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Summary of Significant Accounting Policies Operating Revenues (Details) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Aug. 31, 2018 MW | Dec. 31, 2018 USD ($) contract performance_obligations | Oct. 19, 2018
Bishop Hill III Wind Energy Center |  |  |
Disaggregation of Operating Revenues |  |  |
WEC's ownership interest in Bishop Hill III Wind Energy Center | 80.00% |  |
Capacity of Bishop Hill III Wind Energy Center | MW | 132 |  |
Additional Ownership Interest in Bishop Hill III Wind Energy Center |  | 10.00% |
Duration of offtake agreement for the sale of energy produced | 22 years |  |
Electric |  |  |
Disaggregation of Operating Revenues |  |  |
Number of performance obligations |  | 1 |
Percent fuel costs can vary from the rate case approved costs before deferral is required |  | 2.00% |
Number of days payment is due |  | 30 days |
Electric | Wholesale |  |  |
Disaggregation of Operating Revenues |  |  |
Number of performance obligations |  | 2 |
Number of contracts | contract |  | 1 |
Natural gas |  |  |
Disaggregation of Operating Revenues |  |  |
Number of days payment is due |  | 30 days |
Other non-utility revenues | Bishop Hill III Wind Energy Center |  |  |
Disaggregation of Operating Revenues |  |  |
Number of performance obligations |  | 1 |
WEC's ownership interest in Bishop Hill III Wind Energy Center | 80.00% |  |
Capacity of Bishop Hill III Wind Energy Center | MW | 132 |  |
Additional Ownership Interest in Bishop Hill III Wind Energy Center |  |  | 10.00%
Duration of offtake agreement for the sale of energy produced | 22 years |  |
Other non-utility revenues | We Power revenues |  |  |
Disaggregation of Operating Revenues |  |  |
Revenues amortized from deferred revenue during the period | $ |  | $ 25.3 |
Other non-utility revenues | Appliance service repairs | Maximum |  |  |
Disaggregation of Operating Revenues |  |  |
Duration of contract for remaining performance obligations in contract |  | 1 year |

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