Touchstone Small Company Fund Investment Strategy - Touchstone Small Company Fund	Dec. 31, 2025
Prospectus [Line Items]
Strategy [Heading]	<span style="color:#000000;font-family:Arial Narrow;font-size:12pt;font-weight:bold;text-decoration:underline;">The Fund’s Principal Investment Strategies</span>
Strategy Narrative [Text Block]	The Fund normally invests at least 80% of its assets in small-capitalization companies. This is a non-fundamental investment policy that can be changed by the Fund upon 60 days’ prior written notice to shareholders. For this purpose, small capitalization companies are companies that have market capitalizations within the range represented in the Russell 2000® Index (between approximately $4 million and $38.2 billion as of March 31, 2026). The market cap range of the Russell 2000® Index will change with market conditions. For these purposes, an issuer’s market cap is determined at the time of purchase. The Fund seeks to invest primarily in common stocks of small companies that Fort Washington Investment Advisors, Inc., the Fund’s sub-adviser, believes are high quality, have superior business models, solid management teams, sustainable growth potential and are attractively valued. The Fund may invest without limitation in foreign securities, although only where the securities are trading in the U.S. or Canada and only where trading is denominated in U.S. or Canadian dollars. Up to 25% of the Fund’s assets may be invested in securities within a single industry. Although the Fund may invest in any economic sector, at times it may emphasize one or more particular sectors. At times the Fund may have less than 80% of its investments in companies within the market cap range of the Russell 2000® Index due to market appreciation. The Fund typically sells a security if the portfolio manager believes it is overvalued, if the original investment premise is no longer true, if the holding size exceeds the portfolio manager’s company or sector weighting guidelines and/or to take advantage of a more attractive investment opportunity. The Fund may also sell a partial position in a security in order to manage the size of the position. A security may also be sold to meet redemptions.

Touchstone Small Company Fund Investment Strategy - Touchstone Small Company Fund

Dec. 31, 2025

<span style="color:#000000;font-family:Arial Narrow;font-size:12pt;font-weight:bold;text-decoration:underline;">The Fund’s Principal Investment Strategies</span>

Strategy Narrative [Text Block]

The Fund normally invests at least 80% of its assets in small-capitalization companies. This is a non-fundamental investment policy that can be changed by the Fund upon 60 days’ prior written notice to shareholders. For this purpose, small capitalization companies are companies that have market capitalizations within the range represented in the Russell 2000® Index (between approximately $4 million and $38.2 billion as of March 31, 2026). The market cap range of the Russell 2000® Index will change with market conditions. For these purposes, an issuer’s market cap is determined at the time of purchase. The Fund seeks to invest primarily in common stocks of small companies that Fort Washington Investment Advisors, Inc., the Fund’s sub-adviser, believes are high quality, have superior business models, solid management teams, sustainable growth potential and are attractively valued. The Fund may invest without limitation in foreign securities, although only where the securities are trading in the U.S. or Canada and only where trading is denominated in U.S. or Canadian dollars. Up to 25% of the Fund’s assets may be invested in securities within a single industry. Although the Fund may invest in any economic sector, at times it may emphasize one or more particular sectors. At times the Fund may have less than 80% of its investments in companies within the market cap range of the Russell 2000® Index due to market appreciation. The Fund typically sells a security if the portfolio manager believes it is overvalued, if the original investment premise is no longer true, if the holding size exceeds the portfolio manager’s company or sector weighting guidelines and/or to take advantage of a more attractive investment opportunity. The Fund may also sell a partial position in a security in order to manage the size of the position. A security may also be sold to meet redemptions.