S000009876 [Member] Annual Fund Operating Expenses - AMG TimesSquare Mid Cap Growth Fund |
Dec. 31, 2025 |
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|---|---|---|---|---|
| Class Z | ||||
| Prospectus [Line Items] | ||||
| Management Fees (as a percentage of Assets) | 0.66% | |||
| Distribution and Service (12b-1) Fees | 0.00% | |||
| Other Expenses (as a percentage of Assets): | 0.20% | [1] | ||
| Expenses (as a percentage of Assets) | 0.86% | |||
| Class N | ||||
| Prospectus [Line Items] | ||||
| Management Fees (as a percentage of Assets) | 0.66% | |||
| Distribution and Service (12b-1) Fees | 0.00% | |||
| Other Expenses (as a percentage of Assets): | 0.40% | [1] | ||
| Expenses (as a percentage of Assets) | 1.06% | |||
| Class I | ||||
| Prospectus [Line Items] | ||||
| Management Fees (as a percentage of Assets) | 0.66% | |||
| Distribution and Service (12b-1) Fees | 0.00% | |||
| Other Expenses (as a percentage of Assets): | 0.25% | [1] | ||
| Expenses (as a percentage of Assets) | 0.91% | |||
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