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Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles - Number of Consolidated CIVs by Type (Details) - Variable Interest Entity, Primary Beneficiary - Consolidated Investment Vehicles | 3 Months Ended | 12 Months Ended
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Mar. 31, 2022 cLOWarehouse consolidatedInvestmentVehicle consolidatedCLO consolidatedInvestmentFund | Dec. 31, 2021 consolidatedInvestmentFund consolidatedInvestmentVehicle cLOWarehouse consolidatedCLO
Variable Interest Entity [Line Items] |  |
Funds | consolidatedInvestmentFund | 8 | 8
CLOs | consolidatedCLO | 9 | 9
CLO warehouses | cLOWarehouse | 3 | 3
Total number of consolidated CIVs | consolidatedInvestmentVehicle | 20 | 20

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- Definition Number of Collateralized Loan Obligation Warehouses + References No definition available. + Details
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Namespace Prefix: | ago_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of Consolidated Investment Vehicles + References No definition available. + Details
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Namespace Prefix: | ago_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of Consolidated Investment Managed Collateralized Loan Obligations + References No definition available. + Details
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Namespace Prefix: | ago_
Data Type: | xbrli:integerItemType
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- Definition Number of Consolidated Investment Managed Funds + References No definition available. + Details
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Namespace Prefix: | ago_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- 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
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |