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Medical Claims and Related Payables - Narrative (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Insurance [Abstract] |  |
Related payables associated with retained liability | $ 28.5 | $ 13.3

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- Definition Liability For Claims And Claims Adjustment Expense, Amounts Recoverable under risk sharing arrangements + References No definition available. + Details
Name: | agl_LiabilityForClaimsAndClaimsAdjustmentExpenseAmountsRecoverable
Namespace Prefix: | agl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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