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Electric utility segment - Regulatory Proceedings (Details) |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Mar. 25, 2019 contract | Apr. 27, 2017 USD ($) | Feb. 28, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) $ / kWh
Electric utility subsidiary [Abstract] |  |  |  |  |
MPIR requested amount |  | $ 3,600,000 | $ 19,800,000 |  |
Decoupling order, service reliability performance, historical measurement period (in years) |  |  |  | 10 years |
Maximum penalty, percent of ROE |  |  |  |  | 0.20%
Service reliability, pending adjusted maximum penalty amount |  |  |  | $ 6,700,000 |
Dead band percentage above or below the target |  |  |  | 3.00% |
Call center performance, maximum penalty percentage |  |  |  |  | 0.08%
Call center performance, pending adjusted maximum penalty |  |  |  | $ 1,300,000 |
Call center performance, maximum penalty amount |  |  |  | 2,100,000 |
Energy price, renewable projects with storage capacity (in dollars per kilowatt hour) | $ / kWh |  |  |  |  | 0.115
Energy price, renewable energy-only projects (in dollars per kilowatt hour) | $ / kWh |  |  |  |  | 0.095
Expected savings, phase 1, percent |  |  |  |  | 20.00%
Performance incentive mechanism, incentive cap |  |  |  | 3,000,000 | $ 3,500,000
Expected savings, Phase 2, January 2019 |  |  |  |  | 15.00%
Expected savings, Phase 2, February 2019 |  |  |  |  | 10.00%
Expected savings, Phase 2, March 2019 |  |  |  |  | 5.00%
Performance incentive mechanism penalty |  |  |  |  | $ 0
Number of contracts which qualified for incentives under Phase 1 | contract | 6 |  |  |  |
Incentives accrued |  |  |  | $ 1,700,000 |

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