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Regulatory Matters - Ohio (Details) - USD ($) $ in Millions |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 15, 2019 | Nov. 09, 2018 | Jun. 01, 2016 | Mar. 31, 2020 | Dec. 31, 2018 | Dec. 31, 2017
Regulatory Matters [Line Items] |  |  |  |  |  |
Proposed goal to reduce CO2 pollution (percent) |  |  |  | 90.00% |  |
OHIO | PUCO |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Proposed goal to reduce CO2 pollution (percent) |  |  | 90.00% |  |  |
OHIO | PUCO | Energy Conservation, Economic Development and Job Retention |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Contribution amount |  |  | $ 51.0 |  |  |
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 | 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] |  |  |  |  |  |
Approved amount of annual increase (decrease) |  | $ 516.0 |  |  |  |
Period of grid modernization plan |  | 3 years |  |  |  |
The Ohio Companies | OHIO | OCC DMR Refund | PUCO |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Loss contingency, damages sought | $ 42.0 |  |  |  |  |

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