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Share-based Compensation Plans: Performance Share Units-Market Condition (Details)
12 Months Ended
Dec. 31, 2021
$ / shares
Performance Share Units - Market Condition  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share Based Compensation Arrangement By Share Based Payment Award - Performance Period Used to Estimate Expected Share Payout 3 years
Performance Shares  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted (usd per share) $ 64.97
Three-year risk-free rate 0.17%
Black Hills Corporation’s common stock volatility 33.00%
Volatility range for peer group, Minimum 25.00%
Volatility range for the peer group, Maximum 76.00%
Performance Shares | Performance Share Units - Market Condition  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted (usd per share) $ 64.97