Prospectus: Risk/Return: Legal Entity Identifier Document Type Document Period End Date Registrant Name Central Index Key Amendment Flag Amendment Description Trading Symbol Document Creation Date Document Effective Date Prospectus Date Document [Axis] Prospectus Performance Measure [Axis] Before Taxes Return After Taxes on Distributions After Taxes on Distributions Return After Taxes on Distributions and Sale of Fund Shares After Taxes on Distributions and Sales Series [Axis] Series S000038425 [Member] BMO Low Volatility Equity Fund Member BMO Low Volatility Equity Fund Share Class [Axis] Share Classes C000142379 [Member] Class A Class A,BMO Low Volatility Equity Fund Member Class I,BMO Low Volatility Equity Fund Member C000118493 [Member] Class I Risk/Return [Heading] Objective [Heading] Objective, Primary [Text Block] Objective, Secondary [Text Block] Expense [Heading] Expense Narrative [Text Block] Shareholder Fees Caption [Text] Shareholder Fees [Table] Operating Expenses Caption [Text] Annual Fund Operating Expenses [Table] Expense Footnotes [Text Block] Expenses Range of Exchange Fees [Text Block] Expense Example [Heading] Expense Example by Year [Heading] Expense Example Narrative [Text Block] Expense Example by, Year, Caption [Text] Expense Example, With Redemption [Table] Expense Example, No Redemption Narrative [Text Block] Expense Example, No Redemption, By Year, Caption [Text] Expense Example, No Redemption [Table] Expense Example Footnotes [Text Block] Expense Example Closing [Text Block] Portfolio Turnover [Heading] Portfolio Turnover [Text Block] Strategy [Heading] Strategy Narrative [Text Block] Risk [Heading] Risk Narrative [Text Block] Risk Footnotes [Text Block] Risk Closing [Text Block] Bar Chart and Performance Table [Heading] Performance Narrative [Text Block] Bar Chart Narrative [Text Block] Bar Chart [Heading] Bar Chart [Table] Bar Chart Footnotes [Text Block] Bar Chart Closing [Text Block] Performance Table Heading Performance [Table] Performance Table Narrative Market Index Performance [Table] Performance Table Footnotes Performance Table Closing [Text Block] Shareholder Fees: Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) Maximum Sales Charge (Load) Imposed on Purchases Maximum Deferred Sales Charge (Load) (as a percentage of shares redeemed within 18 months of purchase) Maximum Deferred Sales Charge (as a percentage) Redemption Fee Redemption Fee (as a percentage of Amount Redeemed) Redemption Fee (as a percentage of amount redeemed, for shares held less than 30 days) Shareholder Fees Column [Text] Maximum Cumulative Sales Charge (as a percentage of Offering Price) Maximum Cumulative Sales Charge (as a percentage) Maximum Deferred Sales Charge (as a percentage of Offering Price) Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) Redemption Fee Redemption Fee Exchange Fee (as a percentage of Amount Redeemed) Exchange Fee Maximum Account Fee (as a percentage of Assets) Maximum Account Fee Shareholder Fee, Other Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement Net Expenses (as a percentage of Assets) Total Annual Fund Operating Expenses Expenses (as a percentage of Assets) Total Annual Fund Operating Expenses Management Fees (as a percentage of Assets) Management Fees Distribution (12b-1) Fees Distribution and Service (12b-1) Fees Distribution or Similar (Non 12b-1) Fees Other Expenses Other Expenses (as a percentage of Assets): Total Other Expenses Total Other Expenses Other Expenses Component1 Other Expenses Dividend and Interest Expenses Component2 Other Expenses Component3 Other Expenses Acquired Fund Fees and Expenses Acquired Fund Fees and Expenses Acquired (underlying) Fund Fees and Expenses Fee Waiver and Expense Reimbursement Fee Waiver or Reimbursement Operating Expenses: Operating Expenses Column [Text] Expense Example: 1 Year Expense Example, with Redemption, 1 Year 3 Years Expense Example, with Redemption, 3 Years 5 Years Expense Example, with Redemption, 5 Years 10 Years Expense Example, with Redemption, 10 Years Expense Example, By Year, Column [Text] Column Expense Example, No Redemption: 1 Year Expense Example, No Redemption, 1 Year 3 Years Expense Example, No Redemption, 3 Years 5 Years Expense Example, No Redemption, 5 Years 10 Years Expense Example, No Redemption, 10 Years Expense Example, No Redemption, By Year, Column [Text] Column Bar Chart Table: Caption Annual Return Caption [Text] Column Annual Return, Column [Text] Inception Date Annual Return, Inception Date Annual Return 1990 Annual Return 1991 Annual Return 1992 Annual Return 1993 Annual Return 1994 Annual Return 1995 Annual Return 1996 Annual Return 1997 Annual Return 1998 Annual Return 1999 Annual Return 2000 Annual Return 2001 Annual Return 2002 Annual Return 2003 Annual Return 2004 Annual Return 2005 2006 Annual Return 2006 2007 Annual Return 2007 Annual Return 2008 2008 2009 Annual Return 2009 Annual Return 2010 2010 Annual Return 2011 2011 2012 Annual Return 2012 Annual Return 2013 2013 2014 Annual Return 2014 2015 Annual Return 2015 Annual Return 2016 Annual Return 2017 Annual Return 2018 Annual Return 2019 Annual Return 2020 Russell 1000® Index (reflects no deduction for fees, expenses or taxes) Russell One Thousand Index Reflects No Deduction For Fees Expenses Or Taxes Member Russell One Thousand Index Reflects No Deduction For Fees Expenses Or Taxes Member Llcvfi Reflects Deduction Of Fees And No Deduction For Sales Charges Or Taxes Member Llcvfi Reflects Deduction Of Fees And No Deduction For Sales Charges Or Taxes Member LLCVFI (reflects deduction of fees and no deduction for sales charges or taxes) Average Annual Return: 1 Year 1 Year Since Inception Since Inception Inception Date Inception Date Label 5 Years 5 Years 10 Years 10 Years Risk/Return Detail [Table] Fee Waiver or Reimbursement over Assets, Date of Termination Portfolio Turnover, Rate Expenses Deferred Charges [Text Block] Expense Breakpoint Discounts [Text] Expense Breakpoint, Minimum Investment Required [Amount] Expense Exchange Traded Fund Commissions [Text] Expenses Represent Both Master and Feeder [Text] Expenses Explanation of Nonrecurring Account Fee [Text] Other Expenses, New Fund, Based on Estimates [Text] Acquired Fund Fees and Expenses, Based on Estimates [Text] Expenses Other Expenses Had Extraordinary Expenses Been Included [Text] Expenses Restated to Reflect Current [Text] Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] Strategy Portfolio Concentration [Text]