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Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012
Commitments and Contingencies
Acquisition agreements contingency liability	$ 568.1	$ 568.1
Expected payments to settle contingent obligations		95.8
Net present value of expected payments to settle contingent obligations		65.7
Expected payments to settle contingent obligations in 2012		43.2
Recognized gain under past acquisition agreements	47.4	57.3
Recognized gain attributable to the controlling interest	34.6	39.6
Pantheon
Commitments and Contingencies
Co-investment commitments in partnership	73.0	73.0
Pantheon | Russell
Commitments and Contingencies
Reimbursable amount of investment commitments	$ 39.8	$ 39.8

X

- Definition

For contingent consideration arrangements recognized in connection with a business combination, this element represents the expected payment amounts during the period.

+ References

No definition available.

+ Details

Name:	amg_BusinessCombinationContingentConsiderationArrangementsExpectedPayments
Namespace Prefix:	amg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

For contingent consideration arrangements recognized in connection with a business combination, this element represents the expected payment amounts within the current fiscal period.

+ References

No definition available.

+ Details

Name:	amg_BusinessCombinationContingentConsiderationArrangementsExpectedPaymentsInFiscalYear
Namespace Prefix:	amg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the net present value of expected payments under contingent consideration arrangements recognized in connection with a business combination.

+ References

No definition available.

+ Details

Name:	amg_BusinessCombinationContingentConsiderationArrangementsExpectedPaymentsNetPresentValue
Namespace Prefix:	amg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

For contingent consideration arrangements recognized in connection with a business combination, this element represents the recognized gain during the period.

+ References

No definition available.

+ Details

Name:	amg_BusinessCombinationContingentConsiderationArrangementsRecognizedGain
Namespace Prefix:	amg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

For contingent consideration arrangements recognized in connection with a business combination, this element represents the recognized gain attributable to the controlling interest during the period.

+ References

No definition available.

+ Details

Name:	amg_BusinessCombinationContingentConsiderationArrangementsRecognizedGainAttributableToControllingInterest
Namespace Prefix:	amg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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

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

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

+ References

No definition available.

+ Details

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

X

- Definition

For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 68

-Subparagraph g

-Clause 3

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=6911361&loc=d3e6927-128479

+ Details

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