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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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