XML 61 R49.htm IDEA: XBRL DOCUMENT v3.24.2

Investments - Fixed Maturities (Details) - USD ($) $ in Millions		Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Available-for-sale securities
Amortized cost, fixed maturities		$ 71,897.8		$ 70,781.4
Gross unrealized gains, fixed maturities		546.3		773.6
Gross unrealized losses, fixed maturities		6,672.4		5,877.2
Allowance, fixed maturities		2.9	$ 2.8	4.7	$ 8.5	$ 4.1	$ 7.8
Fair value, fixed maturities	[1]	65,768.8		65,673.1
Accrued interest receivable		641.8		619.2
U.S. government and agencies
Available-for-sale securities
Amortized cost, fixed maturities		2,058.2		1,745.3
Gross unrealized gains, fixed maturities		6.5		19.3
Gross unrealized losses, fixed maturities		277.2		235.8
Fair value, fixed maturities		1,787.5		1,528.8
Non-U.S. governments
Available-for-sale securities
Amortized cost, fixed maturities		568.2		550.3
Gross unrealized gains, fixed maturities		14.1		17.3
Gross unrealized losses, fixed maturities		75.0		59.7
Fair value, fixed maturities		507.3		507.9
States and political subdivisions
Available-for-sale securities
Amortized cost, fixed maturities		7,346.2		7,566.4
Gross unrealized gains, fixed maturities		16.1		44.3
Gross unrealized losses, fixed maturities		1,067.0		933.9
Fair value, fixed maturities		6,295.3		6,676.8
Corporate debt securities
Available-for-sale securities
Amortized cost, fixed maturities		38,240.1		38,431.3
Gross unrealized gains, fixed maturities		404.2		578.5
Gross unrealized losses, fixed maturities		3,890.7		3,195.2
Allowance, fixed maturities		2.8	2.7	4.6	8.4	4.0	7.7
Fair value, fixed maturities		34,750.8		35,810.0
Residential mortgage-backed pass-through securities
Available-for-sale securities
Amortized cost, fixed maturities		3,531.5		3,199.7
Gross unrealized gains, fixed maturities		8.5		26.0
Gross unrealized losses, fixed maturities		210.5		164.6
Fair value, fixed maturities		3,329.5		3,061.1
Commercial mortgage-backed securities
Available-for-sale securities
Amortized cost, fixed maturities		5,402.3		5,428.6
Gross unrealized gains, fixed maturities		1.1		1.2
Gross unrealized losses, fixed maturities		519.3		654.3
Fair value, fixed maturities		4,884.1		4,775.5
Collateralized debt obligations
Available-for-sale securities
Amortized cost, fixed maturities		5,821.4		5,386.0
Gross unrealized gains, fixed maturities		60.9		44.9
Gross unrealized losses, fixed maturities		8.5		27.2
Fair value, fixed maturities		5,873.8		5,403.7
Other debt obligations
Available-for-sale securities
Amortized cost, fixed maturities		8,929.9		8,473.8
Gross unrealized gains, fixed maturities		34.9		42.1
Gross unrealized losses, fixed maturities		624.2		606.5
Allowance, fixed maturities		0.1	$ 0.1	0.1	$ 0.1	$ 0.1	$ 0.1
Fair value, fixed maturities		$ 8,340.5		$ 7,909.3
[1] See Note 3, Investments, for further details relating to the amortized cost of fixed maturities, available-for-sale.

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/1943274/2147477802/946-310-45-1

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: