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Investments (Tables)
 3 Months Ended
Mar. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]  
Schedule of Available-for-sale Securities
March 31, 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
 
$
134,569

 
—

 
7,668

 
—

 
142,237

Foreign government
 
12,987

 
(21
)
 
172

 
(252
)
 
12,886

Obligations of states and political subdivisions
 
1,146,160

 
(29
)
 
52,516

 
(1,434
)
 
1,197,213

Corporate securities
 
1,911,377

 
(13,412
)
 
44,397

 
(32,858
)
 
1,909,504

Collateralized loan obligations ("CLO") and other asset-backed securities ("ABS")
 
789,240

 
(1,565
)
 
2,084

 
(67,498
)
 
722,261

Commercial mortgage-backed securities ("CMBS")
 
516,702

 
(38
)
 
26,511

 
(12,142
)
 
531,033

Residential mortgage-backed securities ("RMBS")
 
1,366,744

 
(722
)
 
66,931

 
(2,727
)
 
1,430,226

Total AFS fixed income securities
 
$
5,877,779

 
(15,787
)
 
200,279

 
(116,911
)
 
5,945,360

 
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

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
Debt Securities, Available-for-sale, Allowance for Credit Loss [Table Text Block]
March 31, 2020
 
 
 
 
 
 
 
 
 
 
 
 
($ in thousands)
 
Beginning Balance
 
Current Provision for Securities without Prior Allowance
 
Increase or (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
 
—

 
21

 
—

 
—

 
—

 
21

Obligations of states and political subdivisions
 
—

 
29

 
—

 
—

 
—

 
29

Corporate securities
 
—

 
13,412

 
—

 
—

 
—

 
13,412

CLO and other ABS
 
—

 
1,565

 
—

 
—

 
—

 
1,565

CMBS
 
—

 
38

 
—

 
—

 
—

 
38

RMBS
 
—

 
722

 
—

 
—

 
—

 
722

Total AFS fixed income securities
 
$
—

 
15,787

 
—

 
—

 
—

 
15,787
Schedule of Fair Value and Gross Pre-Tax Net Unrealized Loss of Securities by Length of Time, AFS
March 31, 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:
 
 

 
 

 
 

 
 

 
 
 
 
Foreign government
 
4,376

 
(252
)
 
—

 
—

 
4,376

 
(252
)
Obligations of states and political subdivisions
 
70,830

 
(1,434
)
 
—

 
—

 
70,830

 
(1,434
)
Corporate securities
 
553,419

 
(31,677
)
 
8,185

 
(1,181
)
 
561,604

 
(32,858
)
CLO and other ABS
 
445,676

 
(49,404
)
 
136,413

 
(18,094
)
 
582,089

 
(67,498
)
CMBS
 
144,010

 
(11,119
)
 
11,373

 
(1,023
)
 
155,383

 
(12,142
)
RMBS
 
71,741

 
(2,561
)
 
1,974

 
(166
)
 
73,715

 
(2,727
)
Total AFS fixed income securities
 
$
1,290,052

 
(96,447
)
 
157,945

 
(20,464
)
 
1,447,997

 
(116,911
)

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
)
 
Schedule of Fixed Maturity Securities By Contractual Maturities
 
 
AFS
 
HTM
($ in thousands)
 
Fair Value
 
Carrying Value
 
Fair Value
Due in one year or less
 
$
295,885

 
929

 
965

Due after one year through five years
 
3,471,503

 
13,943

 
15,115

Due after five years through 10 years
 
1,925,970

 
5,508

 
5,841

Due after 10 years
 
252,002

 
—

 
—

Total fixed income securities
 
$
5,945,360

 
20,380

 
21,921
Schedule of Other Investment Portfolio By Strategy And Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy
Other Investments
 
March 31, 2020
 
December 31, 2019
($ in thousands)
 
Carrying Value
 
Remaining Commitment
 
Maximum Exposure to Loss1
 
Carrying Value
 
Remaining Commitment
 
Maximum Exposure to Loss1
Alternative Investments
 
 

 
 

 
 
 
 
 
 
 
 
   Private equity
 
$
131,936

 
102,801

 
234,737

 
118,352

 
93,138

 
211,490

   Private credit
 
46,515

 
101,587

 
148,102

 
42,532

 
105,340

 
147,872

   Real assets
 
23,385

 
23,406

 
46,791

 
23,256

 
20,741

 
43,997

Total alternative investments
 
201,836

 
227,794

 
429,630

 
184,140

 
219,219

 
403,359

Other securities
 
43,098

 
—

 
43,098

 
32,667

 
—

 
32,667

Total other investments
 
$
244,934

 
227,794

 
472,728

 
216,807

 
219,219

 
436,026


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 March 31,
($ in millions)
 
2020
 
2019
Net investment (loss) income
 
$
12.7


(150.0
)
Realized (losses) gains
 
164.8


143.3

Net change in unrealized appreciation (depreciation)
 
1,204.0


554.3

Net income
 
$
1,381.5


547.6

Insurance Subsidiaries’ alternative investments income
 
$
6.3

 
0.6


 
Schedule of Securities Pledged As Collateral
($ in millions)
 
FHLBI Collateral
 
FHLBNY Collateral
 
State and Regulatory Deposits
 
Total
U.S. government and government agencies
 
$
—

 
—

 
23.4

 
23.4

Obligations of states and political subdivisions
 
—

 
—

 
4.0

 
4.0

Corporate securities
 
—

 
—

 
0.3

 
0.3

CMBS
 
7.1

 
28.1

 
—

 
35.2

RMBS
 
139.7

 
225.7

 
—

 
365.4

Total pledged as collateral
 
$
146.8

 
253.8

 
27.7


428.3
Schedule of Pre-Tax Net Investment Income Earned
 
 
Quarter Ended March 31,
($ in thousands)
 
2020
 
2019
Fixed income securities
 
$
50,253


49,033

CMLs
 
62

 
—

Equity securities
 
1,552


1,640

Short-term investments
 
1,166


2,044

Other investments
 
6,342


660

Investment expenses
 
(3,408
)

(2,759
)
Net investment income earned
 
$
55,967

 
50,618
Schedule Of O T T I By Asset Type [Table Text Block]
 
 
Quarter Ended March 31,
 
 
2020
 
2019
($ in thousands)
 
Credit Loss Expense
 
Other Impairment Charges
 
Recognized in Earnings
 
Recognized in Earnings
AFS fixed income securities:
 
 
 
 
 
 
 
 
U.S. government and government agencies
 
—

 
14

 
14

 
—

Foreign government
 
21

 
—

 
21

 
—

Obligations of states and political subdivisions
 
29

 
62

 
91

 
65

Corporate securities
 
13,412

 
11,603

 
25,015

 
—

CLO and other ABS
 
1,565

 
2,000

 
3,565

 
—

CMBS
 
38

 
1,852

 
1,890

 
—

RMBS
 
722

 
71

 
793

 
—

Total AFS fixed income securities
 
15,787

 
15,602

 
31,389

 
65

CMLs
 
240

 
—

 
240

 
—

Other Investments
 
—

 
—

 
—

 
39

Total OTTI
 
16,027

 
15,602

 
31,629

 
104
Schedule of Components of Net Realized and Unrealized Gains and Losses Excluding OTTI Charges
 
 
Quarter Ended March 31,
($ in thousands)
 
2020
 
2019
Net realized gains (losses) on the disposals of securities:
 
 
 
 
Fixed income securities
 
$
4,276

 
1,143

Equity securities
 
(3
)
 
2,280

Short-term investments
 
(168
)
 
14

Other investments
 
(5
)
 
7

Net realized gains (losses) on the disposal of securities
 
4,100

 
3,444

OTTI charges
 
(31,629
)
 
(104
)
Net realized gains (losses)
 
(27,529
)
 
3,340

Unrealized (losses) gains recognized in income on equity securities
 
(17,137
)
 
10,111

Total net realized and unrealized investment (losses) gains
 
$
(44,666
)
 
13,451
Schedule of Realized Gains and Losses on Disposals of Securities
 
 
Quarter Ended March 31,
($ in thousands)
 
2020
 
2019
HTM fixed income securities
 
 
 
 
Gains
 
$
1

 
—

Losses
 
—

 
—

AFS fixed income securities
 
 

 
 

Gains
 
5,653

 
1,844

Losses
 
(1,378
)
 
(701
)
Equity securities
 
 

 
 

Gains
 
—

 
2,280

Losses
 
(3
)
 
—

Short-term investments
 
 
 
 
Gains
 
22

 
14

Losses
 
(190
)
 
—

Other investments
 
 
 
 
Gains
 
—

 
7

Losses
 
(5
)

—

Total net realized gains on disposals of securities
 
$
4,100


3,444
Equity Securities [Member]  
Schedule of Held-to-maturity Securities [Line Items]  
Schedule of Components of Net Realized and Unrealized Gains and Losses Excluding OTTI Charges
 
 
Quarter Ended March 31,
($ in thousands)
 
2020
 
2019
Unrealized (losses) gains recognized in income on equity securities:
 
 
 
 
On securities remaining in our portfolio at March 31, 2020
 
$
(17,140
)
 
12,055

On securities sold in each respective period
 
3

 
(1,944
)
Total unrealized (losses) gains recognized in income on equity securities
 
$
(17,137
)
 
10,111