Investment Income Recognition EBP, Master Trust [Policy Text Block] Investments at fair value EBP, Investment, Fair Value Rollover EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Investment Contract Institution [Axis] Investment Contract Institution [Axis] Investment Contract Institution Maximum Maximum [Member] Forfeited Nonvested Account, Decrease from Administrative Expense EBP, Forfeited Nonvested Account, Decrease from Administrative Expense Legal Entity [Axis] Legal Entity [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] EBP, Description of Plan [Table] Employer Contributions [Table] EBP, Description of Plan [Table] Mutual funds Mutual Fund [Member] Document Information [Table] Entities [Table] EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Table] Note Receivable From Participant Account Basis Spread on Prime Rate EBP, Note Receivable From Participant Account Basis Spread on Prime Rate Spread on the current prime rate used to determine the interest rate charged on participant loans. Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage EBP, Fully Benefit-Responsive Investment Contract [Table] EBP, Fully Benefit-Responsive Investment Contract [Table] Total deductions EBP, Change in Net Asset Available for Benefit, Decrease Note Receivable from Participant, Account, Maximum Borrowing, Amount EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount Note Receivable from Participant, Account, Minimum Borrowing, Amount EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount Transamerica Premier Life Transamerica Premier Life [Member] Transamerica Premier Life Maximum percentage of assets covered by wrap contracts Maximum percentage of assets covered by wrap contracts Maximum percentage of the Blended Rate Income Fund's assets expected to be covered by wrap contracts. American General Life Ins. Co. American General Life Ins. Co. [Member] American General Life Ins. Co. EBP, Fully Benefit-Responsive Investment Contract [Abstract] EBP Vesting Percentage upon Plan Termination EBP Vesting Percentage upon Plan Termination EBP Employee Vesting Percentage upon Plan Termination State Street Bank & Trust Co. - Boston State Street Bank & Trust Co. - Boston [Member] State Street Bank & Trust Co. - Boston Employer Contribution Vesting Service Period EBP, Employer Contribution Vesting Service Period EBP, Employer Contribution Vesting Service Period Local 2150 Local 2150 [Member] Local 2150 Money market mutual fund Money Market Funds [Member] Plan Interest in Master Trust EBP, Nonconsolidated, Plan Interest in Master Trust [Member] Level 1 Fair Value, Inputs, Level 1 [Member] Reconciliation of Financial Statement to Form 5500 EBP, Reconciliation of Financial Statement to Form 5500 [Table Text Block] Guaranteed investment contracts held by master trust EBP, Fully Benefit-Responsive Investment Contract [Text Block] Metropolitan Life Ins. Co. Metropolitan Life Ins. Co. [Member] Metropolitan Life Ins. Co. Statistical Measurement [Axis] Statistical Measurement [Axis] Additions to net assets attributed to EBP, Change in Net Asset Available for Benefit, Increase [Abstract] EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Table] Payment of Benefits EBP, Payment to Participant [Policy Text Block] Transfers as a result of transferred employees EBP, Change in Net Asset Available for Benefit, Transfer to (from) Plan Unfunded Commitment EBP, Fair Value, Investment, NAV, Unfunded Commitment EBP, Master Trust [Line Items] EBP, Master Trust [Line Items] Amendment Flag Amendment Flag Participants EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution Basis of Accounting EBP, Basis of Accounting [Policy Text Block] Investment Contract Institution [Domain] Investment Contract Institution [Domain] Investment Contract Institution [Domain] EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Table] Total investments EBP, Investment, Plan Interest in Master Trust, Fair and Contract Value Massachusetts Mutual Massachusetts Mutual [Member] Massachusetts Mutual Number of Shares Held EBP, Investment, Number of Shares EBP, Description of Plan and Accounting Change [Abstract] Receivables EBP, Receivable [Abstract] Fair Value Measurements EBP, Investment, Fair Value and NAV [Table Text Block] Participant Contribution Automatic Annual Increase Deferral Rate Participant Contribution Automatic Annual Increase Deferral Rate Participant Contribution Automatic Annual Increase Deferral Rate Security Type [Domain] Security Type [Domain] Security Type Common Stock Common Stock [Member] Investments [Domain] Investments [Domain] EBP, Master Trust [Abstract] Plan Interest in Master Trust, at contract value EBP, Investment, Plan Interest in Master Trust, Contract Value Use of Estimates EBP, Use of Estimate [Policy Text Block] Schedule of Asset Held for Investment EBP, Schedule of Asset Held for Investment [Text Block] Cover [Abstract] Reconciliation of Change in Net Assets Available for Benefits [Abstract] EBP, Reconciliation to Form 5500, Change in Net Asset Available for Benefit, Increase (Decrease) from Deemed Distribution [Abstract] Employer EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash Prudential Ins. Co. of America Prudential Ins. Co. of America [Member] Prudential Ins. Co. of America EBP, Synthetic Investment Contract EBP, Synthetic Investment Contract [Member] Minimum Minimum [Member] Investments Sold Investments Sold Amount of selling price for investments sold by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Investment Type [Axis] Investment Type [Axis] Interest income from notes receivable from participants EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Total Contributions EBP, Change in Net Asset Available for Benefit, Increase from Contribution 1st match 1st match [Member] 1st match Interest and dividend income EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment Description of Plan Employer Contributions EBP, Description of Plan [Line Items] Cost of Investment Acquired Cost of Investment Acquired Cost of investment acquired by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Other income EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Other Investment Income (Loss) Description of Plan EBP, Description of Plan [Text Block] Employee Group [Domain] Employee Group [Domain] Employee Group EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Statement of Net Asset Available for Benefit [Table] Adjustment from contract value to fair value Less: Adjustment from contract value to fair value, beginning of period Add: Adjustment from contract value to fair value, end of period EBP, Reconciliation to Form 5500, Net Asset Available for Benefit, Contract Value to Current Value Adjustment EBP, Schedule of Asset Held for Investment [Line Items] EBP, Schedule of Asset Held for Investment [Line Items] Contributions EBP, Contribution [Policy Text Block] EBP, Nonconsolidated, Master Trust and Plan Interest in Master Trust [Domain] EBP, Nonconsolidated, Master Trust and Plan Interest in Master Trust [Domain] WEC common stock EBP, Employer, Common Stock [Member] Number of participant redemption restrictions Number of participant redemption restrictions Number of participant redemption restrictions on investments measured using the net asset value per share practical expedient. EBP, Schedule of Asset Held for Investment [Abstract] Reconciliations of Net Assets Available for Benefits [Abstract] EBP, Form 5500 Caption, Net Assets [Abstract] EBP, Accounting Policy [Table] EBP, Accounting Policy [Table] Total additions, net EBP, Change in Net Asset Available for Benefit, Increase Investment income EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] Administrative expenses EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Assets Held for Investment, Total EBP, Asset Held for Investment Short-term investment fund Short-term investment fund [Member] Short-term investment fund Investments at contract value EBP, Investment, Contract Value Employer Contribution Vesting Percentage EBP, Employer Contribution Vesting Percentage Percentage of employer contribution vested after a set period of time or specified age. Pacific Life Ins. Co. Pacific Life Ins. Co. [Member] Pacific Life Ins. Co. Document Information [Line Items] Document Information [Line Items] Blended Rate Income Fund, at contract value EBP, Blended Rate Income Fund [Member] EBP, Blended Rate Income Fund Net Assets Available for Benefits EBP, Change in Net Asset Available for Benefit, Increase (Decrease) [Abstract] Non-represented management employees Non-represented management employees [Member] Non-represented management employees Investment in Master Trust EBP, Master Trust [Text Block] Employer contribution, matching percentage of eligible compensation EBP, Employer Contribution, Participant Compensation Matched, Percentage Minimum crediting rate Minimum crediting rate Minimum crediting rate that is guaranteed by wrap contracts. Level 2 Fair Value, Inputs, Level 2 [Member] Number of units held EBP, Investment, Number of Units, Held in WEC Stock Fund Number of units held in investment fund Employee Group [Axis] Employee Group [Axis] Employee Group Net increase in net assets available for benefits per the Form 5500 EBP, Form 5500 Caption, Net Income (Loss) EBP, Fully Benefit-Responsive Investment Contract [Line Items] EBP, Fully Benefit-Responsive Investment Contract [Line Items] EBP, Tax Status [Table] EBP, Tax Status [Table] Net increase in net assets available for benefits before net transfers Net increase in net assets available for benefits before net transfers per the financial statements EBP, Change in Net Asset Available for Benefit, Increase (Decrease) Related Party and Party-in-Interest Transactions EBP, Related Party and Party-in-Interest Transactions [Text Block] Total Investments EBP, Investment, Fair and Contract Value Number of changes in valuation methodologies Number of changes in valuation methodologies Number of changes in valuation methodologies used to fair value investments. EBP, Related Party and Party-in-Interest Transactions [Abstract] EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] Total receivables EBP, Receivable Employer contributions receivable EBP, Employer Contribution, Receivable Net appreciation in the fair value of investments EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Unrealized Gain (Loss) on Investment Participant Contribution, Automatic, Deferral Rate EBP, Participant Contribution, Automatic, Deferral Rate Dividend Income on Investment EBP, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment Benefits paid to participants EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Plan interest in Master Trust, at fair value EBP, Investment, Plan Interest in Master Trust, Fair Value Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Note Receivable From Participant Maximum Borrowing Term EBP, Note Receivable From Participant Account Maximum Borrowing Term EBP, Note Receivable From Participant Account Maximum Borrowing Term Potential fund yield Potential fund yield Potential yield of the blended rate income fund if there are significant redemptions when the market value is below the contract value. EBP, Statement of Net Asset Available for Benefit [Abstract] EBP, Accounting Policy [Line Items] EBP, Accounting Policy [Line Items] EBP, Tax Status [Abstract] WEC common stock fund EBP, Employer, Common Stock Fund [Member] Nationwide Life Ins. Co. Nationwide Life Ins. Co. [Member] Nationwide Life Ins. Co. EBP, Reconciliation of Financial Statement to Form 5500 [Table] EBP, Reconciliation of Financial Statement to Form 5500 [Table] Investments in synthetic guaranteed investment contracts EBP, Fully Benefit-Responsive Investment Contract [Table Text Block] Employer Contributions EBP, Contribution [Table Text Block] Plan interest in Master Trust investment income EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Change in Plan Interest in Master Trust EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] Administrative Expenses EBP, Expense [Policy Text Block] Partial distribution withdrawals per plan year Partial distribution withdrawals per plan year Partial distribution withdrawals per plan year Reconciliation of Financial Statement to Form 5500 EBP, Reconciliation of Financial Statement to Form 5500 [Text Block] Participant Loans EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Investment Valuation and Fair Value Measurements of Assets EBP, Investment [Policy Text Block] EBP, Master Trust [Table] EBP, Master Trust [Table] Level 1, Level 2, and Level 3 Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Company Match [Axis] Company Match [Axis] Company Match Document Type Document Type EBP 001 EBP 001 [Member] EBP 001 Retirement Saving Plan Security Type [Axis] Security Type [Axis] Security Type Plan Termination EBP, Plan Termination [Text Block] Entity Central Index Key Entity Central Index Key Note Receivable from Participant, Maximum Number of Notes Outstanding EBP, Note Receivable from Participant, Maximum Number of Notes Outstanding EBP, Note Receivable from Participant, Maximum Number of Notes Outstanding Participant Loan, Interest Rate EBP, Asset Held for Investment, Participant Loan, Interest Rate EBP, Reconciliation of Financial Statement to Form 5500 [Abstract] Investments EBP, Investment, Fair and Contract Value [Abstract] Common collective trust funds Common Collective Trust [Member] EBP, Tax Status [Line Items] EBP, Tax Status [Line Items] Deductions from net assets attributed to EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Forfeited Nonvested Account, Decrease from Employer Contribution EBP, Forfeited Nonvested Account, Decrease from Employer Contribution Note receivables from participants EBP, Note Receivable from Participant Audits in progress Audits in progress Number of audits in progress for any tax period. 2nd match 2nd match [Member] 2nd match Master Trust EBP, Nonconsolidated, Master Trust [Member] Additional company savings plans with assets in the master trust Additional company savings plans with assets in the master trust Additional company savings plans with assets in the master trust Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Accounting Policies EBP, Summary of Accounting Policy [Text Block] Entity Registrant Name Entity Registrant Name Maximum account balance that will require an automatic distribution through a lump-sum Maximum account balance that will require an automatic distribution through a lump-sum Maximum account balance that will require an automatic distribution through a lump-sum Summary of Investments in Master Trust EBP, Master Trust [Table Text Block] Cost of services provided by the Company Cost of services provided by the Company Cost of administrative and accounting services provided by the Company. Yield based on interest rate credited to participants Yield based on interest rate credited to participants Yield based on interest rate credited to participants Subsequent Events EBP, Subsequent Event [Policy Text Block] Federal Tax Status EBP, Tax Status [Text Block] Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage Note Receivable From Participant Period of Time of Reduction of Outstanding Loans EBP, Note Receivable From Participant Period of Time of Reduction of Outstanding Loans Period of time for which outstanding loans will reduce the amount a participant can borrow. JP Morgan Chase & Co. JP Morgan Chase & Co. [Member] JP Morgan Chase & Co. EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitAbstract [Abstract] Employee Benefit Plan Change In Net Asset Available For Benefits Notes Receivable from Participants EBP, Note Receivable from Participant [Policy Text Block] Total investment income Net investment income EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment EBP, Nonconsolidated, Master Trust and Plan Interest in Master Trust [Axis] EBP, Nonconsolidated, Master Trust and Plan Interest in Master Trust [Axis] EBP, Related Party and Party-in-Interest Transactions [Line Items] EBP, Related Party and Party-in-Interest Transactions [Line Items] Level 3 Fair Value, Inputs, Level 3 [Member] Yield based on actual earnings Yield based on actual earnings Yield based on actual earnings Net assets available for benefits Net assets available for benefits, beginning of year Net assets available for benefits, end of year Net assets available for benefits EBP, Net Asset Available for Benefit Entity [Domain] Entity [Domain] Contributions EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Local 2006 Local 2006 [Member] Local 2006 Forfeited Nonvested Account EBP, Forfeited Nonvested Account Employer contribution, matching percentage EBP, Employer Contribution, Matching Percentage Net assets available for benefits per the Form 5500 EBP, Form 5500 Caption, Net Assets Investments Measured at Net Asset Value Per Share Fair Value Measured at Net Asset Value Per Share [Member] Company Match [Domain] Company Match [Domain] Company Match EBP, Statement of Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Line Items]