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Electric utility segment - Regulatory Proceedings (Details) |  | 3 Months Ended | 9 Months Ended
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Apr. 27, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) $ / kWh
Electric utility subsidiary [Abstract] |  |  |
Threshold of capital expenditures in excess of customer contributions for qualification for major project interim recovery | $ 2,500,000.0 |  |
MPIR requested amount | $ 3,400,000 |  |
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
Demand response, award percentage of annual maintenance costs |  |  | 5.00%
Demand response, maximum award |  |  | $ 500,000
Demand response, penalty |  |  | $ 0
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 |  | $ 3,500,000.0 | $ 3,000,000
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

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