XML 96 R80.htm IDEA: XBRL DOCUMENT v3.3.1.900

Fixed Assets and Lease Commitments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fixed Assets and Lease Commitments [Abstract]
Consolidated rent expense	$ 36.3	$ 30.5	$ 30.3

X

- Definition

Fixed Assets and Lease Commitments [Abstract]

+ References

No definition available.

+ Details

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

X

- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717

+ Details

Name:	us-gaap_OperatingLeasesRentExpenseNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration