |  | 6 |  |  | — |  |  | 494 |
Losses |  | (29 | ) |  | (2,714 | ) |  | (859 | )
Total net realized investment gains (losses) |  | $ | 26,715 |  |  | (18,975 | ) |  | 11,204 |
Equity Securities [Member] |
Investment [Line Items] |
Unrealized Gain (Loss) on Securities [Table Text Block] |
($ in thousands) |  | 2019 |  | 2018
Unrealized gains (losses) recognized in income on equity securities: |  |  |  |
On securities remaining in our portfolio at December 31, 2019 |  | 1,219 |  |  | (3,098 | )
On securities sold in each respective period |  | (9,868 | ) |  | (26,271 | )
Total unrealized (losses) recognized in income on equity securities |  | $ | (8,649 | ) |  | (29,369 | )

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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 http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563 + Details
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