S000009876 [Member] Investment Objectives and Goals - AMG TimesSquare Mid Cap Growth Fund |
Dec. 31, 2025 |
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| Prospectus [Line Items] | |
| Risk/Return [Heading] | AMG TimesSquare Mid Cap Growth Fund |
| Objective [Heading] | Investment Objective |
| Objective, Primary [Text Block] | The investment objective of the AMG TimesSquare Mid Cap Growth Fund (the “Fund” ) is to achieve long-term capital appreciation.
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