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Treasury stock Treasury Stock, Value Issuance under various plans Stock Issued During The Period, Value, Retirement Savings Plan And Dividend Reinvestment Plan Stock Issued During The Period, Value, Retirement Savings Plan And Dividend Reinvestment Plan Customer deposits and refunds Increase (Decrease) in Contract with Customer, Liability Schedule of Segment Reporting Information by Segment Segment Reporting [Table Text Block] Total Other Comprehensive Income (Loss), net of tax Other comprehensive loss Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Reconciliation of Denominator: Reconciliation Of Numerator [Abstract] Reconciliation of numerator: Segment Reporting, Profit (Loss) [Abstract] Segment Reporting, Profit (Loss) [Abstract] Propane delivery operations Florida Propane [Member] Florida Propane [Member] Long-term debt including current maturities Long-Term Debt Aspire Energy Aspire Energy [Member] Aspire [Member] Document Period End Date Document Period End Date Changes in assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Company's exposure in number of former Manufactured Gas Plant Sites Companys Exposure In Number Of Former Manufactured Gas Plant Sites Company's exposure in number of former Manufactured Gas Plant Sites. 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December 2033 [Member] Uncollateralized Senior Note Due December 2033 Accrued interest Interest Payable, Current Energy distribution Energy Distribution [Member] Energy Distribution [Member] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Peninsula Pipeline Holdings Peninsula Pipeline Holdings [Member] Peninsula Pipeline Holdings Calculation of Earnings Per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Earnings Per Share of Common Stock: Earnings Per Share [Abstract] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Trading Symbol Trading Symbol Geographical [Domain] Geographical [Domain] Aspire Energy Express Aspire Energy Express [Member] Aspire Energy Express 6.44% notes, due December 2027 Uncollateralized Senior Note Due December 2027 [Member] Uncollateralized Senior Note Due December 2027 Property, plant and equipment expenditures Payments to Acquire Property, Plant, and Equipment Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Investments—guaranteed income fund Guaranteed Income Fund [Member] Guaranteed Income Fund [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Deferred compensation employer matching contribution rate Deferred Compensation Employer Matching Contribution Rate Deferred Compensation Employer Matching Contribution Rate Company Selected Measure Name Company Selected Measure Name Employee deferral rate Employee Deferral Rate Deferral rate employees can make Interim rates Interim Rates Interim Rates Delmar Regional Enhancement Delmar 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Total base rate increase Total Base Rate Increase Total Base Rate Increase Unrealized gain on investments and commodity contracts Unrealized Gain (Loss) on Commodity Contracts Common stock dividends Payments of Ordinary Dividends, Common Stock Expiration Date Trading Arrangement Expiration Date Draws on letters of credit Standby Letters Of Credit Standby Letters Of Credit Investments, at fair value Investments Investments, Fair Value Disclosure Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Propane operations Propane Delivery [Member] Propane Delivery [Member] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Derivative [Table] Derivative [Table] Other Income and Expenses [Abstract] Common stock, shares authorized (shares) Common Stock, Shares Authorized Energy generation Energy Generation [Member] Energy Generation [Member] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Unregulated Energy Unregulated Energy [Member] Unregulated energy. 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due September 2030 Uncollateralized Senior Note Due September 2030 [Member] Uncollateralized Senior Note Due September 2030 Manufactured Gas Plant (MGP) Manufactured Gas Plant [Member] Manufactured Gas Plant [Member] Equity Method Investment [Table] Equity Method Investment [Table] Other current assets Other Assets, Current Deferred compensation obligation Compensation and Benefits Trust Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] 3.25% notes, due April 2032 Uncollateralized Senior Note Due April Two Thousand Thirty Two [Member] Uncollateralized Senior Note Due April Two Thousand Thirty Two Other comprehensive income (loss), cash flow hedge, gain (loss), reclassification, tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax Operating Income Operating Income (Loss) Revenue, remaining performance obligation, amount Revenue, Remaining Performance Obligation, Amount Current Fiscal Year End Date Current Fiscal Year End Date 6.43% notes, due May 2028 Uncollateralized Senior Note Due On May 2 Two Thousand Twenty Eight [Member] Uncollateralized Senior Note Due On May Two Thousand Twenty Eight Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Derivative assets, at fair value Energy Marketing Contracts Assets, Noncurrent Derivative [Line Items] Derivative [Line Items] Acquisitions Business Combination [Text Block] Proprosed rates Proprosed Rates Proprosed Rates Natural gas distribution operations Natural Gas Distribution Operations [Member] Natural gas distribution operations [Member] Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Common stock, dividends declared (USD per share) Common Stock, Dividends, Per Share, Declared Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Share-based compensation and tax benefit Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Deferred compensation plan held Rabbi Trust (in shares) Shares Held In Trust For Deferred Compensation Plan Deferred compensation plan held Rabbi Trust. 3.73% notes, due December 2028 Uncollateralized Senior Note Two Due on December Two Thousand Twenty Eight [Member] Uncollateralized Senior Note Due on December Two Thousand Twenty Eight [Member] Other taxes Taxes, Other Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Uncollateralized senior note due Uncollateralized Senior Notes Aggregate [Member] Uncollateralized Senior Notes Aggregate Measure: Measure [Axis] Equity Method Investments and Joint Ventures Disclosure Equity Method Investments and Joint Ventures Disclosure [Text Block] Regulated Energy Regulated Operating Revenue Intrinsic value of the SICP awards Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested Deferred annual rate case recovery Deferred Rate Case Recovery Deferred Rate Case Recovery Environmental liabilities Accrued Environmental Loss Contingencies, Noncurrent Stockholders' Equity Comprehensive Income (Loss) Note [Text Block] Equity Components [Axis] Equity Components [Axis] Accounts receivable and accrued revenue Increase (Decrease) in Accounts Receivable Product and Service [Domain] Product and Service [Domain] Regulatory assets and liabilities, net Increase (Decrease) in Regulatory Assets and Liabilities Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Entity Interactive Data Current Entity Interactive Data Current Deferred income taxes Deferred Income Tax Liabilities, Net Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] 2.96% notes, due August 2035 Uncollateralized Senior Note Due August Two Thousand Thirty Five [Member] Uncollateralized Senior Note Due August Two Thousand Thirty Five Entity Small Business Entity Small Business Regulated Energy Public Utilities, Property, Plant and Equipment, Plant in Service Comprehensive Income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Termination Date Trading Arrangement Termination Date Shares issued under the performance incentive plan withheld for employee taxes (in shares) Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Change in cash overdrafts due to outstanding checks Increase (Decrease) in Outstanding Checks, Financing Activities Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] 3.98% notes, due August 2039 Uncollateralized Senior Note Due November Two Thousand Thirty Nine [Member] Uncollateralized Senior Note Due November Two Thousand Thirty Nine MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Document Type Document Type Short-Term Borrowing [Abstract] Short-Term Borrowing [Abstract] Short-Term Borrowing [Abstract] 6.39% notes, due December 2026 Uncollateralized Senior Note Due December 2026 [Member] Uncollateralized Senior Note Due December 2026 Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value as of Grant Date Award Grant Date Fair Value Summary of Accounting Policies Significant Accounting Policies [Text Block] Base rate increase Base Rate Increase Base Rate Increase Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Maintenance Operating Costs and Expenses Arrangement Duration Trading Arrangement Duration Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Marlin Gas Services Marlin Gas Services [Member] Marlin Gas Services [Member] Local Phone Number Local Phone Number Consolidation Items [Axis] Consolidation Items [Axis] Entity Registrant Name Entity Registrant Name Entity Address, Postal Zip Code Entity Address, Postal Zip Code Rabbi Trust Associated With Deferred Compensation Plan Rabbi Trust Associated With Deferred Compensation Plan [Member] Rabbi Trust Associated With Deferred Compensation Plan [Member] Income Before Income Taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Storm Reserve Storm Reserve [Member] Storm Reserve [Member] Environmental and other commitments and contingencies (Notes 7 and 8) Commitments and Contingencies Total Operating Revenues Revenues Revenues Total property, plant and equipment Property, Plant, and Equipment, before Accumulated Depreciation, Depletion, and Amortization Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Accounts payable and other accrued liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] Vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Capitalization and Liabilities Liabilities and Equity [Abstract] Other Commitments [Table] Other Commitments [Table] NEER NEER [Member] NEER Financial Assets and Liabilities Measured at Fair Value on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Award Type [Domain] Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Significant Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 [Member] FPU natural gas distribution Florida Public Utilities Company [Member] Florida public utilities company. Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] PEO Name PEO Name Geographical [Axis] Geographical [Axis] FCG transaction and transition-related expenses Transaction-related expenses Transaction-related expenses Accrued revenue Accrued Revenue Accrued revenue. Schedule of Short-term Debt [Table] Short-Term Debt [Table] Retirement Plan Name [Domain] Retirement Plan Name [Domain] Other segment items Segment Reporting, Other Segment Item, Amount Eastern Shore Eastern Shore Gas Company [Member] Eastern shore Gas Company. Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number 6.73% notes, due December 2038 Uncollateralized Senior Note Due December 2038 [Member] Uncollateralized Senior Note Due December 2038 Legal Entity [Axis] Legal Entity [Axis] Ratio of indebtedness to net capital Ratio of Indebtedness to Net Capital Peninsula pipeline company Peninsula Pipeline Company [Member] Peninsula Pipeline Company [Member] Other Commitments [Line Items] Other Commitments [Line Items] Less: tax benefit Share-Based Payment Arrangement, Expense, Tax Benefit 2.98% notes, due December 2034 Term Note Due January Two Thousand Twenty [Member] Term Note Due January Two Thousand Twenty [Member] Cash and Cash Equivalents—Beginning of Period Cash and Cash Equivalents—End of Period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Other accrued liabilities Other Accrued Liabilities, Current Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] TCJA Impact TCJA Impact [Member] TCJA Impact [Domain] Deferred Charges and Other Assets Deferred Charges And Other Assets [Abstract] Deferred Charges and Other Assets. Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Prudential [Member] Prudential [Member] Prudential [Member] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Debt Instrument [Axis] Debt Instrument [Axis] Share-based compensation Share-Based Payment Arrangement, Noncash Expense Outstanding Long-Term Debt Schedule of Debt [Table Text Block] Realized gain on commodity contracts and sale of assets Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Basic (in dollars per share) Basic Earnings Per Share (in dollars per share) Earnings Per Share, Basic Contract liabilities (current), beginning balance Contract liabilities (current), ending balance Contract with Customer, Liability, Current Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Total long-term debt, net of current maturities Long-Term Debt, Excluding Current Maturities Award Type [Axis] Award Type [Axis] Treasury stock activities Treasury Stock Activity And Deferred Compensation Plan Activity During Period Value Treasury Stock Activity And Deferred Compensation Plan Activity During Period Value Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Trade and other receivables, net Accounts Receivable, after Allowance for Credit Loss, Current Retained earnings Retained Earnings (Accumulated Deficit) Product and Service [Axis] Product and Service [Axis] Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Short-term Debt [Line Items] Short-Term Debt [Line Items] Debt instrument, unused borrowing capacity, amount Debt Instrument, Unused Borrowing Capacity, Amount Common Stock Common Stock [Member] Other Businesses and Eliminations Other Operating Revenue Operating revenues from other businesses and eliminations RSAM RSAM Reserve Surplus amortization mechanism (RSAM) Debt service coverage ratio Debt Service Coverage Ratio Debt Service Coverage Ratio Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cover [Abstract] Other Businesses and Eliminations Other [Member] Other [Member] Short-term debt, weighted average interest rate, at point in time Short-Term Debt, Weighted Average Interest Rate, at Point in Time Derivative Contract [Domain] Derivative Contract [Domain] Equity Awards Adjustments Equity Awards Adjustments [Member] Line of credit facility, increase request Line of Credit Facility, Accordion Feature, Increase Limit Line of Credit Facility, Accordion Feature, Increase Limit Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Total Capitalization and Liabilities Liabilities and Equity Peninsula Pipeline Peninsula Pipeline [Member] Peninsula Pipeline [Member] Employee Stock Option Share-Based Payment Arrangement, Option [Member] Segments [Axis] Business Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Asset Class [Axis] Asset Class [Axis] Plan Name [Axis] Plan Name [Axis] Guarantee Type [Axis] Guarantee Type [Axis] Guarantee Type Tabular List, Table Tabular List [Table Text Block] Share-Based Payment Arrangement, Cost by Plan Share-Based Payment Arrangement, Cost by Plan [Table Text Block] Other income, net Other income, net Other Nonoperating Income (Expense) Long-Term Debt Long-Term Debt [Text Block] Name Awards Close in Time to MNPI Disclosures, Individual Name Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Forfeited Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Property, Plant and Equipment Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization [Abstract] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Regulatory liabilities Regulatory Liability Preferred stock, par value $0.01 per share (authorized 2,000,000 shares), no shares issued and outstanding Preferred Stock, Value, Issued Total deferred charges and other assets Deferred Charges And Other Assets Total deferred charges and other assets Eastern Shore and Peninsula Pipeline Eastern Shore and Peninsula Pipeline [Member] Eastern Shore and Peninsula Pipeline [Member] Adjustment to Compensation: Adjustment to Compensation [Axis] 3.58% notes, due November 2038 Uncollateralized Senior Note Due November Two Thousand Thirty Eight [Member] Uncollateralized Senior Note Due November Two Thousand Thirty Eight Florida electric distribution Florida Electric Distribution [Member] Florida Electric Distribution Awards to non-employee directors Awards to non-employee directors [Member] Awards to non-employee directors [Member] Project percentage of ownership by third party Project Percentage Of Ownership By Third Party Project Percentage Of Ownership By Third Party Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Base rate increase - liquefied natural gas facility Base Rate Increase - liquefied natural gas facility Base Rate Increase - liquefied natural gas facility Other Commitment Other Commitment Credit Facility [Axis] Credit Facility [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Total assets Assets, Fair Value Disclosure Total Long-term debt Long-Term Debt and Lease Obligation Receivables and other deferred charges Receivables And Other Deferred Charges Receivables and other deferred charges Name Measure Name Deferred Credits and Other Liabilities Deferred Revenue, Noncurrent [Abstract] Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Other businesses and eliminations Other Operating Segment [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Increase (decrease) in contract assets (current) Increase (Decrease) in Other Current Assets Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Additional Paid-In Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category 2.46% note, due September 2031 Equipment Security Note [Member] Equipment Security Note Incremental rate case recovery Incremental Rate Case Recovery Incremental Rate Case Recovery FCG rate case percent FCG Rate Case Percent FCG Rate Case Percent Name Trading Arrangement, Individual Name Unrecognized compensation expense related to the awards to non-employee directors Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Cash and cash equivalents Cash and Cash Equivalent Energy transmission Energy Transmission [Member] Energy Transmission [Member] Company Selected Measure Amount Company Selected Measure Amount Expired Share-Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other Than Options, Expirations in Period, Weighted Average Grant Date Fair Value Share based compensation arrangement by share based payment award equity instruments other than options expirations weighted average grant date fair value. East Coast Reinforcement Projects: Boynton Beach East Coast Reinforcement Projects: Boynton Beach [Member] East Coast Reinforcement Projects: Boynton Beach Short-Term Borrowings Short-Term Debt [Text Block] Equity Method Investments and Joint Ventures [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Share-based compensation and tax benefit (shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Retirement Plan Name [Axis] Retirement Plan Name [Axis] Other inventory, at average cost Other Inventory, At Average Cost Other Inventory, At Average Cost Current Assets Assets, Current [Abstract] Derivative liabilities Derivative Liability Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Vested Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Income taxes Income Tax Expense (Benefit) Other RNG Other RNG [Member] Other RNG 3.48% notes, due May 2038 Uncollateralized Senior Notes Due May 31, Two Thousand Thirty Eight [Member] Uncollateralized Senior Notes Due May 31, Two Thousand Thirty Eight Award Timing Method Award Timing Method [Text Block] Net Decrease in Cash and Cash Equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Depreciation and accretion included in other costs Depreciation And Accretion Included In Other Costs Depreciation and accretion included in other costs Florida City Gas Florida City Gas [Member] Florida City Gas CNG / RNG Services Energy Services [Member] Energy Services [Member] Recently Adopted Accounting Standards and Recent Accounting Standards Yet to be Adopted Accounting Standards Update and Change in Accounting Principle [Text Block] AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Net Income Net Income Net income Net Income (Loss) Attributable to Parent Derivative assets, at fair value Energy Marketing Contracts Assets, Current Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Less: debt issuance costs Unamortized Debt Issuance Expense Total investments Investments [Member] Statement [Table] Statement [Table] Restatement Determination Date: Restatement Determination Date [Axis] Regulatory liabilities Regulatory Liability, Current Changes in Accumulated Other Comprehensive Loss Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] MGP sites with ongoing remediation MGP Sites With Ongoing Remediation MGP Sites With Ongoing Remediation Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Guarantee Obligations, Current Carrying Value, Subsidiaries Guarantee Obligations, Current Carrying Value, Subsidiaries Guarantee Obligations, Current Carrying Value, Subsidiaries Specific Purpose Specific Purpose [Member] Specific Purpose Number of miles of distribution mains Number of Miles of Distribution Mains Number of Miles of Distribution Mains Contract with Customer, Asset and Liability Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Annual rate case recovery Annual Rate Case Recovery Annual Rate Case Recovery Increase (decrease) in trade receivables Increase (Decrease) in Receivables Delaware natural gas distribution Delaware Natural Gas Division [Member] Delaware natural gas division [Member] Storage gas prepayments Energy Related Inventory, Natural Gas in Storage Net borrowings (repayments) under line of credit agreements Proceeds from (Repayments of) Lines of Credit Operating Revenues Revenues [Abstract] Awards to key employees Award to key employees [Member] Award to key employees [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract]