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Share-Based Compensation (Tables) - Performance Units [Member]
 12 Months Ended
Dec. 31, 2018
Director Incentive Agreement [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Performance Unit Graded Vesting Schedule

Units granted under the Director Incentive Plan are subject to a three-year vesting schedule. The most recent three years of units granted under this plan are as follows:

Grant DateMGE Energy Units Granted
January 18, 20195,175
March 1, 20181,106
January 19, 20184,704
January 20, 20174,608
Performance Unit Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Performance Unit Graded Vesting Schedule

Units granted under the Performance Unit Plan are subject to a five-year vesting schedule. The most recent units granted under this plan are as follows:

Grant DateMGE Energy Units Granted
February 15, 201917,022
February 16, 201817,830
March 1, 201714,704
February 19, 201619,055
February 20, 201518,948