XML 167 R145.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Shareholders' Equity - Share Issuance (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) votePerShare $ / shares shares | Dec. 31, 2022 $ / shares shares
Equity [Abstract] |  |
Authorized share capital | $ | $ 5,000,000 |
Common stock, shares authorized (in shares) | shares | 500,000,000 | 500,000,000
Common stock par value (in dollars per share) | $ / shares | $ 0.01 | $ 0.01
Number of votes per share of common stock | votePerShare | 1 |
Percentage of controlled shares | 9.50% |
Percentage of voting power held by one shareholder | 75.00% |

X
- Definition The maximum value of common shares permitted to be issued by an entity's charter and bylaws. + References No definition available. + Details
Name: | ago_CommonStockSharesAuthorizedValue
Namespace Prefix: | ago_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Common Stock, Voting Rights, Number of Votes per Share + References No definition available. + Details
Name: | ago_CommonStockVotingRightsNumberofVotesperShare
Namespace Prefix: | ago_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of Controlled Shares, as Determined Pursuant to Section 958 + References No definition available. + Details
Name: | ago_PercentageofControlledSharesasDeterminedPursuanttoSection958
Namespace Prefix: | ago_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of Voting Power Held by One Shareholder + References No definition available. + Details
Name: | ago_PercentageofVotingPowerHeldbyOneShareholder
Namespace Prefix: | ago_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Face amount or stated value per share of common stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_CommonStockParOrStatedValuePerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(16)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479617/946-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_CommonStockSharesAuthorized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration