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Investments (Tables)

12 Months Ended

Dec. 31, 2021

Investment [Line Items]

Schedule of Unrealized Gains (Losses) On Investments

($ in thousands)						2021						2020						2019
AFS securities:
Fixed income securities						$	228,947					386,380						215,634
Total AFS securities						228,947						386,380						215,634
HTM securities:
Fixed income securities						(4)						7						31
Total HTM securities						(4)						7						31
Short-term securities						20						6						23
Total net unrealized gains						228,963						386,393						215,688
Deferred income tax						(48,082)						(81,142)						(45,294)
Net unrealized gains, net of deferred income tax						180,881						305,251						170,394
Increase (decrease) in net unrealized gains in OCI, net of deferred income tax						$	(124,370)					134,857						168,505

Schedule of Available For Sale Securities

December 31, 2021
						Cost/
						Amortized						Allowance for						Unrealized						Unrealized						Fair
($ in thousands)						Cost						Credit Losses						Gains						Losses						Value
AFS fixed income securities:
U.S. government and government agencies						$	127,974					—						3,629						(1,145)						130,458
Foreign government						15,420						(46)						609						(123)						15,860
Obligations of states and political subdivisions						1,121,422						(137)						68,258						(235)						1,189,308
Corporate securities						2,478,348						(6,682)						106,890						(4,953)						2,573,603
CLO and other ABS						1,343,687						(939)						14,350						(6,284)						1,350,814
RMBS						756,280						(1,909)						24,813						(2,932)						776,252
CMBS						647,622						(11)						27,752						(1,682)						673,681
Total AFS fixed income securities						$	6,490,753					(9,724)						246,301						(17,354)						6,709,976

December 31, 2020
						Cost/
						Amortized						Allowance for						Unrealized						Unrealized						Fair
($ in thousands)						Cost						Credit Losses						Gains						Losses						Value
AFS fixed income securities:
U.S. government and government agencies						$	110,038					—						6,239						(137)						116,140
Foreign government						16,801						(1)						1,569						(3)						18,366
Obligations of states and political subdivisions						1,159,588						(4)						87,564						(11)						1,247,137
Corporate securities						2,152,203						(2,782)						180,971						(2,340)						2,328,052
CLO and other ABS						1,014,820						(592)						20,166						(7,843)						1,026,551
RMBS						999,485						(561)						53,065						(201)						1,051,788
CMBS						620,582						(29)						48,348						(1,007)						667,894
Total AFS fixed income securities						$	6,073,517					$	(3,969)					397,922						(11,542)						6,455,928

Schedule of debt securities, available-for-sale, allowance for credit losses

2021			Beginning Balance						Current Provisions for Securities without Prior Allowance						Increase (Decrease) on Securities with Prior Allowance, excluding intent (or Requirements) to Sell Securities						Reductions for Securities Sold						Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period						Ending Balance
($ in thousands)
Foreign Government			$	1					46						(1)						—						—						46
Obligations of states and political subdivisons			4						122						11						—						—						137
Corporate Securities			2,782						5,785						(992)						(723)						(170)						6,682
CLO and other ABS			592						579						(211)						(21)						—						939
RMBS			561						1,593						(63)						(182)						—						1,909
CMBS			29						10						(28)						—						—						11
Total AFS fixed income securities			$	3,969					8,135						(1,284)						(926)						(170)						9,724

2020			Beginning Balance						Current Provisions for Securities without Prior Allowance						Increase (Decrease) on Securities with Prior Allowance, excluding intent (or Requirements) to Sell Securities						Reductions for Securities Sold						Reductions for Securities Identified as Intent (or Requirement) to Sell during the Period						Ending Balance
($ in thousands)
Foreign Government			$	—					19						—						(18)						—						1
Obligations of states and political subdivisons			—						4						—						—						—						4
Corporate Securities			—						3,645						—						(781)						(82)						2,782
CLO and other ABS			—						722						—						(113)						(17)						592
RMBS			—						623						—						(62)						—						561
CMBS			—						29						—						—						—						29
Total AFS fixed income securities			$	—					5,042						—						(974)						(99)						3,969

Schedule of Fair Value and Gross Pre-Tax Net Unrealized/Unrecognized Loss of Securities by Length of Time

December 31, 2021						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						$	34,857					(746)						7,827						(399)						42,684						(1,145)
Foreign government						2,000						(84)						1,061						(39)						3,061						(123)
Obligations of states and political subdivisions						25,837						(235)						—						—						25,837						(235)
Corporate securities						300,549						(4,903)						2,520						(50)						303,069						(4,953)
CLO and other ABS						663,976						(4,934)						53,368						(1,350)						717,344						(6,284)
RMBS						236,010						(2,931)						20						(1)						236,030						(2,932)
CMBS						112,899						(1,016)						20,326						(666)						133,225						(1,682)
Total AFS fixed income securities						$	1,376,128					(14,849)						85,122						(2,505)						1,461,250						(17,354)

December 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:
U.S. government and government agencies						$	11,519					(137)						—						—						11,519						(137)
Foreign government						1,122						(3)						—						—						1,122						(3)
Obligations of states and political subdivisions						2,223						(11)						—						—						2,223						(11)
Corporate securities						65,187						(2,152)						2,400						(188)						67,587						(2,340)
CLO and other ABS						261,746						(2,995)						165,661						(4,848)						427,407						(7,843)
RMBS						18,227						(194)						1,181						(7)						19,408						(201)
CMBS						55,482						(616)						16,093						(391)						71,575						(1,007)
Total AFS fixed income securities						$	415,506					(6,108)						185,335						(5,434)						600,841						(11,542)

Schedule of Investments Classified by Contractual Maturity Date

						AFS						HTM
($ in thousands)						Fair Value						Carrying Value						Fair Value
Due in one year or less						$	500,579					1,384						1,401
Due after one year through five years						3,182,282						11,811						12,493
Due after five years through 10 years						2,316,389						15,590						15,566
Due after 10 years						710,726						—						—
Total fixed income securities						$	6,709,976					28,785						29,460

Schedule of Other Investment Portfolio by Strategy and the Remaining Commitment Amount Associated With Each Strategy

Other Investments						December 31, 2021																		December 31, 2020
($ in thousands)						Carrying Value						Remaining Commitment						Maximum Exposure to Loss1						Carrying Value						Remaining Commitment						Maximum Exposure to Loss1
Alternative Investments
Private equity						$	273,070					99,734						372,804						157,276						100,905						258,181
Private credit						63,138						92,674						155,812						54,017						98,330						152,347
Real assets						23,524						22,579						46,103						19,659						16,493						36,152
Total alternative investments						359,732						214,987						574,719						230,952						215,728						446,680
Other securities						49,300						—						49,300						35,370						—						35,370
Total other investments						$	409,032					214,987						624,019						266,322						215,728						482,050

Schedule of Aggregated Summarized Balance Sheet Financial Information For Partnerships In Our Alternative Investment Portfolio

Balance Sheet Information
December 31,
($ in millions)						2021						2020
Investments						$	107,347					55,145
Total assets						112,232						58,819
Total liabilities						12,371						6,744
Total partners’ capital						99,861						52,075

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)						2021						2020						2019
Net investment (loss) income						$	653					(26)						(8)
Realized gains						6,121						1,452						695
Net change in unrealized appreciation						26,877						4,898						5,543
Net income before tax						$	33,651					6,324						6,230
Alternative investment income included in "Net investment income earned" on our Consolidated Statements of Income						117.7						26.5						17.9

Schedule Of Securities Pledged As Collateral

($ in millions)						FHLBI Collateral						FHLBNY Collateral						State and Regulatory Deposits						Total
U.S. government and government agencies						$	—					—						22.3						22.3
Obligations of states and political subdivisions						—						—						4.0						4.0
RMBS						62.4						40.4						—						102.8
CMBS						6.3						14.1						—						20.4
Total pledged as collateral						$	68.7					54.5						26.3						149.5

Schedule of Components of Pre-Tax Net Investment Income Earned

($ in thousands)						2021						2020						2019
Fixed income securities						$	209,709					203,926						203,255
CMLs						2,743						844						—
Equity securities						15,920						9,286						6,996
Short-term investments						260						1,821						6,653
Other investments						118,060						26,922						18,778
Investment expenses						(20,103)						(15,692)						(13,139)
Net investment income earned						$	326,589					227,107						222,543

Schedule of realized and unrealized gains (losses) on securities

($ in thousands)						2021						2020						2019
Gross gains on sales						$	15,284					18,893						31,910
Gross losses on sales						(8,140)						(9,745)						(5,195)
Net realized gains on disposals						7,144						9,148						26,715
Net unrealized gains (losses) on equity securities						17,881						7,939						(8,649)
Net credit loss (expense) on fixed maturities, AFS						(6,858)						(5,042)
Net credit loss (expense) benefit on fixed maturities, HTM						(49)						4
Losses on securities for which we have the intent to sell						(519)						(16,266)
Net other-than-temporary-impairment ("OTTI") losses recognized in earnings																		(3,644)
Net realized and unrealized gains (losses)						$	17,599					(4,217)						14,422

Unrealized Gain (Loss) on Equity Securities

($ in thousands)						2021						2020						2019
Unrealized gains (losses) recognized in income on equity securities:
On securities remaining in our portfolio at end of period						$	16,473					7,936						1,219
On securities sold in period						1,408						3						(9,868)
Total unrealized gains (losses) recognized in income on equity securities						$	17,881					7,939						(8,649)

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