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Investments (Tables)
 6 Months Ended
Jun. 30, 2019
Investments [Line Items]  
Schedule of Available-for-sale Securities
June 30, 2019
 
 
 
 
 
 
 
 
($ in thousands)
 
Cost/
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
AFS fixed income securities:
 
 
 
 
 
 
 
 
U.S. government and government agencies
 
$
143,461

 
3,683

 
(20
)
 
147,124

Foreign government
 
20,995

 
494

 
—

 
21,489

Obligations of states and political subdivisions
 
1,056,507

 
54,516

 
(6
)
 
1,111,017

Corporate securities
 
1,733,319

 
64,620

 
(4,402
)
 
1,793,537

Collateralized loan obligations and other asset-backed securities ("CLO and other ABS")
 
762,896

 
8,649

 
(3,941
)
 
767,604

Commercial mortgage-backed securities ("CMBS")
 
541,093

 
24,737

 
(237
)
 
565,593

Residential mortgage-backed securities (“RMBS”)
 
1,313,220

 
38,588

 
(274
)
 
1,351,534

Total AFS fixed income securities
 
$
5,571,491

 
195,287

 
(8,880
)
 
5,757,898

December 31, 2018
 
 
 
 
 
 
 
 
($ in thousands)
 
Cost/
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
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 Loss of Securities by Length of Time, AFS
June 30, 2019
 
Less than 12 months
 
12 months or longer
 
Total
($ in thousands)
 
Fair Value
 
Unrealized
Losses1
 
Fair Value
 
Unrealized
Losses1
 
Fair Value
 
Unrealized
Losses1
AFS fixed income securities:
 
 

 
 

 
 

 
 

 
 
 
 
U.S. government and government agencies
 
$
—

 
—

 
5,508

 
(20
)
 
5,508

 
(20
)
Obligations of states and political subdivisions
 
739

 
(6
)
 
—

 
—

 
739

 
(6
)
Corporate securities
 
94,964

 
(2,260
)
 
46,527

 
(2,142
)
 
141,491

 
(4,402
)
CLO and other ABS
 
231,823

 
(2,318
)
 
151,572

 
(1,623
)
 
383,395

 
(3,941
)
CMBS
 
59,639

 
(183
)
 
24,882

 
(54
)
 
84,521

 
(237
)
RMBS
 
34,107

 
(135
)
 
14,691

 
(139
)
 
48,798

 
(274
)
Total AFS fixed income securities
 
$
421,272

 
(4,902
)
 
243,180

 
(3,978
)
 
664,452

 
(8,880
)
December 31, 2018
 
Less than 12 months
 
12 months or longer
 
Total
($ in thousands)
 
Fair
Value
 
Unrealized
Losses1
 
Fair Value
 
Unrealized
Losses1
 
Fair Value
 
Unrealized
Losses1
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
)
  1 Gross unrealized losses include non-OTTI unrealized amounts and OTTI losses recognized in AOCI. 

Schedule of Fixed Maturity Securities By Contractual Maturities
 
 
AFS
 
HTM
($ in thousands)
 
Fair Value
 
Carrying Value
 
Fair Value
Due in one year or less
 
$
280,140

 
9,480

 
9,526

Due after one year through five years
 
2,237,395

 
16,860

 
18,109

Due after five years through 10 years
 
3,065,577

 
6,024

 
6,220

Due after 10 years
 
174,786

 
—

 
—

Total fixed income securities
 
$
5,757,898

 
32,364

 
33,855
Schedule of Other Investment Portfolio By Strategy And Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy
Other Investments
 
June 30, 2019
 
December 31, 2018
($ in thousands)
 
Carrying Value
 
Remaining Commitment
 
Maximum Exposure to Loss1
 
Carrying Value
 
Remaining Commitment
 
Maximum Exposure to Loss1
Alternative Investments
 
 

 
 

 
 
 
 
 
 
 
 
   Private equity
 
$
99,567

 
95,805

 
195,372

 
84,352

 
93,688

 
178,040

   Private credit
 
35,103

 
113,133

 
148,236

 
41,682

 
81,453

 
123,135

   Real assets
 
23,104

 
22,880

 
45,984

 
27,862

 
27,129

 
54,991

Total alternative investments
 
157,774

 
231,818

 
389,592

 
153,896

 
202,270

 
356,166

Other securities
 
24,335

 
—

 
24,335

 
25,042

 
—

 
25,042

Total other investments
 
$
182,109

 
231,818

 
413,927

 
178,938

 
202,270

 
381,208


1The 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 June 30,
 
Six Months ended June 30,
($ in millions)
 
2019
 
2018
 
2019
 
2018
Net investment income (loss)
 
$
174.1


(6.4
)
 
24.1

 
(41.8
)
Realized gains
 
106.0


629.5

 
249.3

 
1,223.5

Net change in unrealized appreciation (depreciation)
 
2,223.7


(1,200.2
)
 
2,778.0

 
(738.6
)
Net income (loss)
 
$
2,503.8


(577.1
)
 
3,051.4

 
443.1

Insurance subsidiaries’ alternative investments income
 
$
7.3

 
1.9

 
7.9

 
3.5


 
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
 
—

 
—

 
3.9

 
3.9

Corporate securities
 
—

 
—

 
0.3

 
0.3

CMBS
 
7.3

 
21.1

 
—

 
28.4

RMBS
 
58.1

 
84.2

 
—

 
142.3

Total pledged as collateral
 
$
65.4

 
105.3

 
27.0


197.7
Schedule of Pre-Tax Net Investment Income Earned
 
 
Quarter ended June 30,
 
Six Months ended June 30,
($ in thousands)
 
2019
 
2018
 
2019
 
2018
Fixed income securities
 
$
50,907


43,774

 
99,940

 
85,815

Equity securities
 
1,740


1,820

 
3,380

 
3,797

Short-term investments
 
1,759


611

 
3,803

 
1,134

Other investments
 
7,494


2,094

 
8,154

 
3,657

Investment expenses
 
(3,395
)

(2,746
)
 
(6,154
)
 
(5,619
)
Net investment income earned
 
$
58,505

 
45,553

 
109,123

 
88,784
Schedule of Components of Net Realized and Unrealized Gains and Losses Excluding OTTI Charges
 
 
Quarter ended June 30,
 
Six Months ended June 30,
($ in thousands)
 
2019
 
2018
 
2019
 
2018
Net realized gains (losses) on the disposals of securities:
 
 
 
 
 
 
 
 
Fixed income securities
 
$
2,061

 
(1,174
)
 
3,204

 
(4,509
)
Equity securities
 
851

 
1,226

 
3,131

 
9,295

Short-term investments
 
1

 
2

 
15

 
(1
)
Other investments
 
(30
)
 
—

 
(23
)
 
—

Net realized gains on the disposal of securities
 
2,883

 
54

 
6,327

 
4,785

OTTI charges
 
(971
)
 
(2,821
)
 
(1,075
)
 
(4,033
)
Net realized gains (losses)
 
1,912

 
(2,767
)
 
5,252

 
752

Unrealized gains (losses) recognized in income on equity securities
 
2,115

 
1,115

 
12,226

 
(12,953
)
Total net realized and unrealized investment gains (losses)
 
$
4,027

 
(1,652
)
 
$
17,478

 
(12,201
)
Schedule of Realized Gains and Losses on Disposals of Securities
 
 
Quarter ended June 30,
 
Six Months ended June 30,
($ in thousands)
 
2019
 
2018
 
2019
 
2018
HTM fixed income securities
 
 
 
 
 
 
 
 
Gains
 
$
1

 
—

 
1

 
2

Losses
 
(15
)
 
—

 
(15
)
 
—

AFS fixed income securities
 
 

 
 

 
 
 
 
Gains
 
2,643

 
1,971

 
4,487

 
4,594

Losses
 
(568
)
 
(3,145
)
 
(1,269
)
 
(9,105
)
Equity securities
 
 

 
 

 
 
 
 
Gains
 
958

 
1,226

 
3,238

 
9,625

Losses
 
(107
)
 
—

 
(107
)
 
(330
)
Short-term investments
 
 
 
 
 
 
 
 
Gains
 
2

 
2

 
16

 
3

Losses
 
(1
)
 
—

 
(1
)
 
(4
)
Other investments
 
 
 
 
 
 
 
 
Gains
 
—

 
—

 
7

 
—

      Losses
 
(30
)

—

 
(30
)
 
—

Total net realized gains on disposals of securities
 
$
2,883


54

 
6,327

 
4,785
Equity Securities [Member]  
Investments [Line Items]  
Schedule of Components of Net Realized and Unrealized Gains and Losses Excluding OTTI Charges
 
 
Quarter ended June 30,
 
Six Months ended June 30,
($ in thousands)
 
2019
 
2018
 
2019
 
2018
Unrealized gains (losses) recognized in income on equity securities:
 
 
 
 
 
 
 
 
On securities remaining in our portfolio at June 30, 2019
 
$
2,394

 
2,301

 
11,817

 
(2,662
)
On securities sold in each respective period
 
(279
)
 
(1,186
)
 
409

 
(10,291
)
Total unrealized gains (losses) recognized in income on equity securities
 
$
2,115

 
1,115

 
$
12,226


(12,953
)