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Organization and Basis of Presentation (Details Textuals) customer in Millions, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2019 USD ($) customer transmission_center company mi MW | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) MW | Dec. 31, 2018 USD ($) MW | Apr. 11, 2019 USD ($) | Jan. 01, 2019 USD ($) | Sep. 26, 2018 USD ($) | Aug. 31, 2017 MW
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Length of transmission lines | mi | 24,500 |  |  |  |  |  |  |
Number of regional transmission centers | transmission_center | 2 |  |  |  |  |  |  |
Cash payment |  |  |  |  |  |  | $ 225.0 |
Capitalized cost of equity | $ 13.0 | $ 11.0 |  |  |  |  |  |
Capitalized interest | $ 5.0 | 4.0 |  |  |  |  |  |
Regulated Distribution |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Number of existing utility operating companies | company | 10 |  |  |  |  |  |  |
Number of customers served by utility operating companies | customer | 6 |  |  |  |  |  |  |
Plant capacity (in MW's) | MW | 3,790 |  |  |  |  |  |  |
Purchase Agreement with Subsidiary of LS Power |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Plant capacity (in MW's) | MW |  |  |  |  |  |  |  | 1,615
Discontinued Operations, Disposed of by Means Other than Sale | FES and FENOC |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Fair value of investments | $ 0.0 | 0.0 |  |  |  |  |  |
Terms of settlement agreement |  |  |  | $ 66.0 |  |  |  |
Estimated tax payments that have been made |  |  |  | $ 52.0 |  |  |  |
Income (Loss) from discontinued operations, before tax | $ 3.0 | $ (3.0) |  |  |  |  |  |
Discontinued Operations, Disposed of by Means Other than Sale | FES and FENOC | Tax Year 2017 |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Overpayment of NOL's waived |  |  |  |  |  |  | 71.0 |
Discontinued Operations, Disposed of by Means Other than Sale | FES and FENOC | Tax Year 2018 |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Overpayment of NOL's waived |  |  |  |  |  |  | 88.0 |
Loans Payable | Intercompany Income Tax Allocation Agreement | FES |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  | 628.0 |
Line of Credit | Secured Credit Facility | FES |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Maximum amount borrowed under revolving credit facility |  |  |  |  |  |  | 500.0 |
Line of Credit | Credit Agreement | FES |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Maximum amount borrowed under revolving credit facility |  |  |  |  |  |  | $ 200.0 |
Pleasants Power Station | Purchase Agreement with Subsidiary of LS Power | AE Supply |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Plant capacity (in MW's) | MW | 1,300 |  | 1,300 | 1,300 |  |  |  |
Affiliated Companies | Services Agreements | Discontinued Operations, Disposed of by Means Other than Sale | FES and FENOC | FES |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Amounts of transaction | $ 35.0 |  | $ 112.5 |  |  |  |  |
Affiliated Companies | Pension Plan Enhancement | Discontinued Operations, Disposed of by Means Other than Sale | FES and FENOC |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Amounts of transaction | 15.0 |  |  |  |  |  |  |
Affiliated Companies | Benefit Obligations | Discontinued Operations, Disposed of by Means Other than Sale | FES and FENOC |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Income (Loss) from discontinued operations, before tax | 27.0 |  |  |  |  |  |  |
Assets | Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Effect of new accounting principle in period of adoption |  |  |  |  |  | $ 186.0 |  |
Liabilities, Total | Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Effect of new accounting principle in period of adoption |  |  |  |  |  | $ 186.0 |  |
Subsequent Event | Affiliated Companies | Benefit Obligations | Discontinued Operations, Disposed of by Means Other than Sale | FES and FENOC |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Obligations settled in cash |  |  |  |  | $ 60.0 |  |  |
Total obligations to be settled |  |  |  |  | $ 87.0 |  |  |
Continuing Operations | Affiliated Companies | Benefit Obligations | Discontinued Operations, Disposed of by Means Other than Sale | FES and FENOC |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Income (Loss) from discontinued operations, before tax | $ 17.0 |  |  |  |  |  |  |

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