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v3.26.1

Outstanding Exposure - Debt Service Outstanding (Details) - USD ($) $ in Billions | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Debt Service |  |
Gross | $ 442.1 | $ 441.4
Net | 441.5 | 440.8
Par Outstanding |  |
Gross | 279.2 | 277.6
Net | 278.6 | 277.1
Public finance |  |
Debt Service |  |
Gross | 428.0 | 428.5
Net | 427.9 | 428.4
Par Outstanding |  |
Gross | 265.9 | 265.6
Net | 265.9 | 265.6
Structured finance |  |
Debt Service |  |
Gross | 14.1 | 12.9
Net | 13.6 | 12.4
Par Outstanding |  |
Gross | 13.3 | 12.0
Net | $ 12.7 | $ 11.5

X
- Definition Debt Service + References No definition available. + Details
Name: | ago_DebtServiceAbstract
Namespace Prefix: | ago_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amount of insured contractual payments (principal and interest) outstanding on the underlying insured obligations for direct financial guaranty contracts. + References No definition available. + Details
Name: | ago_InsuredFinancialObligationsInsuredContractualPaymentsOutstandingGross
Namespace Prefix: | ago_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the amount of insured contractual payments (principal and interest) outstanding on the underlying insured obligations for financial guaranty contracts, net of ceded contracts. + References No definition available. + Details
Name: | ago_InsuredFinancialObligationsInsuredContractualPaymentsOutstandingNet
Namespace Prefix: | ago_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the outstanding principal amounts of the underlying insured obligations for financial guaranty contracts, gross of ceded contracts. + References No definition available. + Details
Name: | ago_InsuredFinancialObligationsOutstandingPrincipalAmountGross
Namespace Prefix: | ago_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the outstanding principal amounts of the underlying insured obligations for financial guaranty contracts, after netting out ceded contracts. + References No definition available. + Details
Name: | ago_InsuredFinancialObligationsOutstandingPrincipalAmountNet
Namespace Prefix: | ago_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Par Outstanding + References No definition available. + Details
Name: | ago_ParOutstandingAbstract
Namespace Prefix: | ago_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=ago_PublicFinanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=us-gaap_StructuredFinanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |