XML 74 R63.htm IDEA: XBRL DOCUMENT v3.23.2

Investments - Fixed Maturities and Equity Securities (Details) - USD ($) $ in Millions	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Available-for-sale securities
Amortized cost, fixed maturities	$ 70,981.2		$ 70,263.1
Gross unrealized gains, fixed maturities	451.1		512.6
Gross unrealized losses, fixed maturities	7,182.0		7,878.0
Allowance, fixed maturities	8.5	$ 4.1	7.8	$ 12.5	$ 20.4	$ 15.5
Fair value, fixed maturities	64,241.8		62,889.9
Accrued interest receivable	611.7		578.0
U.S. government and agencies
Available-for-sale securities
Amortized cost, fixed maturities	1,884.2		1,990.9
Gross unrealized gains, fixed maturities	0.3		0.1
Gross unrealized losses, fixed maturities	237.1		251.2
Fair value, fixed maturities	1,647.4		1,739.8
Non-U.S. governments
Available-for-sale securities
Amortized cost, fixed maturities	572.8		611.2
Gross unrealized gains, fixed maturities	17.6		20.9
Gross unrealized losses, fixed maturities	58.1		64.8
Fair value, fixed maturities	532.3		567.3
States and political subdivisions
Available-for-sale securities
Amortized cost, fixed maturities	7,556.1		7,355.4
Gross unrealized gains, fixed maturities	24.3		13.7
Gross unrealized losses, fixed maturities	1,040.9		1,136.8
Fair value, fixed maturities	6,539.5		6,232.3
Corporate debt securities
Available-for-sale securities
Amortized cost, fixed maturities	39,453.6		40,370.4
Gross unrealized gains, fixed maturities	384.2		461.0
Gross unrealized losses, fixed maturities	4,114.4		4,640.5
Allowance, fixed maturities	8.4	4.0	7.7	$ 12.5	20.0	15.1
Fair value, fixed maturities	35,715.0		36,183.2
Residential mortgage-backed pass-through securities
Available-for-sale securities
Amortized cost, fixed maturities	2,760.5		2,420.6
Gross unrealized gains, fixed maturities	2.3		6.2
Gross unrealized losses, fixed maturities	192.7		198.1
Fair value, fixed maturities	2,570.1		2,228.7
Commercial mortgage-backed securities
Available-for-sale securities
Amortized cost, fixed maturities	5,491.1		5,572.2
Gross unrealized gains, fixed maturities			0.5
Gross unrealized losses, fixed maturities	715.1		708.1
Allowance, fixed maturities					0.3	0.3
Fair value, fixed maturities	4,776.0		4,864.6
Collateralized debt obligations
Available-for-sale securities
Amortized cost, fixed maturities	5,106.6		4,705.6
Gross unrealized gains, fixed maturities	16.0		4.5
Gross unrealized losses, fixed maturities	101.3		143.7
Fair value, fixed maturities	5,021.3		4,566.4
Other debt obligations
Available-for-sale securities
Amortized cost, fixed maturities	8,156.3		7,236.8
Gross unrealized gains, fixed maturities	6.4		5.7
Gross unrealized losses, fixed maturities	722.4		734.8
Allowance, fixed maturities	0.1	$ 0.1	0.1		$ 0.1	$ 0.1
Fair value, fixed maturities	$ 7,440.2		$ 6,507.6

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

+ Details

Name:	us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

+ Details

Name:	us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount excluding accrued interest, of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479130/326-30-45-1

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479130/326-30-45-1

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479130/326-30-45-1

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 310
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480833/946-310-45-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3)(a)(4))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_InterestReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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

Name:	us-gaap_MarketableSecuritiesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USTreasuryAndGovernmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_ForeignGovernmentDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_ResidentialMortgageBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CommercialMortgageBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CollateralizedDebtObligationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_OtherDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: