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Investments (Tables) | 12 Months Ended
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Dec. 31, 2018
Investment [Line Items] |
Schedule of Unrealized Gains On Investments |
($ in thousands) |  | 2018 |  | 2017 |  | 2016
AFS securities: |  |  |  |  |  |  |  |  |
Fixed income securities |  | $ | 2,302 |  |  | 85,806 |  |  | 38,781 |
Equity securities |  | — |  |  | 38,894 |  |  | 25,864 |
Total AFS securities |  | 2,302 |  |  | 124,700 |  |  | 64,645 |
HTM securities: |  |  |  |  |  |  |  |  |
Fixed income securities |  | 89 |  |  | (21 | ) |  | 159 |
Total HTM securities |  | 89 |  |  | (21 | ) |  | 159 |
Total net unrealized gains |  | 2,391 |  |  | 124,679 |  |  | 64,804 |
Deferred income tax |  | (502 | ) |  | (44,103 | ) |  | (22,681 | )
Net unrealized gains, net of deferred income tax |  | 1,889 |  |  | 80,576 |  |  | 42,123 |
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 |  | $ | (65,881 | ) |  | 38,453 |  |  | (2,873 | )
Schedule of Held-to-maturity Securities |
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 |
December 31, 2017 |  |  |  | Net |  |  |  |  |  |  |  |
|  |  |  | Unrealized |  |  |  | Unrecognized |  | Unrecognized |  |
|  | Amortized |  | Gains |  | Carrying |  | Holding |  | Holding |  | Fair
($ in thousands) |  | Cost |  | (Losses) |  | Value |  | Gains |  | Losses |  | Value
Obligations of state and political subdivisions |  | 25,154 |  |  | 84 |  |  | 25,238 |  |  | 1,023 |  |  | — |  |  | 26,261 |
Corporate securities |  | 16,996 |  |  | (105 | ) |  | 16,891 |  |  | 1,003 |  |  | (55 | ) |  | 17,839 |
Total HTM fixed income securities |  | $ | 42,150 |  |  | (21 | ) |  | 42,129 |  |  | 2,026 |  |  | (55 | ) |  | 44,100 |
Schedule of Available For Sale Securities |
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 |
December 31, 2017 |  |  |  |  |  |  |  |
|  | Cost/ |  |  |  |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair
($ in thousands) |  | Cost |  | Gains |  | Losses |  | Value
AFS fixed income securities: |  |  |  |  |  |  |  |
U.S. government and government agencies |  | $ | 49,326 |  |  | 647 |  |  | (233 | ) |  | 49,740 |
Foreign government |  | 18,040 |  |  | 526 |  |  | (11 | ) |  | 18,555 |
Obligations of states and political subdivisions |  | 1,539,307 |  |  | 44,245 |  |  | (582 | ) |  | 1,582,970 |
Corporate securities |  | 1,588,339 |  |  | 30,891 |  |  | (1,762 | ) |  | 1,617,468 |
CLO and other ABS |  | 789,152 |  |  | 6,508 |  |  | (202 | ) |  | 795,458 |
CMBS |  | 382,727 |  |  | 1,563 |  |  | (841 | ) |  | 383,449 |
RMBS |  | 709,825 |  |  | 6,487 |  |  | (1,430 | ) |  | 714,882 |
Total AFS fixed income securities |  | 5,076,716 |  |  | 90,867 |  |  | (5,061 | ) |  | 5,162,522 |
AFS equity securities: |  |  |  |  |  |  |  |
Common stock |  | 129,696 |  |  | 38,287 |  |  | (226 | ) |  | 167,757 |
Preferred stock |  | 14,115 |  |  | 904 |  |  | (71 | ) |  | 14,948 |
Total AFS equity securities |  | 143,811 |  |  | 39,191 |  |  | (297 | ) |  | 182,705 |
Total AFS securities |  | $ | 5,220,527 |  |  | 130,058 |  |  | (5,358 | ) |  | 5,345,227 |
Schedule of Fair Value and Gross Pre-Tax Net Unrealized/Unrecognized Loss of Securities by Length of Time |
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 | )
December 31, 2017 |  | 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 |  | $ | 23,516 |  |  | (233 | ) |  | 250 |  |  | — |  |  | 23,766 |  |  | (233 | )
Foreign government |  | 1,481 |  |  | (11 | ) |  | — |  |  | — |  |  | 1,481 |  |  | (11 | )
Obligations of states and political subdivisions |  | 107,514 |  |  | (422 | ) |  | 14,139 |  |  | (160 | ) |  | 121,653 |  |  | (582 | )
Corporate securities |  | 238,326 |  |  | (1,744 | ) |  | 3,228 |  |  | (18 | ) |  | 241,554 |  |  | (1,762 | )
CLO and other ABS |  | 74,977 |  |  | (196 | ) |  | 1,655 |  |  | (6 | ) |  | 76,632 |  |  | (202 | )
CMBS |  | 154,267 |  |  | (773 | ) |  | 5,214 |  |  | (68 | ) |  | 159,481 |  |  | (841 | )
RMBS |  | 269,485 |  |  | (1,285 | ) |  | 11,200 |  |  | (145 | ) |  | 280,685 |  |  | (1,430 | )
Total AFS fixed income securities |  | 869,566 |  |  | (4,664 | ) |  | 35,686 |  |  | (397 | ) |  | 905,252 |  |  | (5,061 | )
AFS equity securities: |  |  |  |  |  |  |  |  |  |  |  |
Common stock |  | 4,727 |  |  | (226 | ) |  | — |  |  | — |  |  | 4,727 |  |  | (226 | )
Preferred stock |  | 3,833 |  |  | (71 | ) |  | — |  |  | — |  |  | 3,833 |  |  | (71 | )
Total AFS equity securities |  | 8,560 |  |  | (297 | ) |  | — |  |  | — |  |  | 8,560 |  |  | (297 | )
Total AFS securities |  | $ | 878,126 |  |  | (4,961 | ) |  | 35,686 |  |  | (397 | ) |  | 913,812 |  |  | (5,358 | )
Schedule of Investments Classified by Contractual Maturity Date |
|  | AFS |  | HTM
($ in thousands) |  | Fair Value |  | Carrying Value |  | Fair Value
Due in one year or less |  | $ | 188,309 |  |  | 13,502 |  |  | 13,693 |
Due after one year through five years |  | 2,040,395 |  |  | 17,308 |  |  | 18,260 |
Due after five years through 10 years |  | 2,863,528 |  |  | 6,300 |  |  | 6,364 |
Due after 10 years |  | 180,868 |  |  | — |  |  | — |
Total fixed income securities |  | $ | 5,273,100 |  |  | 37,110 |  |  | 38,317 |
Schedule of Other Investment Portfolio by Strategy and the Remaining Commitment Amount Associated With Each Strategy |
Other Investments |  | December 31, 2018 |  | December 31, 2017
($ in thousands) |  | Carrying Value |  | Remaining Commitment |  | Maximum Exposure to Loss 1 |  | Carrying Value |  | Remaining Commitment |  | Maximum Exposure to Loss 1
Alternative Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Private equity |  | $ | 84,352 |  |  | 93,688 |  |  | 178,040 |  |  | 52,251 |  |  | 99,026 |  |  | 151,277 |
Private credit |  | 41,682 |  |  | 81,453 |  |  | 123,135 |  |  | 37,743 |  |  | 94,959 |  |  | 132,702 |
Real assets |  | 27,862 |  |  | 27,129 |  |  | 54,991 |  |  | 25,379 |  |  | 27,014 |  |  | 52,393 |
Total alternative investments |  | 153,896 |  |  | 202,270 |  |  | 356,166 |  |  | 115,373 |  |  | 220,999 |  |  | 336,372 |
Other securities 2 |  | 25,042 |  |  | — |  |  | 25,042 |  |  | 16,895 |  |  | — |  |  | 16,895 |
Total other investments |  | $ | 178,938 |  |  | 202,270 |  |  | 381,208 |  |  | 132,268 |  |  | 220,999 |  |  | 353,267 |
Schedule of Aggregated Summarized Balance Sheet Financial Information For Partnerships In Our Alternative Investment Portfolio |
Balance Sheet Information |  |  |  |
September 30, |  |  |  |
($ in millions) |  | 2018 |  | 2017
Investments |  | $ | 28,292 |  |  | 21,046 |
Total assets |  | 30,377 |  |  | 22,357 |
Total liabilities |  | 4,532 |  |  | 4,767 |
Total partners’ capital |  | 25,845 |  |  | 17,590 |
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) |  | 2018 |  | 2017 |  | 2016
Net investment income (loss) |  | $ | 134 |  |  | (143 | ) |  | (44 | )
Realized gains |  | 1,981 |  |  | 325 |  |  | 1,374 |
Net change in unrealized appreciation (depreciation) |  | 1,303 |  |  | 2,894 |  |  | (719 | )
Net income |  | $ | 3,418 |  |  | 3,076 |  |  | 611 |
Insurance Subsidiaries' alternative investments income (loss) |  | 17.6 |  |  | 12.7 |  |  | 3.1 |
Schedule Of Securities Pledged As Collateral |
($ in millions) |  | FHLBI Collateral |  | FHLBNY Collateral |  | State and Regulatory Deposits |  | Total
U.S. government and government agencies |  | $ | — |  |  | — |  |  | 22.5 |  |  | 22.5 |
Obligations of states and political subdivisions |  | — |  |  | — |  |  | 3.9 |  |  | 3.9 |
Corporate securities |  | — |  |  | — |  |  | 0.3 |  |  | 0.3 |
CMBS |  | 7.2 |  |  | 18.1 |  |  | — |  |  | 25.3 |
RMBS |  | 58.0 |  |  | 45.5 |  |  | — |  |  | 103.5 |
Total pledged as collateral |  | $ | 65.2 |  |  | 63.6 |  |  | 26.7 |  |  | 155.5 |
Schedule of Components of Pre-Tax Net Investment Income Earned |
($ in thousands) |  | 2018 |  | 2017 |  | 2016
Fixed income securities |  | $ | 178,104 |  |  | 153,230 |  |  | 129,306 |
Equity securities |  | 7,764 |  |  | 6,442 |  |  | 7,368 |
Short-term investments |  | 3,472 |  |  | 1,526 |  |  | 686 |
Other investments |  | 17,799 |  |  | 12,871 |  |  | 2,940 |
Investment expenses |  | (11,803 | ) |  | (12,187 | ) |  | (9,546 | )
Net investment income earned |  | $ | 195,336 |  |  | 161,882 |  |  | 130,754 |
Schedule of OTTI by Asset Type |
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 |
2016 |  |  |  |  |  | Recognized in Earnings
($ in thousands) |  | Gross |  | Included in OCI |
AFS fixed income securities: |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisons |  | $ | 2,797 |  |  | — |  |  | 2,797 |
CLO and other ABS |  | 19 |  |  | — |  |  | 19 |
Corporate securities |  | 1,880 |  |  | — |  |  | 1,880 |
CMBS |  | 220 |  |  | — |  |  | 220 |
RMBS |  | 275 |  |  | 10 |  |  | 265 |
Total AFS fixed income securities |  | 5,191 |  |  | 10 |  |  | 5,181 |
AFS equity securities: |  |  |  |  |  |
Common stock |  | 3,316 |  |  | — |  |  | 3,316 |
Preferred stock |  | 2 |  |  | — |  |  | 2 |
Total AFS equity securities |  | 3,318 |  |  | — |  |  | 3,318 |
Total OTTI losses |  | $ | 8,509 |  |  | 10 |  |  | 8,499 |
Components of Net Realized and Unrealized Gains (Losses) |
($ in thousands) |  | 2018 |  | 2017 |  | 2016
Net realized (losses) gains on the disposals of securities: |  |  |  |  |  |
Fixed income securities |  | $ | (34,953 | ) |  | 6,944 |  |  | (3,668 | )
Equity securities |  | 18,695 |  |  | 4,629 |  |  | 7,244 |
Short-term investments |  | (3 | ) |  | (4 | ) |  | (13 | )
Other investments |  | (2,714 | ) |  | (365 | ) |  | (1 | )
Net realized (losses) gains on the disposal of securities |  | (18,975 | ) |  | 11,204 |  |  | 3,562 |
OTTI charges |  | (6,579 | ) |  | (4,845 | ) |  | (8,499 | )
Net realized (losses) gains |  | (25,554 | ) |  | 6,359 |  |  | (4,937 | )
Unrealized (losses) recognized in income on equity securities 1 |  | (29,369 | ) |  | — |  |  | — |
Total net realized and unrealized investment (losses) gains |  | $ | (54,923 | ) |  | 6,359 |  |  | (4,937 | )
1 Includes unrealized holding gains (losses) of: (i) $(3.1) million on equity securities remaining in our portfolio as of December 31, 2018; and (ii) $(26.3) million on equity securities sold in 2018.
Schedule of Components of Net Realized Gains Excluding OTTI Charges |
($ in thousands) |  | 2018 |  | 2017 |  | 2016
HTM fixed income securities |  |  |  |  |  |  |  |  |
Gains |  | $ | 2 |  |  | 44 |  |  | 3 |
Losses |  | — |  |  | (1 | ) |  | (1 | )
AFS fixed income securities |  |  |  |  |  |  |  |  |
Gains |  | 5,460 |  |  | 10,193 |  |  | 7,741 |
Losses |  | (40,415 | ) |  | (3,292 | ) |  | (11,411 | )
Equity securities |  |  |  |  |  |  |  |  |
Gains |  | 23,203 |  |  | 5,829 |  |  | 8,108 |
Losses |  | (4,508 | ) |  | (1,200 | ) |  | (864 | )
Short-term investments |  |  |  |  |  |
Gains |  | 7 |  |  | 2 |  |  | — |
Losses |  | (10 | ) |  | (6 | ) |  | (13 | )
Other investments |  |  |  |  |  |  |  |  |
Gains |  | — |  |  | 494 |  |  | 3 |
Losses |  | (2,714 | ) |  | (859 | ) |  | (4 | )
Total net realized investment (losses) gains |  | $ | (18,975 | ) |  | 11,204 |  |  | 3,562 |

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