XML 171 R120.htm IDEA: XBRL DOCUMENT v3.24.3

Reserves for Losses and Adjustment Expenses Short-duration Contracts - Historical Claims Duration (Details)	Dec. 31, 2023
Property Insurance
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year One	30.60%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Two	39.00%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Three	13.70%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Four	6.30%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Five	2.70%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Six	2.40%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Seven	(0.20%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Eight	(0.30%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Nine	(0.70%)
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Ten	0.00%
Casualty Insurance
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year One	4.10%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Two	18.70%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Three	33.10%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Four	24.20%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Five	2.70%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Six	1.00%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Seven	(5.10%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Eight	(0.40%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Nine	(0.10%)
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Ten	0.00%
Marine, Aviation and Energy Insurance
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year One	22.50%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Two	33.30%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Three	21.50%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Four	11.40%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Five	3.20%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Six	3.10%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Seven	(2.80%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Eight	(0.70%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Nine	(0.40%)
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Ten	0.00%
Financial and Professional Insurance
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year One	12.10%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Two	28.60%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Three	20.70%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Four	16.00%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Five	5.30%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Six	6.00%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Seven	(4.70%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Eight	(1.40%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Nine	(0.30%)
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Ten	0.00%
Property Catastrophe and Other Property Reinsurance
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year One	22.60%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Two	45.50%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Three	16.70%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Four	5.80%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Five	2.30%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Six	1.50%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Seven	(0.20%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Eight	(0.70%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Nine	(0.10%)
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Ten	0.00%
Casualty Reinsurance
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year One	6.00%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Two	19.00%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Three	22.40%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Four	19.30%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Five	12.50%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Six	8.10%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Seven	(5.20%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Eight	(1.70%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Nine	0.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Ten	0.00%
Specialty Reinsurance
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year One	27.30%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Two	34.90%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Three	14.30%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Four	7.40%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Five	3.70%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Six	1.10%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Seven	(0.50%)
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Eight	0.00%
Average Annual Percentage Payout of Incurred Claims, Net of Reinsurance, Year Nine	0.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Ten	0.00%

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

X

- Definition

Percentage of average annual payout, after reinsurance, in the eighth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 4G
-SubTopic 40
-Topic 944
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480081/944-40-50-4G

+ Details

Name:	us-gaap_ShortdurationInsuranceContractsHistoricalClaimsDurationYearEight
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of average annual payout, after reinsurance, in the fifth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 4G
-SubTopic 40
-Topic 944
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480081/944-40-50-4G

+ Details

Name:	us-gaap_ShortdurationInsuranceContractsHistoricalClaimsDurationYearFive
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of average annual payout, after reinsurance, in the fourth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 4G
-SubTopic 40
-Topic 944
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480081/944-40-50-4G

+ Details

Name:	us-gaap_ShortdurationInsuranceContractsHistoricalClaimsDurationYearFour
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of average annual payout, after reinsurance, in the ninth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 4G
-SubTopic 40
-Topic 944
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480081/944-40-50-4G

+ Details

Name:	us-gaap_ShortdurationInsuranceContractsHistoricalClaimsDurationYearNine
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of average annual payout, after reinsurance, in the first year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 4G
-SubTopic 40
-Topic 944
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480081/944-40-50-4G

+ Details

Name:	us-gaap_ShortdurationInsuranceContractsHistoricalClaimsDurationYearOne
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of average annual payout, after reinsurance, in the seventh year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 4G
-SubTopic 40
-Topic 944
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480081/944-40-50-4G

+ Details

Name:	us-gaap_ShortdurationInsuranceContractsHistoricalClaimsDurationYearSeven
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of average annual payout, after reinsurance, in the sixth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 4G
-SubTopic 40
-Topic 944
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480081/944-40-50-4G

+ Details

Name:	us-gaap_ShortdurationInsuranceContractsHistoricalClaimsDurationYearSix
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of average annual payout, after reinsurance, in the tenth year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 4G
-SubTopic 40
-Topic 944
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480081/944-40-50-4G

+ Details

Name:	us-gaap_ShortdurationInsuranceContractsHistoricalClaimsDurationYearTen
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of average annual payout, after reinsurance, in the third year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 4G
-SubTopic 40
-Topic 944
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480081/944-40-50-4G

+ Details

Name:	us-gaap_ShortdurationInsuranceContractsHistoricalClaimsDurationYearThree
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of average annual payout, after reinsurance, in the second year after a claim is incurred, beginning with the earliest accident year disclosed for short-duration insurance contracts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 4G
-SubTopic 40
-Topic 944
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480081/944-40-50-4G

+ Details

Name:	us-gaap_ShortdurationInsuranceContractsHistoricalClaimsDurationYearTwo
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	srt_ProductOrServiceAxis=us-gaap_PropertyInsuranceProductLineMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=ahl_CasualtyCommercialInsuranceProductLineMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=ahl_MarineAviationandEnergyCommercialInsuranceProductLineMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=ahl_FinancialandProfessionalCommercialInsuranceProductLineMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=ahl_AssumedPropertyCatastropheandOtherPropertyCommercialInsuranceProductLineMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=ahl_AssumedCasualtyCommercialInsuranceProductLineMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=ahl_AssumedSpecialtyCommercialInsuranceProductLineMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: