$WEC
WEC ENERGY GROUP, INC. Stock $wec

$wec Overview Financials Valuation SEC Filings Company Website

2019 Q4 Form 10-K Financial Statement

#000010781520000089 Filed on February 27, 2020

Income Statement

Concept	2019 Q4	2018 Q4	2018 Q3
Revenue	$1.948B	$2.077B	$1.644B
YoY Change	-6.23%	1.06%	-0.83%
Cost Of Revenue	$652.5M	$887.2M	$524.1M
YoY Change	-26.45%	11.29%	-3.43%
Gross Profit	$1.295B	$1.190B	$1.120B
YoY Change	8.86%	-5.42%	0.43%
Gross Profit Margin	66.5%	57.28%	68.11%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$236.2M	$217.7M	$212.8M
YoY Change	8.5%	6.14%	5.77%
% of Gross Profit	18.24%	18.3%	19.01%
Operating Expenses	$891.4M	$933.0M	$816.9M
YoY Change	-4.46%	9.15%	13.05%
Operating Profit	$363.1M	$289.8M	$302.7M
YoY Change	25.29%	-28.8%	-22.82%
Interest Expense	-$130.6M	-$43.20M	$112.0M
YoY Change	202.31%	-41.54%	7.9%
% of Operating Profit	-35.97%	-14.91%	37.0%
Other Income/Expense, Net	$4.700M	$5.300M	-$52.20M
YoY Change	-11.32%	-81.4%	11.54%
Pretax Income	$277.7M	$218.7M	$250.5M
YoY Change	26.98%	-38.84%	-27.48%
Income Tax	$33.50M	$13.40M	$17.00M
% Of Pretax Income	12.06%	6.13%	6.79%
Net Earnings	$243.9M	$205.0M	$233.2M
YoY Change	18.98%	-52.61%	8.26%
Net Earnings / Revenue	12.52%	9.87%	14.19%
Basic Earnings Per Share	$0.77	$0.65	$0.74
Diluted Earnings Per Share	$0.77	$0.65	$0.74
COMMON SHARES
Basic Shares Outstanding			315.5M shares
Diluted Shares Outstanding			316.9M shares

Balance Sheet

Concept	2019 Q4	2018 Q4	2018 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$38.00M	$85.00M	$15.00M
YoY Change	-55.29%	117.95%	-16.67%
Cash & Equivalents	$37.50M	$84.50M	$14.50M
Short-Term Investments
Other Short-Term Assets	$68.00M	$77.20M	$61.80M
YoY Change	-11.92%	3.07%	43.72%
Inventory	$550.0M	$548.0M	$609.0M
Prepaid Expenses	$261.8M	$256.8M	$137.6M
Receivables	$1.177B	$1.281B	$1.017B
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$2.094B	$2.248B	$1.840B
YoY Change	-6.85%	1.54%	0.9%
LONG-TERM ASSETS
Property, Plant & Equipment	$23.62B	$22.00B	$21.66B
YoY Change	7.36%	3.06%	3.74%
Goodwill	$3.053B	$3.053B	$3.053B
YoY Change	0.0%	-0.02%	-0.02%
Intangibles
YoY Change
Long-Term Investments	$1.721B	$1.665B	$1.614B
YoY Change	3.33%	7.2%	3.39%
Other Assets	$957.8M	$704.1M	$749.0M
YoY Change	36.03%	13.58%	28.08%
Total Long-Term Assets	$32.86B	$31.23B	$30.72B
YoY Change	5.22%	6.3%	5.25%
TOTAL ASSETS
Total Short-Term Assets	$2.094B	$2.248B	$1.840B
Total Long-Term Assets	$32.86B	$31.23B	$30.72B
Total Assets	$34.95B	$33.48B	$32.56B
YoY Change	4.41%	5.97%	5.0%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$908.1M	$876.4M	$690.4M
YoY Change	3.62%	1.92%	-7.19%
Accrued Expenses	$204.0M	$185.0M	$361.0M
YoY Change	10.27%	9.47%	163.5%
Deferred Revenue
YoY Change
Short-Term Debt	$830.8M	$1.440B	$1.788B
YoY Change	-42.31%	-0.32%	79.88%
Long-Term Debt Due	$686.9M	$360.1M	$369.0M
YoY Change	90.75%	-57.23%	-47.95%
Total Short-Term Liabilities	$3.183B	$3.332B	$3.603B
YoY Change	-4.47%	-13.89%	19.05%
LONG-TERM LIABILITIES
Long-Term Debt	$11.17B	$9.976B	$9.119B
YoY Change	11.99%	14.05%	3.79%
Other Long-Term Liabilities	$1.129B	$1.108B	$1.233B
YoY Change	1.88%	-8.14%	3.27%
Total Long-Term Liabilities	$21.51B	$20.30B	$19.12B
YoY Change	5.98%	11.37%	1.9%
TOTAL LIABILITIES
Total Short-Term Liabilities	$3.183B	$3.332B	$3.603B
Total Long-Term Liabilities	$21.51B	$20.30B	$19.12B
Total Liabilities	$24.70B	$23.63B	$22.72B
YoY Change	4.5%	6.94%	4.28%
SHAREHOLDERS EQUITY
Retained Earnings	$5.928B	$5.538B	$5.508B
YoY Change	7.03%	6.98%	12.22%
Common Stock	$4.190B	$4.253B	$3.200M
YoY Change	-1.49%	-0.66%	0.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$10.14B	$9.819B	$9.806B
YoY Change
Total Liabilities & Shareholders Equity	$34.95B	$33.48B	$32.56B
YoY Change	4.41%	5.97%	5.0%

Cashflow Statement

Concept	2019 Q4	2018 Q4	2018 Q3
OPERATING ACTIVITIES
Net Income	$243.9M	$205.0M	$233.2M
YoY Change	18.98%	-52.61%	8.26%
Depreciation, Depletion And Amortization	$236.2M	$217.7M	$212.8M
YoY Change	8.5%	6.14%	5.77%
Cash From Operating Activities	$504.8M	$437.3M	$494.8M
YoY Change	15.44%	31.36%	3.34%
INVESTING ACTIVITIES
Capital Expenditures	$749.3M	$625.2M	$575.0M
YoY Change	19.85%	-3.86%	10.75%
Acquisitions
YoY Change
Other Investing Activities	-$11.10M	-$39.20M	-$148.2M
YoY Change	-71.68%	3.16%	1325.0%
Cash From Investing Activities	-$760.4M	-$664.4M	-$723.2M
YoY Change	14.45%	-3.47%	36.56%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	271.3M	333.0M	216.6M
YoY Change	-18.53%	-11.32%	598.71%
NET CHANGE
Cash From Operating Activities	504.8M	437.3M	494.8M
Cash From Investing Activities	-760.4M	-664.4M	-723.2M
Cash From Financing Activities	271.3M	333.0M	216.6M
Net Change In Cash	15.70M	105.9M	-11.80M
YoY Change	-85.17%	426.87%	-40.4%
FREE CASH FLOW
Cash From Operating Activities	$504.8M	$437.3M	$494.8M
Capital Expenditures	$749.3M	$625.2M	$575.0M
Free Cash Flow	-$244.5M	-$187.9M	-$80.20M
YoY Change	30.12%	-40.8%	98.51%

Facts In Submission

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CY2019	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
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CY2018Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	149200000	USD
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CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Before Reclassification Adjustments Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax	600000	USD
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CY2018Q4	wec	Deferred Tax Assets Uncertainty In Income Taxes DeferredTaxAssetsUncertaintyInIncomeTaxes	2000000	USD
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CY2019	dei	Document Annual Report DocumentAnnualReport	true
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CY2019	dei	Document Transition Report DocumentTransitionReport	false
CY2019	dei	Entity File Number EntityFileNumber	001-09057
CY2019	dei	Entity Registrant Name EntityRegistrantName	WEC ENERGY GROUP, INC.
CY2019	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	39-1391525
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CY2019	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	WI
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CY2019	dei	Entity Address Address Line2 EntityAddressAddressLine2	P.O. Box 1331
CY2019	dei	Entity Address City Or Town EntityAddressCityOrTown	Milwaukee
CY2019	dei	Entity Address State Or Province EntityAddressStateOrProvince	WI
CY2019	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	53201
CY2019	dei	City Area Code CityAreaCode	414
CY2019	dei	Local Phone Number LocalPhoneNumber	221-2345
CY2019	dei	Security12b Title Security12bTitle	Common Stock, $.01 Par Value
CY2019	dei	Trading Symbol TradingSymbol	WEC
CY2019	dei	Security Exchange Name SecurityExchangeName	NYSE
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CY2019Q4	us-gaap	Commercial Paper CommercialPaper	830800000	USD
CY2018Q4	us-gaap	Commercial Paper CommercialPaper	1440100000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	693200000	USD
CY2018Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	365000000.0	USD
CY2019Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	908100000	USD
CY2018Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	876400000	USD
CY2019Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	199800000	USD
CY2018Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	185400000	USD
CY2019Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	550800000	USD
CY2018Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	464800000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	3388100000	USD
CY2019Q4	us-gaap	Deferred Revenue Noncurrent DeferredRevenueNoncurrent	497100000	USD
CY2018Q4	us-gaap	Deferred Revenue Noncurrent DeferredRevenueNoncurrent	520400000	USD
CY2019Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	3992800000	USD
CY2018Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	4251600000	USD
CY2019Q4	us-gaap	Accrued Environmental Loss Contingencies Noncurrent AccruedEnvironmentalLossContingenciesNoncurrent	589200000	USD
CY2018Q4	us-gaap	Accrued Environmental Loss Contingencies Noncurrent AccruedEnvironmentalLossContingenciesNoncurrent	616400000	USD
CY2019Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	326200000	USD
CY2018Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	422800000	USD
CY2019Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	1128900000	USD
CY2018Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	1108100000	USD
CY2019Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	21514500000	USD
CY2018Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	20301400000	USD
CY2019Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2018Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q4	us-gaap	Common Stock Value CommonStockValue	3200000	USD
CY2018Q4	us-gaap	Common Stock Value CommonStockValue	3200000	USD
CY2019Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	4186600000	USD
CY2018Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	4250100000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	5927700000	USD
CY2018Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	5538200000	USD
CY2017	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	271700000	USD
CY2019Q4	us-gaap	Preferred Stock Value PreferredStockValue	30400000	USD
CY2018Q4	us-gaap	Preferred Stock Value PreferredStockValue	30400000	USD
CY2017	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	798600000	USD
CY2019Q4	us-gaap	Other Minority Interests OtherMinorityInterests	110800000	USD
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	33475800000	USD
CY2019	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	65900000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	1134700000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-4100000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-2600000	USD
CY2019Q4	wec	Total Common Shareholders Equity TotalCommonShareholdersEquity	10113400000	USD
CY2018Q4	wec	Total Common Shareholders Equity TotalCommonShareholdersEquity	9788900000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	1060500000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	1204900000	USD
CY2019	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	926300000	USD
CY2018	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	845800000	USD
CY2019	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	162900000	USD
CY2018	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	297300000	USD
CY2018Q4	us-gaap	Other Minority Interests OtherMinorityInterests	23400000	USD
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	34951800000	USD
CY2018	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	77600000	USD
CY2017	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	120500000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	2900000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	18600000	USD
CY2017	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	4800000	USD
CY2019	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	-98200000	USD
CY2018	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	-23500000	USD
CY2017	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	86400000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	1500000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	8800000	USD
CY2017	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-49300000	USD
CY2019	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	7100000	USD
CY2018	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	10000000.0	USD
CY2017	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	7100000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	1500000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	110600000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	8500000	USD
CY2019	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	78700000	USD
CY2018	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	-67600000	USD
CY2017	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	161800000	USD
CY2019	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	20600000	USD
CY2018	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	290400000	USD
CY2017	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-197400000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	2345500000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	2445500000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	2078600000	USD
CY2019	us-gaap	Payments To Acquire Other Property Plant And Equipment PaymentsToAcquireOtherPropertyPlantAndEquipment	2260800000	USD
CY2018	us-gaap	Payments To Acquire Other Property Plant And Equipment PaymentsToAcquireOtherPropertyPlantAndEquipment	2115700000	USD
CY2017	us-gaap	Payments To Acquire Other Property Plant And Equipment PaymentsToAcquireOtherPropertyPlantAndEquipment	1959500000	USD
CY2018	us-gaap	Payments To Acquire Assets Investing Activities PaymentsToAcquireAssetsInvestingActivities	162900000	USD
CY2019	us-gaap	Payments To Acquire Business Two Net Of Cash Acquired PaymentsToAcquireBusinessTwoNetOfCashAcquired	268200000	USD
CY2018	us-gaap	Payments To Acquire Business Two Net Of Cash Acquired PaymentsToAcquireBusinessTwoNetOfCashAcquired	0	USD
CY2017	us-gaap	Payments To Acquire Business Two Net Of Cash Acquired PaymentsToAcquireBusinessTwoNetOfCashAcquired	0	USD
CY2019	us-gaap	Payments To Acquire Assets Investing Activities PaymentsToAcquireAssetsInvestingActivities	0	USD
CY2018	us-gaap	Proceeds From Sales Of Business Affiliate And Productive Assets ProceedsFromSalesOfBusinessAffiliateAndProductiveAssets	12100000	USD
CY2017	us-gaap	Proceeds From Sales Of Business Affiliate And Productive Assets ProceedsFromSalesOfBusinessAffiliateAndProductiveAssets	24000000.0	USD
CY2017	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	109600000	USD
CY2019	us-gaap	Proceeds From Sales Of Business Affiliate And Productive Assets ProceedsFromSalesOfBusinessAffiliateAndProductiveAssets	37600000	USD
CY2019	us-gaap	Payments To Acquire Restricted Investments PaymentsToAcquireRestrictedInvestments	0	USD
CY2017	us-gaap	Payments To Acquire Assets Investing Activities PaymentsToAcquireAssetsInvestingActivities	0	USD
CY2019	us-gaap	Payments To Acquire Interest In Joint Venture PaymentsToAcquireInterestInJointVenture	0	USD
CY2018	us-gaap	Payments To Acquire Interest In Joint Venture PaymentsToAcquireInterestInJointVenture	77100000	USD
CY2017	us-gaap	Payments To Acquire Interest In Joint Venture PaymentsToAcquireInterestInJointVenture	0	USD
CY2019	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	0	USD
CY2018	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	61400000	USD
CY2017	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	0	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2017	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	226000000.0	USD
CY2019	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	52600000	USD
CY2018	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	53500000	USD
CY2019	us-gaap	Proceeds From Sale Of Restricted Investments ProceedsFromSaleOfRestrictedInvestments	200000	USD
CY2018	us-gaap	Proceeds From Sale Of Restricted Investments ProceedsFromSaleOfRestrictedInvestments	118600000	USD
CY2017	us-gaap	Proceeds From Sale Of Restricted Investments ProceedsFromSaleOfRestrictedInvestments	8700000	USD
CY2018	us-gaap	Payments To Acquire Restricted Investments PaymentsToAcquireRestrictedInvestments	65000000.0	USD
CY2017	us-gaap	Payments To Acquire Restricted Investments PaymentsToAcquireRestrictedInvestments	3700000	USD
CY2019	us-gaap	Proceeds From Collection Of Other Receivables ProceedsFromCollectionOfOtherReceivables	32400000	USD
CY2018	us-gaap	Proceeds From Collection Of Other Receivables ProceedsFromCollectionOfOtherReceivables	0	USD
CY2017	us-gaap	Proceeds From Collection Of Other Receivables ProceedsFromCollectionOfOtherReceivables	0	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-16500000	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-20500000	USD
CY2017	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-12000000.0	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2494900000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2384400000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2254100000	USD
CY2019	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	67000000.0	USD
CY2018	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	29100000	USD
CY2017	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	30800000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	140100000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	72400000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	71300000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	744500000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	697300000	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	656500000	USD
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1895000000.0	USD
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1740000000.0	USD
CY2017	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	435000000.0	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	360100000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	87500000	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-14100000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	953300000	USD
CY2017	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	154500000	USD
CY2019	us-gaap	Proceeds From Repayments Of Short Term Debt Maturing In Three Months Or Less ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess	-609300000	USD
CY2018	us-gaap	Proceeds From Repayments Of Short Term Debt Maturing In Three Months Or Less ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess	-4500000	USD
CY2017	us-gaap	Proceeds From Repayments Of Short Term Debt Maturing In Three Months Or Less ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess	584400000	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-22400000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-15200000	USD
CY2017	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-6500000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	85600000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	26400000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	161400000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-63800000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	146100000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	58600000	USD
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	72700000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	82300000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	146100000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	58600000	USD
CY2019	us-gaap	Use Of Estimates UseOfEstimates	We prepare our financial statements in conformity with GAAP. We make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results may differ from these estimates.
CY2019	wec	Maximum Term Of Original Maturity To Classify Instrument As Cash Equivalent MaximumTermOfOriginalMaturityToClassifyInstrumentAsCashEquivalent	P3M
CY2019Q4	us-gaap	Inventory Raw Materials And Supplies Net Of Reserves InventoryRawMaterialsAndSuppliesNetOfReserves	234200000	USD
CY2018Q4	us-gaap	Inventory Raw Materials And Supplies Net Of Reserves InventoryRawMaterialsAndSuppliesNetOfReserves	226600000	USD
CY2019Q4	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	227700000	USD
CY2018Q4	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	232900000	USD
CY2019Q4	us-gaap	Energy Related Inventory Other Fossil Fuel EnergyRelatedInventoryOtherFossilFuel	87900000	USD
CY2018Q4	us-gaap	Energy Related Inventory Other Fossil Fuel EnergyRelatedInventoryOtherFossilFuel	88700000	USD
CY2019Q4	us-gaap	Energy Related Inventory EnergyRelatedInventory	549800000	USD
CY2018Q4	us-gaap	Energy Related Inventory EnergyRelatedInventory	548200000	USD
CY2019Q4	us-gaap	Percentage Of Lifo Inventory PercentageOfLIFOInventory	0.19
CY2018Q4	us-gaap	Percentage Of Lifo Inventory PercentageOfLIFOInventory	0.16
CY2019	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	5900000	USD
CY2018	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	6900000	USD
CY2017	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	4900000	USD
CY2019	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	14400000	USD
CY2018	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	15200000	USD
CY2017	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	11400000	USD
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	34300000	shares
CY2019	us-gaap	Guarantees Indemnifications And Warranties Policies GuaranteesIndemnificationsAndWarrantiesPolicies	We follow the guidance of the Guarantees Topic of the FASB ASC, which requires, under certain circumstances, that the guarantor recognize a liability for the fair value of the obligation undertaken in issuing the guarantee at its inception.
CY2019Q1	wec	Impairment Losses Recorded Upon Adoption Of Asu201602 ImpairmentLossesRecordedUponAdoptionOfASU201602	0	USD
CY2019Q1	wec	Number Of Land Easements Considered Leases Upon Adoptionof Asu201602 NumberOfLandEasementsConsideredLeasesUponAdoptionofASU201602	0	land_easement
CY2019Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	49000000.0	USD
CY2019Q1	us-gaap	Operating Lease Liability OperatingLeaseLiability	48800000	USD
CY2019Q1	wec	Finance Capital Lease Expense Impact Of Asu201602 FinanceCapitalLeaseExpenseImpactOfASU201602	0	USD
CY2018Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	50700000	USD
CY2019Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	3506700000	USD
CY2018Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	3805100000	USD
CY2019Q4	us-gaap	Regulatory Assets RegulatoryAssets	3527600000	USD
CY2018Q4	us-gaap	Regulatory Assets RegulatoryAssets	3855800000	USD
CY2019	us-gaap	Revenues Revenues	7523100000	USD
CY2018	us-gaap	Revenues Revenues	7679500000	USD
CY2019Q4	us-gaap	Regulatory Assets RegulatoryAssets	3527600000	USD
CY2018Q4	us-gaap	Regulatory Assets RegulatoryAssets	3855800000	USD
CY2019Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	20900000	USD
CY2019Q4	us-gaap	Public Utilities Amount Of Allowance For Earnings On Equity Capitalized For Rate Making Purposes PublicUtilitiesAmountOfAllowanceForEarningsOnEquityCapitalizedForRateMakingPurposes	24300000	USD
CY2018Q4	us-gaap	Public Utilities Amount Of Allowance For Earnings On Equity Capitalized For Rate Making Purposes PublicUtilitiesAmountOfAllowanceForEarningsOnEquityCapitalizedForRateMakingPurposes	18200000	USD
CY2019Q4	us-gaap	Remaining Amounts Of Regulatory Assets For Which No Return On Investment During Recovery Period Is Provided RemainingAmountsOfRegulatoryAssetsForWhichNoReturnOnInvestmentDuringRecoveryPeriodIsProvided	175100000	USD
CY2019Q4	wec	Remaining Amounts Of Regulatory Assets Earning Short Term Interest Rate Return On Investment RemainingAmountsOfRegulatoryAssetsEarningShortTermInterestRateReturnOnInvestment	29100000	USD
CY2019Q4	wec	Remaining Amounts Of Regulatory Assets Earning Long Term Interest Rate Return On Investment RemainingAmountsOfRegulatoryAssetsEarningLongTermInterestRateReturnOnInvestment	151500000	USD
CY2019Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	4080400000	USD
CY2018Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	4288400000	USD
CY2019Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	87600000	USD
CY2018Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	36800000	USD
CY2019Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	3992800000	USD
CY2018Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	4251600000	USD
CY2019Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	4080400000	USD
CY2018Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	4288400000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	23620100000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	22000900000	USD
CY2018Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	461400000	USD
CY2017Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	573700000	USD
CY2016Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	557700000	USD
CY2019	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	22100000	USD
CY2018	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	28000000.0	USD
CY2017	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	27500000	USD
CY2019	wec	Asset Retirement Obligation Addition Revision Of Estimate AssetRetirementObligationAdditionRevisionOfEstimate	39100000	USD
CY2018	wec	Asset Retirement Obligation Addition Revision Of Estimate AssetRetirementObligationAdditionRevisionOfEstimate	-104500000	USD
CY2017	wec	Asset Retirement Obligation Addition Revision Of Estimate AssetRetirementObligationAdditionRevisionOfEstimate	26500000	USD
CY2019	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	39100000	USD
CY2017	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	38000000.0	USD
CY2018	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	35800000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	50200000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	36100000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	29000000.0	USD
CY2019	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	13800000	USD
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	483500000	USD
CY2018Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	461400000	USD
CY2017Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	573700000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	3052800000	USD
CY2017Q4	us-gaap	Goodwill Goodwill	3053500000	USD
CY2019	us-gaap	Goodwill Purchase Accounting Adjustments GoodwillPurchaseAccountingAdjustments	0	USD
CY2018	us-gaap	Goodwill Purchase Accounting Adjustments GoodwillPurchaseAccountingAdjustments	-700000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	3052800000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	3052800000	USD
CY2019Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	0	USD
CY2019Q3	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2018	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	9900000	USD
CY2017	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	11600000	USD
CY2018	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	1100000	shares
CY2017	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	1100000	shares
CY2019	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	140100000	USD
CY2018	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	72400000	USD
CY2019Q4	wec	Juniornotesminimuminterestdeferralpaymentperiodinperiods Juniornotesminimuminterestdeferralpaymentperiodinperiods	1	period
CY2019	wec	Maximuminterestpaymentdeferralperiod Maximuminterestpaymentdeferralperiod	P10Y
CY2019Q4	us-gaap	Amount Of Restricted Net Assets For Consolidated And Unconsolidated Subsidiaries AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries	7400000000	USD
CY2019Q4	us-gaap	Retained Earnings Undistributed Earnings From Equity Method Investees RetainedEarningsUndistributedEarningsFromEquityMethodInvestees	363000000	USD
CY2019	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	0	shares
CY2019	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	1800000	shares
CY2017	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	71300000	USD
CY2019Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.59
CY2019Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.59
CY2019Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.59
CY2019Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.59
CY2019Q4	us-gaap	Preferred Stock Value PreferredStockValue	30400000	USD
CY2019Q4	wec	Integrys Fair Value Adjustmentto Longterm Debt IntegrysFairValueAdjustmenttoLongtermDebt	14300000	USD
CY2019Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	2800000000.0	USD
CY2019Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	1966900000	USD
CY2019Q4	wec	Numberofextensionsavailableonacreditfacility Numberofextensionsavailableonacreditfacility	2	extension
CY2019	wec	Lengthofcreditfacilityextension Lengthofcreditfacilityextension	P1Y
CY2019Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	11922500000	USD
CY2018Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	10387600000	USD
CY2018Q4	wec	Integrys Fair Value Adjustmentto Longterm Debt IntegrysFairValueAdjustmenttoLongtermDebt	20600000	USD
CY2019Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	52900000	USD
CY2018Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	44700000	USD
CY2019Q4	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	25600000	USD
CY2018Q4	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	27800000	USD
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	11858300000	USD
CY2018Q4	us-gaap	Long Term Debt LongTermDebt	10335700000	USD
CY2019Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	686900000	USD
CY2018Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	360100000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	11171400000	USD
CY2018Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	9975600000	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	45900000	USD
CY2018Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	23300000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	8893200000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	6000000.0	USD
CY2019Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	11922500000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	686900000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	686900000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	1338800000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	390800000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	42800000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	570000000.0	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	5500000	USD
CY2018	us-gaap	Operating Lease Cost OperatingLeaseCost	5600000	USD
CY2017	us-gaap	Operating Lease Cost OperatingLeaseCost	6400000	USD
CY2019	us-gaap	Short Term Lease Cost ShortTermLeaseCost	600000	USD
CY2018	us-gaap	Short Term Lease Cost ShortTermLeaseCost	1500000	USD
CY2017	us-gaap	Short Term Lease Cost ShortTermLeaseCost	800000	USD
CY2019	us-gaap	Lease Cost LeaseCost	14300000	USD
CY2018	us-gaap	Lease Cost LeaseCost	14800000	USD
CY2017	us-gaap	Lease Cost LeaseCost	14400000	USD
CY2019	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	3300000	USD
CY2018	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	7700000	USD
CY2017	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	7200000	USD
CY2018	us-gaap	Operating Lease Payments OperatingLeasePayments	6500000	USD
CY2017	us-gaap	Operating Lease Payments OperatingLeasePayments	7100000	USD
CY2019	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	4900000	USD
CY2019	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	3300000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	27200000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	49000000.0	USD
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	4900000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Other Net PropertyPlantAndEquipmentOtherNet	19400000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	41400000	USD
CY2019Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P31Y6M
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P12Y10M24D
CY2019Q4	us-gaap	Property Plant And Equipment Other Net PropertyPlantAndEquipmentOtherNet	40600000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	41400000	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	45900000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	4400000	USD
CY2019Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	56800000	USD
CY2019Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	6300000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	6800000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	9300000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	4800000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	10300000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	4800000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	5100000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	4900000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	900000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	4800000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	900000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	30100000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	76200000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	56200000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	102700000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	14800000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	37000000.0	USD
CY2019Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	39600000	USD
CY2019Q4	us-gaap	Capital Lease Obligations Current CapitalLeaseObligationsCurrent	4900000	USD
CY2019Q4	us-gaap	Capital Lease Obligations Noncurrent CapitalLeaseObligationsNoncurrent	18400000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-37900000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-127500000	USD
CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	111800000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	167700000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	300100000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	274400000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	4800000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	2800000	USD
CY2017	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	2700000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	125000000.0	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	169800000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	383500000	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	264400000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	258100000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	34100000	USD
CY2019	wec	Federalexcessamortizationamount Federalexcessamortizationamount	-34900000	USD
CY2019	wec	Federalexcessamortizationeffectivetaxrate Federalexcessamortizationeffectivetaxrate	-0.028
CY2018	wec	Federalexcessamortizationamount Federalexcessamortizationamount	-16800000	USD
CY2018	wec	Federalexcessamortizationeffectivetaxrate Federalexcessamortizationeffectivetaxrate	-0.014
CY2017	wec	Federalexcessamortizationamount Federalexcessamortizationamount	0	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	11400000	USD
CY2017	wec	Federalexcessamortizationeffectivetaxrate Federalexcessamortizationeffectivetaxrate	0
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2017	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	555500000	USD
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	80400000	USD
CY2019	wec	Effective Income Tax Rate Reconciliation State And Local Income Taxes Net Of Federal Tax Benefit EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxesNetOfFederalTaxBenefit	0.064
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	71800000	USD
CY2018	wec	Effective Income Tax Rate Reconciliation State And Local Income Taxes Net Of Federal Tax Benefit EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxesNetOfFederalTaxBenefit	0.058
CY2017	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	100800000	USD
CY2017	wec	Effective Income Tax Rate Reconciliation State And Local Income Taxes Net Of Federal Tax Benefit EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxesNetOfFederalTaxBenefit	0.064
CY2019	wec	Taxrepairsamount Taxrepairsamount	-122800000	USD
CY2019	wec	Taxrepairspercentage Taxrepairspercentage	-0.098
CY2018	wec	Taxrepairsamount Taxrepairsamount	-120700000	USD
CY2018	wec	Taxrepairspercentage Taxrepairspercentage	-0.098
CY2017	wec	Taxrepairsamount Taxrepairsamount	0	USD
CY2017	wec	Taxrepairspercentage Taxrepairspercentage	0
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Other EffectiveIncomeTaxRateReconciliationTaxCreditsOther	0.027
CY2018	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	12100000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Other EffectiveIncomeTaxRateReconciliationTaxCreditsOther	0.010
CY2017	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	16800000	USD
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Other EffectiveIncomeTaxRateReconciliationTaxCreditsOther	0.011
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Amount EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount	-15800000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.013
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Amount EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount	-5900000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.005
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Amount EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount	-10000000.0	USD
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.006
CY2019	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	4800000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Investment EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment	0.004
CY2018	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	2800000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Investment EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment	0.002
CY2017	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	2700000	USD
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Investment EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment	0.002
CY2019	wec	Income Tax Reconciliation Allowance For Funds Used During Construction Capitalized Cost Of Equity IncomeTaxReconciliationAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	3000000.0	USD
CY2019	wec	Effective Income Tax Rate Reconciliation Allowance For Funds Used During Construction Capitalized Cost Of Equity EffectiveIncomeTaxRateReconciliationAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	0.002
CY2018	wec	Income Tax Reconciliation Allowance For Funds Used During Construction Capitalized Cost Of Equity IncomeTaxReconciliationAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	3200000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	962100000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	3609000000.0	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	125000000.0	USD
CY2019	wec	Income Tax Expense Benefit Effective Tax Rate IncomeTaxExpenseBenefitEffectiveTaxRate	0.099
CY2018Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	3436900000	USD
CY2019Q4	wec	Deferred Tax Assets Tax Gross Up Regulatory Items Non Current DeferredTaxAssetsTaxGrossUpRegulatoryItemsNonCurrent	519800000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	169800000	USD
CY2018	wec	Income Tax Expense Benefit Effective Tax Rate IncomeTaxExpenseBenefitEffectiveTaxRate	0.138
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	383500000	USD
CY2019Q4	wec	Deferred Tax Liabilities Investment In Transmission Affiliate Non Current DeferredTaxLiabilitiesInvestmentInTransmissionAffiliateNonCurrent	531700000	USD
CY2018	wec	Effective Income Tax Rate Reconciliation Allowance For Funds Used During Construction Capitalized Cost Of Equity EffectiveIncomeTaxRateReconciliationAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	0.003
CY2017	wec	Income Tax Reconciliation Allowance For Funds Used During Construction Capitalized Cost Of Equity IncomeTaxReconciliationAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	4000000.0	USD
CY2017	wec	Effective Income Tax Rate Reconciliation Allowance For Funds Used During Construction Capitalized Cost Of Equity EffectiveIncomeTaxRateReconciliationAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	0.003
CY2019	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0
CY2018	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0
CY2017	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-226900000	USD
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	-0.143
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-4400000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.003
CY2018	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	1400000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.002
CY2017	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-12400000	USD
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.008
CY2017	wec	Income Tax Expense Benefit Effective Tax Rate IncomeTaxExpenseBenefitEffectiveTaxRate	0.241
CY2017	wec	Net Impactof Tax Cutsand Jobs Actof2017 NetImpactofTaxCutsandJobsActof2017	206700000	USD
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2018Q1	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2017Q4	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	2657000000	USD
CY2017	wec	Net Impactof Tax Cutsand Jobs Actof2017 NetImpactofTaxCutsandJobsActof2017	206700000	USD
CY2018Q4	wec	Deferred Tax Assets Tax Gross Up Regulatory Items Non Current DeferredTaxAssetsTaxGrossUpRegulatoryItemsNonCurrent	579200000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	884600000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	886900000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	973500000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	106300000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	129300000	USD
CY2019Q4	wec	Deferred Tax Assets Future Federal Tax Benefits Non Current DeferredTaxAssetsFutureFederalTaxBenefitsNonCurrent	101000000.0	USD
CY2018Q4	wec	Deferred Tax Assets Future Federal Tax Benefits Non Current DeferredTaxAssetsFutureFederalTaxBenefitsNonCurrent	70600000	USD
CY2019Q4	wec	Deferred Tax Assets Other Non Current DeferredTaxAssetsOtherNonCurrent	159800000	USD
CY2018Q4	wec	Deferred Tax Assets Other Non Current DeferredTaxAssetsOtherNonCurrent	194400000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	2300000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	176000000.0	USD
CY2018Q4	wec	Deferred Tax Liabilities Investment In Transmission Affiliate Non Current DeferredTaxLiabilitiesInvestmentInTransmissionAffiliateNonCurrent	420600000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	232000000.0	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	2300000	USD
CY2019Q4	wec	Deferred Tax Liabilities Employee Benefits And Compensation Non Current DeferredTaxLiabilitiesEmployeeBenefitsAndCompensationNonCurrent	131400000	USD
CY2018Q4	wec	Deferred Tax Liabilities Employee Benefits And Compensation Non Current DeferredTaxLiabilitiesEmployeeBenefitsAndCompensationNonCurrent	121200000	USD
CY2019Q4	wec	Deferred Tax Liabilities Other Non Current DeferredTaxLiabilitiesOtherNonCurrent	149800000	USD
CY2018Q4	wec	Deferred Tax Liabilities Other Non Current DeferredTaxLiabilitiesOtherNonCurrent	195500000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Gross Noncurrent DeferredTaxLiabilitiesGrossNoncurrent	4653900000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Gross Noncurrent DeferredTaxLiabilitiesGrossNoncurrent	4350200000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	3769300000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	3388100000	USD
CY2019Q4	wec	Balanceof Tax Benefit Carryforward BalanceofTaxBenefitCarryforward	287100000	USD
CY2019Q4	wec	Deferred Tax Assets Future Federal Tax Benefits Non Current DeferredTaxAssetsFutureFederalTaxBenefitsNonCurrent	101000000.0	USD
CY2018Q4	wec	Balanceof Tax Benefit Carryforward BalanceofTaxBenefitCarryforward	275900000	USD
CY2018Q4	wec	Deferred Tax Assets Future Federal Tax Benefits Non Current DeferredTaxAssetsFutureFederalTaxBenefitsNonCurrent	70600000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	11400000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	20000000.0	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	17300000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	1900000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	2800000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	200000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	100000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	4200000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	200000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	17900000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	20000000.0	USD
CY2019Q4	wec	Deferred Tax Assets Uncertainty In Income Taxes DeferredTaxAssetsUncertaintyInIncomeTaxes	2000000.0	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	15900000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	18000000.0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	100000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	500000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	600000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense	0	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	800000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued	0	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	700000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued	0	USD
CY2019	wec	Unrecognizedtaxbenefitsdecreaseresultingfromstatuteoflimitations Unrecognizedtaxbenefitsdecreaseresultingfromstatuteoflimitations	11400000	USD
CY2019	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	18700000	USD
CY2017	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	18800000	USD
CY2018Q4	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis With Unobservable Inputs FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs	7400000	USD
CY2017Q4	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis With Unobservable Inputs FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs	4400000	USD
CY2016Q4	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis With Unobservable Inputs FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs	5100000	USD
CY2019	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Purchases FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchases	12800000	USD
CY2018	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Purchases FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchases	18400000	USD
CY2017	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Purchases FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchases	13800000	USD
CY2019	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Settlements FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements	17100000	USD
CY2018	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Settlements FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements	15400000	USD
CY2017	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Settlements FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements	14500000	USD
CY2019Q4	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis With Unobservable Inputs FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs	3100000	USD
CY2018Q4	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis With Unobservable Inputs FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs	7400000	USD
CY2017Q4	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis With Unobservable Inputs FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs	4400000	USD
CY2019Q4	us-gaap	Derivative Instruments And Hedges DerivativeInstrumentsAndHedges	6700000	USD
CY2019Q4	wec	Derivative Instruments And Hedges Liabilities Gross Current DerivativeInstrumentsAndHedgesLiabilitiesGrossCurrent	24800000	USD
CY2018Q4	us-gaap	Derivative Instruments And Hedges DerivativeInstrumentsAndHedges	15300000	USD
CY2018Q4	us-gaap	Derivative Asset Fair Value Gross Asset Including Not Subject To Master Netting Arrangement DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement	15900000	USD
CY2018Q4	wec	Derivative Instruments And Hedges Liabilities Gross Current DerivativeInstrumentsAndHedgesLiabilitiesGrossCurrent	5800000	USD
CY2018Q4	us-gaap	Derivative Liability Fair Value Gross Liability Including Not Subject To Master Netting Arrangement DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement	7900000	USD
CY2019Q4	wec	Guarantee Obligations Maximum Exposure Expire Over Three Years GuaranteeObligationsMaximumExposureExpireOverThreeYears	133400000	USD
CY2019Q4	us-gaap	Derivative Instruments And Hedges Noncurrent DerivativeInstrumentsAndHedgesNoncurrent	200000	USD
CY2019Q4	us-gaap	Derivative Instruments And Hedges Liabilities Noncurrent DerivativeInstrumentsAndHedgesLiabilitiesNoncurrent	4100000	USD
CY2018Q4	us-gaap	Derivative Instruments And Hedges Noncurrent DerivativeInstrumentsAndHedgesNoncurrent	600000	USD
CY2018Q4	us-gaap	Derivative Instruments And Hedges Liabilities Noncurrent DerivativeInstrumentsAndHedgesLiabilitiesNoncurrent	2100000	USD
CY2019Q4	us-gaap	Derivative Asset Fair Value Gross Asset Including Not Subject To Master Netting Arrangement DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement	6900000	USD
CY2019Q4	us-gaap	Derivative Liability Fair Value Gross Liability Including Not Subject To Master Netting Arrangement DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement	28900000	USD
CY2019	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-10800000	USD
CY2018	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	42100000	USD
CY2017	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	4700000	USD
CY2019Q4	us-gaap	Derivative Collateral Right To Reclaim Cash DerivativeCollateralRightToReclaimCash	34400000	USD
CY2018Q4	us-gaap	Derivative Collateral Right To Reclaim Cash DerivativeCollateralRightToReclaimCash	2700000	USD
CY2018Q4	us-gaap	Derivative Collateral Obligation To Return Cash DerivativeCollateralObligationToReturnCash	200000	USD
CY2019Q4	us-gaap	Derivative Asset Fair Value Gross Asset Including Not Subject To Master Netting Arrangement DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement	6900000	USD
CY2019Q4	us-gaap	Derivative Liability Fair Value Gross Liability Including Not Subject To Master Netting Arrangement DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement	28900000	USD
CY2018Q4	us-gaap	Derivative Asset Fair Value Gross Asset Including Not Subject To Master Netting Arrangement DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement	15900000	USD
CY2018Q4	us-gaap	Derivative Liability Fair Value Gross Liability Including Not Subject To Master Netting Arrangement DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement	7900000	USD
CY2019Q4	us-gaap	Derivative Asset Fair Value Gross Liability And Obligation To Return Cash Offset DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset	1400000	USD
CY2019Q4	us-gaap	Derivative Liability Fair Value Gross Asset And Right To Reclaim Cash Offset DerivativeLiabilityFairValueGrossAssetAndRightToReclaimCashOffset	21400000	USD
CY2018Q4	us-gaap	Derivative Asset Fair Value Gross Liability And Obligation To Return Cash Offset DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset	4000000.0	USD
CY2018Q4	us-gaap	Derivative Liability Fair Value Gross Asset And Right To Reclaim Cash Offset DerivativeLiabilityFairValueGrossAssetAndRightToReclaimCashOffset	4900000	USD
CY2019Q4	us-gaap	Derivative Assets DerivativeAssets	5500000	USD
CY2019Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	7500000	USD
CY2018Q4	us-gaap	Derivative Assets DerivativeAssets	11900000	USD
CY2018Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	3000000.0	USD
CY2019Q4	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	20000000.0	USD
CY2018Q4	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	200000	USD
CY2018Q4	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	1100000	USD
CY2019Q4	us-gaap	Guarantee Obligations Maximum Exposure GuaranteeObligationsMaximumExposure	156000000.0	USD
CY2019Q4	wec	Guarantee Obligations Maximum Exposure Expire Less Than One Year GuaranteeObligationsMaximumExposureExpireLessThanOneYear	22200000	USD
CY2019	us-gaap	Interest Expense InterestExpense	501500000	USD
CY2018	us-gaap	Interest Expense InterestExpense	445100000	USD
CY2017	us-gaap	Interest Expense InterestExpense	415700000	USD
CY2019	us-gaap	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths	-1000000.0	USD
CY2019Q4	wec	Guarantee Obligations Maximum Exposure Expire Within One To Three Years GuaranteeObligationsMaximumExposureExpireWithinOneToThreeYears	400000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2417100000	USD
CY2018Q4	us-gaap	Assets Assets	33475800000	USD
CY2017	us-gaap	Revenues Revenues	7648500000	USD
CY2017	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	2056100000	USD
CY2018	us-gaap	Revenues Revenues	7679500000	USD
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	798600000	USD
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	50900000	USD
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	49300000	USD
CY2017	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	47900000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	1531400000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	1776100000	USD
CY2019	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	2184800000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	926300000	USD
CY2019	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	6	segment
CY2019	us-gaap	Revenues Revenues	7523100000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	127600000	USD
CY2019	us-gaap	Interest Expense InterestExpense	501500000	USD
CY2019Q4	us-gaap	Assets Assets	34951800000	USD
CY2018	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	2270500000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	845800000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	1468400000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	136700000	USD
CY2018	us-gaap	Interest Expense InterestExpense	445100000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2529000000.0	USD
CY2017	us-gaap	Interest Expense InterestExpense	415700000	USD
CY2017	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	154300000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1959500000	USD
CY2017Q4	us-gaap	Assets Assets	31590500000	USD
CY2019Q4	us-gaap	Purchase Obligation PurchaseObligation	11570000000.0	USD
CY2019Q4	us-gaap	Purchase Obligation Due In Next Twelve Months PurchaseObligationDueInNextTwelveMonths	1231100000	USD
CY2019Q4	us-gaap	Purchase Obligation Due In Second Year PurchaseObligationDueInSecondYear	1112300000	USD
CY2019Q4	us-gaap	Purchase Obligation Due In Third Year PurchaseObligationDueInThirdYear	1040600000	USD
CY2019Q4	us-gaap	Purchase Obligation Due In Fourth Year PurchaseObligationDueInFourthYear	946800000	USD
CY2019Q4	us-gaap	Purchase Obligation Due In Fifth Year PurchaseObligationDueInFifthYear	720700000	USD
CY2019Q4	us-gaap	Purchase Obligation Due After Fifth Year PurchaseObligationDueAfterFifthYear	6518500000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	485900000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	441500000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	413700000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	24900000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-16300000	USD
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	5200000	USD
CY2019	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	159900000	USD
CY2018	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	65900000	USD
CY2017	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	169200000	USD
CY2019	wec	Noncontrolling Interest Increasefrom Capital Contributions NoncontrollingInterestIncreasefromCapitalContributions	21000000.0	USD
CY2018	wec	Noncontrolling Interest Increasefrom Capital Contributions NoncontrollingInterestIncreasefromCapitalContributions	0	USD
CY2017	wec	Noncontrolling Interest Increasefrom Capital Contributions NoncontrollingInterestIncreasefromCapitalContributions	0	USD
CY2019	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	14400000	USD
CY2018	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	15200000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	37500000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	84500000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	38900000	USD
CY2019Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	0	USD
CY2018Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	2500000	USD
CY2017Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	0	USD
CY2019Q4	us-gaap	Restricted Cash Noncurrent RestrictedCashNoncurrent	44800000	USD
CY2018Q4	us-gaap	Restricted Cash Noncurrent RestrictedCashNoncurrent	59100000	USD
CY2017Q4	us-gaap	Restricted Cash Noncurrent RestrictedCashNoncurrent	19700000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	82300000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	146100000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	58600000	USD
CY2018Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	330800000	USD
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.74
CY2017	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	11400000	USD
CY2019Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.77
CY2018	wec	Other Unclassified Nonoperating Income Expense OtherUnclassifiedNonoperatingIncomeExpense	30900000	USD
CY2017	wec	Other Unclassified Nonoperating Income Expense OtherUnclassifiedNonoperatingIncomeExpense	31700000	USD
CY2019	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	-36200000	USD
CY2018	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	-26000000.0	USD
CY2017	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	-9100000	USD
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.60
CY2019	us-gaap	Gain Loss On Investments GainLossOnInvestments	21200000	USD
CY2018	us-gaap	Gain Loss On Investments GainLossOnInvestments	-1800000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	302700000	USD
CY2018Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	289800000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	1468400000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	102200000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1134000000.0	USD
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.33
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.75
CY2018Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	545100000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	70300000	USD
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	73700000	USD
CY2019Q1	us-gaap	Revenues Revenues	2377400000	USD
CY2019Q2	us-gaap	Revenues Revenues	1590200000	USD
CY2019Q3	us-gaap	Revenues Revenues	1608000000.0	USD
CY2019Q4	us-gaap	Revenues Revenues	1947500000	USD
CY2019	us-gaap	Revenues Revenues	7523100000	USD
CY2019Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	542800000	USD
CY2019Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	314600000	USD
CY2019Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	310900000	USD
CY2019Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	363100000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	1531400000	USD
CY2019Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	420100000	USD
CY2019Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	235700000	USD
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	234300000	USD
CY2019Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	243900000	USD
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.33
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.74
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.74
CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.77
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.58
CY2018Q1	us-gaap	Revenues Revenues	2286500000	USD
CY2018Q2	us-gaap	Revenues Revenues	1672500000	USD
CY2018Q3	us-gaap	Revenues Revenues	1643700000	USD
CY2018Q4	us-gaap	Revenues Revenues	2076800000	USD
CY2018	us-gaap	Revenues Revenues	7679500000	USD
CY2018Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	390100000	USD
CY2018Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	231000000.0	USD
CY2018	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	94700000	USD
CY2018Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	233200000	USD
CY2018Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	205000000.0	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1059300000	USD
CY2018Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.24
CY2018Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.73
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.74
CY2018Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.65
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.36
CY2018Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.23
CY2018Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.73
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.74
CY2018Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.65
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.34
CY2018Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	149200000	USD
CY2019	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	85800000	USD
CY2019	us-gaap	Valuation Allowances And Reserves Charged To Other Accounts ValuationAllowancesAndReservesChargedToOtherAccounts	11400000	USD
CY2019	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	106400000	USD
CY2019Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	140000000.0	USD
CY2017Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	143200000	USD
CY2018	us-gaap	Valuation Allowances And Reserves Charged To Other Accounts ValuationAllowancesAndReservesChargedToOtherAccounts	-5500000	USD
CY2018	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	83200000	USD
CY2018Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	149200000	USD
CY2016Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	108000000.0	USD
CY2017	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	96700000	USD
CY2017	us-gaap	Valuation Allowances And Reserves Charged To Other Accounts ValuationAllowancesAndReservesChargedToOtherAccounts	16400000	USD
CY2017	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	77900000	USD
CY2017Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	143200000	USD

Files In Submission

Name	View Source	Status
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0000107815-20-000089-index.html	Edgar Link	pending
0000107815-20-000089.txt	Edgar Link	pending
0000107815-20-000089-xbrl.zip	Edgar Link	pending
a2019wec10k.htm	Edgar Link	pending
a2019wec10kexhibit211.htm	Edgar Link	pending
a2019wec10kexhibit231.htm	Edgar Link	pending
a2019wec10kexhibit311.htm	Edgar Link	pending
a2019wec10kexhibit312.htm	Edgar Link	pending
a2019wec10kexhibit321.htm	Edgar Link	pending
a2019wec10kexhibit322.htm	Edgar Link	pending
a2019wec10kexhibit42.htm	Edgar Link	pending
a2019wec10k_htm.xml	Edgar Link	completed
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
image0a14.jpg	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
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R107.htm	Edgar Link	pending
R108.htm	Edgar Link	pending
R109.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R110.htm	Edgar Link	pending
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$WEC
WEC ENERGY GROUP, INC. Stock $wec

2019 Q4 Form 10-K Financial Statement

#000010781520000089 Filed on February 27, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$WEC WEC ENERGY GROUP, INC. Stock $wec

2019 Q4 Form 10-K Financial Statement

#000010781520000089 Filed on February 27, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$WEC
WEC ENERGY GROUP, INC. Stock $wec