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Regulatory Matters - Ohio (Details) - USD ($) $ in Millions |  |  |  |  |  |  |  |  | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 09, 2019 | Oct. 01, 2019 | Apr. 19, 2019 | Mar. 29, 2019 | Nov. 09, 2018 | Mar. 12, 2018 | Dec. 01, 2017 | Jun. 01, 2016 | Sep. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Feb. 15, 2018
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proposed goal to reduce CO2 pollution (percent) |  |  |  |  |  |  |  |  | 90.00% |  |  |
OHIO |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated cost of plans |  |  |  |  |  |  |  |  | $ 268.0 |  |  |
OHIO | PUCO |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proposed goal to reduce CO2 pollution (percent) |  |  |  |  |  |  |  | 90.00% |  |  |  |
Requested removal of cost cap |  |  |  |  |  | 4.00% |  |  |  |  |  |
OHIO | Distribution Modernization Rider | PUCO |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Annual revenue cap for rider |  |  |  |  |  |  |  |  |  |  | $ 132.5 |
Recovery period |  |  |  |  |  |  |  |  |  |  | 3 years |
Approved amount for rider |  |  |  |  |  |  |  |  |  | $ 168.0 |  |
OHIO | Distribution Modernization Rider | PUCO | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved amount of annual increase (decrease) |  | $ (28.0) |  |  |  |  |  |  |  |  |  |
OHIO | Delivery Capital Recovery Rider | PUCO |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Annual revenue cap for rider for years three through six |  |  |  |  |  |  |  | $ 20.0 |  |  |  |
Annual revenue cap for rider for years six through eight |  |  |  |  |  |  |  | 15.0 |  |  |  |
OHIO | Distribution Platform Modernization Plan | PUCO |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amount of requested rate increase (decrease) |  |  |  |  |  |  | $ 450.0 |  |  |  |  |
Approved amount of annual increase (decrease) |  |  |  |  | $ 516.0 |  |  |  |  |  |  |
Period of grid modernization plan |  |  |  |  | 3 years |  |  |  |  |  |  |
OHIO | Energy Conservation, Economic Development and Job Retention | PUCO |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contribution amount |  |  |  |  |  |  |  | $ 51.0 |  |  |  |
The Ohio Companies | OHIO | PUCO |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impact on base rate |  |  |  |  |  |  |  |  |  |  |  | $ 40.0
The Ohio Companies | OHIO | Regional Transmission Expansion Plan | PUCO |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amount excluded from approved rate recovery |  |  |  | $ 95.0 |  |  |  |  |  |  |  |
The Ohio Companies | OHIO | Regional Transmission Expansion Plan | PUCO | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved amount of annual increase (decrease) | $ 95.0 |  |  |  |  |  |  |  |  |  |  |
The Ohio Companies | OHIO | OCC DMR Refund | PUCO |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, damages sought |  |  | $ 42.0 |  |  |  |  |  |  |  |  |

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