XML 73 R59.htm IDEA: XBRL DOCUMENT v3.24.2.u1

Commitments and Contingencies - Additional Information (Details) $ in Millions	Jun. 30, 2024 USD ($)
Commitments and Contingencies
Co-investment commitments in partnership	$ 217.5
Deferred payment obligation	43.3
Equity Method Investee
Commitments and Contingencies
Deferred payment obligation	63.1
Payments for Achievement of Financial Targets
Commitments and Contingencies
Total contingent payments	240.7
Contingent payments in remainder of fiscal year	4.0
Other commitment, payable from 2025 through 2028	236.7
Payment contingent on not meeting financial targets	12.5
Payment contingent on exercise of option to reduce ownership percentage	25.0
Payments For Contingent Financing
Commitments and Contingencies
Total contingent payments	$ 50.0

X

- Definition

-- None. No documentation exists for this element. --

+ References

No definition available.

+ Details

Name:	amg_CommitmentAndContingenciesLineItems
Namespace Prefix:	amg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Deferred Payment Obligations, Liability

+ References

No definition available.

+ Details

Name:	amg_DeferredPaymentObligationsLiability
Namespace Prefix:	amg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount that the entity agreed to co-invest in certain investment partnerships where the entity serves as the general partner.

+ References

No definition available.

+ Details

Name:	amg_InvestmentCommitmentAmount
Namespace Prefix:	amg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Other Commitment, Contingent Consideration, Asset

+ References

No definition available.

+ Details

Name:	amg_OtherCommitmentContingentConsiderationAsset
Namespace Prefix:	amg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Other Commitment, Contingent Consideration, Option To Reduce Ownership Interest, Asset

+ References

No definition available.

+ Details

Name:	amg_OtherCommitmentContingentConsiderationOptionToReduceOwnershipInterestAsset
Namespace Prefix:	amg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Other Commitment, Payable in Year Two Through Five

+ References

No definition available.

+ Details

Name:	amg_OtherCommitmentPayableInYearTwoThroughFive
Namespace Prefix:	amg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

+ References

No definition available.

+ Details

Name:	us-gaap_OtherCommitment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of commitment classified as other to be paid in remainder of current fiscal year.

+ References

No definition available.

+ Details

Name:	us-gaap_OtherCommitmentsFutureMinimumPaymentsRemainderOfFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_EquityMethodInvesteeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_OtherCommitmentsAxis=amg_PaymentsForAchievementOfFinancialTargetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_OtherCommitmentsAxis=amg_PaymentsForContingentFinancingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: