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Equity Distribution Program (Details) $ in Millions	Mar. 31, 2025 USD ($)
Forward Equity Sale Agreements [Abstract]
Equity distribution program, maximum amount authorized	$ 500.0

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- Definition

Stock Issuable, Value, Maximum

+ References

No definition available.

+ Details

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