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Organization and Basis of Presentation (Details Textuals) customer in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) transmission_center company MW | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) customer transmission_center company mi MW | Jun. 30, 2017 USD ($) | Jul. 30, 2018 USD ($) | Jan. 01, 2018 USD ($) | Dec. 31, 2017 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Length of transmission lines | mi |  |  | 24,500 |  |  |  |
Number of regional transmission centers | transmission_center | 2 |  | 2 |  |  |  |
Capitalized cost of equity | $ 12.0 | $ 9.0 | $ 23.0 | $ 17.0 |  |  |
Capitalized interest | $ 4.0 | 5.0 | $ 8.0 | 9.0 |  |  |
Accounting Standards Update 2018-02 | Retained Earnings |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Cumulative effect of new accounting principle |  |  |  |  |  | $ 22.0 |
Regulated Distribution |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Number of existing utility operating companies | company | 10 |  | 10 |  |  |  |
Number of customers served by utility operating companies | customer |  |  | 6 |  |  |  |
Plant capacity (in MW's) | MW | 3,790 |  | 3,790 |  |  |  |
FES | Accounting Standards Update 2016-01 | Retained Earnings |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Cumulative effect of new accounting principle |  |  |  |  |  |  | $ 115.0
FES and FENOC | Accounting Standards Update 2018-02 | Retained Earnings |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Cumulative effect of new accounting principle |  |  |  |  |  | $ 8.0 |
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 |  |  |  |
Gain on deconsolidation, net of tax | 0.0 | $ 0.0 | 1,239.0 | $ 0.0 |  |  |
Discontinued Operations, Disposed of by Means Other than Sale | FES and FENOC | Subsequent Event |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Cash payment to settle claims |  |  |  |  | $ 225.0 |  |
Shared service costs |  |  |  |  | 112.5 |  |
Pension voluntary enhanced retirement |  |  |  |  | 15.0 |  |
Other employee benefits |  |  |  |  | 3.0 |  |
Other Operating Expense | Accounting Standards Update 2017-07 |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Effect of change on net income | (8.0) |  | (16.0) |  |  |  |
Miscellaneous Income | Accounting Standards Update 2017-07 |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Effect of change on net income | $ 8.0 |  | $ 16.0 |  |  |  |
Corporate/Other |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Plant capacity (in MW's) | MW | 1,367 |  | 1,367 |  |  |  |
Promissory Notes | Discontinued Operations, Disposed of by Means Other than Sale | FES and FENOC | Subsequent Event |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Face amount of debt |  |  |  |  | 628.0 |  |
Line of Credit | Discontinued Operations, Disposed of by Means Other than Sale | FES and FENOC | Revolving Credit Facility | Subsequent Event |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Face amount of debt |  |  |  |  | 500.0 |  |
Line of Credit | Discontinued Operations, Disposed of by Means Other than Sale | FES and FENOC | Surety Bond | Subsequent Event |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Face amount of debt |  |  |  |  | $ 200.0 |  |

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