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Regulatory Matters - Ohio (Details) - USD ($) $ in Millions |  |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 09, 2019 | Oct. 01, 2019 | Jul. 15, 2019 | Nov. 09, 2018 | Mar. 12, 2018 | Oct. 12, 2016 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2018
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |
Proposed reduction in power plants carbon pollution (percent) |  |  |  |  |  |  | 90.00% |  |  |
Ohio |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |
Portfolio plan estimated cost |  |  |  |  |  |  |  |  |  | $ 268.0
Ohio | PUCO |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |
Proposed reduction in power plants carbon pollution (percent) |  |  |  |  |  | 90.00% |  |  |  |
Requested removal of cost cap |  |  |  |  | 4.00% |  |  |  |  |
Ohio | PUCO | DMR |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |
Annual revenue cap for rider |  |  |  |  |  |  |  |  | $ 132.5 |
Cost recovery period |  |  |  |  |  |  |  |  | 3 years |
Approved annual revenue cap for rider |  |  |  |  |  |  |  | $ 168.0 |  |
Approved amount of rate increase |  | $ (28.0) |  |  |  |  |  |  |  |
Ohio | PUCO | DCR Rider |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |
Revenue cap for Rider for years 3-6 |  |  |  |  |  | $ 20.0 |  |  |  |
Revenue cap for Rider for years 6-8 |  |  |  |  |  | 15.0 |  |  |  |
Ohio | PUCO | DPM Plan |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |
Approved amount of rate increase |  |  |  | $ 516.0 |  |  |  |  |  |
Grid modernization plan period |  |  |  | 3 years |  |  |  |  |  |
Ohio | PUCO | Energy Conservation, Economic Development and Job Retention |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |
Contribution amount |  |  |  |  |  | $ 51.0 |  |  |  |
Ohio Companies | Ohio | PUCO | Ohio Consumers Counsel DMR Refund |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |
Amount of damages sought |  |  | $ 42.0 |  |  |  |  |  |  |
Ohio Companies | Ohio | PUCO | RTEP |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |
Approved amount of rate increase | $ 95.0 |  |  |  |  |  |  |  |  |

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