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Affiliate Equity - Schedule of Changes in Redeemable Non-Controlling Interests (Details) $ in Millions	6 Months Ended
	Jun. 30, 2015 USD ($)
Changes in redeemable non-controlling interests during the period
Balance, as of December 31, 2014	$ 645.5
Transactions in Redeemable non-controlling interests	(61.8)
Changes in redemption value	160.6
Balance, as of June 30, 2015	$ 744.3

X

- Definition

Increase (decrease) in redeemable non-controlling interests during the period as a result of a change in the redemption value.

+ References

No definition available.

+ Details

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

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- Definition

The cash outflow during the period for redemption of redeemable noncontrolling interests.

+ References

No definition available.

+ Details

Name:	us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 480



-SubTopic 10



-Section S99



-Paragraph 3A



-Subparagraph (12)(c)



-URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764



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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 480



-SubTopic 10



-Section S99



-Paragraph 3A



-Subparagraph (16)(c)



-URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764



Reference 3: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 480



-SubTopic 10



-Section S99



-Paragraph 3A



-Subparagraph 15



-URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764



Reference 4: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 480



-SubTopic 10



-Section S99



-Paragraph 3A



-Subparagraph 14



-URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764

+ Details

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