XML 67 R54.htm IDEA: XBRL DOCUMENT
v3.24.2.u1

Expected Loss to be Paid (Recovered) - Key Assumptions in Base Scenario Expected Loss First Lien RMBS (Details) - RMBS - United States | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Expected Losses to be Paid [Line Items] |  |
Loss severity on future defaults | 50.00% | 50.00%
Home Equity Line of Credit |  |
Schedule of Expected Losses to be Paid [Line Items] |  |
Loss severity on future defaults | 98.00% | 98.00%
Projected future recoveries on previously charged-off loans | 40.00% | 40.00%
Current but recently delinquent | Home Equity Line of Credit |  |
Schedule of Expected Losses to be Paid [Line Items] |  |
Liquidation rate | 20.00% | 20.00%
30 – 59 Days Delinquent | Home Equity Line of Credit |  |
Schedule of Expected Losses to be Paid [Line Items] |  |
Liquidation rate | 30.00% | 30.00%
60 – 89 Days Delinquent | Home Equity Line of Credit |  |
Schedule of Expected Losses to be Paid [Line Items] |  |
Liquidation rate | 40.00% | 40.00%
90+ Days Delinquent | Home Equity Line of Credit |  |
Schedule of Expected Losses to be Paid [Line Items] |  |
Liquidation rate | 60.00% | 60.00%
Bankruptcy | Home Equity Line of Credit |  |
Schedule of Expected Losses to be Paid [Line Items] |  |
Liquidation rate | 55.00% | 55.00%
Foreclosure | Home Equity Line of Credit |  |
Schedule of Expected Losses to be Paid [Line Items] |  |
Liquidation rate | 55.00% | 55.00%
Real Estate Owned | Home Equity Line of Credit |  |
Schedule of Expected Losses to be Paid [Line Items] |  |
Liquidation rate | 100.00% | 100.00%
Minimum |  |
Schedule of Expected Losses to be Paid [Line Items] |  |
Plateau CDR | 0.00% | 0.00%
Final CDR | 0.00% | 0.00%
Minimum | Home Equity Line of Credit |  |
Schedule of Expected Losses to be Paid [Line Items] |  |
Plateau CDR | 0.00% | 0.00%
Final CDR | 0.00% | 0.00%
Maximum |  |
Schedule of Expected Losses to be Paid [Line Items] |  |
Plateau CDR | 12.80% | 10.00%
Final CDR | 0.60% | 0.50%
Maximum | Home Equity Line of Credit |  |
Schedule of Expected Losses to be Paid [Line Items] |  |
Plateau CDR | 8.20% | 9.30%
Final CDR | 0.40% | 0.50%
Weighted Average |  |
Schedule of Expected Losses to be Paid [Line Items] |  |
Plateau CDR | 3.90% | 4.20%
Final CDR | 0.20% | 0.20%
Weighted Average | Home Equity Line of Credit |  |
Schedule of Expected Losses to be Paid [Line Items] |  |
Plateau CDR | 2.30% | 2.60%
Final CDR | 0.10% | 0.10%

X
- Definition Insured Financial Obligations, Projected Loss Assumptions, Conditional Default Rate, Final Rate + References No definition available. + Details
Name: | ago_InsuredFinancialObligationsProjectedLossAssumptionsConditionalDefaultRateFinalRate
Namespace Prefix: | ago_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Insured Financial Obligations, Projected Loss Assumptions, Conditional Default Rate, Plateau + References No definition available. + Details
Name: | ago_InsuredFinancialObligationsProjectedLossAssumptionsConditionalDefaultRatePlateau
Namespace Prefix: | ago_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Insured Financial Obligations, Projected Loss Assumptions, Liquidation Rate + References No definition available. + Details
Name: | ago_InsuredFinancialObligationsProjectedLossAssumptionsLiquidationRate
Namespace Prefix: | ago_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Insured Financial Obligations, Projected Loss Assumptions, Loss Severity, Initial Rate + References No definition available. + Details
Name: | ago_InsuredFinancialObligationsProjectedLossAssumptionsLossSeverityInitialRate
Namespace Prefix: | ago_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Loss Recovery Assumption of Charged-Off Loans, Estimated Future Recoveries, Percent + References No definition available. + Details
Name: | ago_LossRecoveryAssumptionofChargedOffLoansEstimatedFutureRecoveriesPercent
Namespace Prefix: | ago_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition [Line Items] for Schedule of Expected Losses to be Paid [Table] + References No definition available. + Details
Name: | ago_ScheduleofExpectedLossestobePaidLineItems
Namespace Prefix: | ago_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | srt_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_HomeEquityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ago_FinancingReceivablePeriodPastDueAxis=ago_FinancingReceivableDelinquentModifiedinPrevious12MonthsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ago_FinancingReceivablePeriodPastDueAxis=us-gaap_FinancingReceivables30To59DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ago_FinancingReceivablePeriodPastDueAxis=us-gaap_FinancingReceivables60To89DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ago_FinancingReceivablePeriodPastDueAxis=us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ago_FinancingReceivablePeriodPastDueAxis=ago_FinancingReceivablesBankruptcyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ago_FinancingReceivablePeriodPastDueAxis=ago_FinancingReceivableForeclosureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ago_FinancingReceivablePeriodPastDueAxis=ago_FinancingReceivableRealEstateOwnedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_WeightedAverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |