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Commitments and Contingencies (Details)	Jun. 30, 2016 USD ($)
Commitments and Contingencies
Co-investment commitments in partnership	$ 87,500,000
Expected payments of contingent liability	10,300,000
Prior Owner
Commitments and Contingencies
Reimbursable amount of investment commitments	15,300,000
Consolidated Affiliates
Commitments and Contingencies
Contingent liability	84,900,000
Expected payments of contingent liability	84,900,000
Equity Method Investee
Commitments and Contingencies
Contingent liability	316,500,000
Expected payments of contingent liability	$ 0

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- Definition

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No definition available.

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

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- Definition

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

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No definition available.

+ Details

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

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- Definition

Other Commitment Expected Payments

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No definition available.

+ Details

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

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- Definition

Represents the contractual obligation to reimburse the entity for co-investments in investment partnerships.

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No definition available.

+ Details

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Namespace Prefix:	amg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- 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

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

X

- Details

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Namespace Prefix:
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- Details

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