Share-based Compensation Plans: Performance Share Units-Market Condition (Details) - $ / shares |
12 Months Ended | |
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Dec. 31, 2025 |
Dec. 31, 2024 |
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| 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) | $ 77.95 | $ 55.14 |
| Risk-free rate | 3.84% | 4.12% |
| Black Hills Corporation’s common stock volatility | 31.00% | 24.00% |
| Volatility range for peer group, Minimum | 24.00% | 12.00% |
| Volatility range for the peer group, Maximum | 39.00% | 53.00% |
| Performance Shares | Performance Share Units - Market Condition | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Granted (usd per share) | $ 62.16 | |
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- Definition Share Based Compensation Arrangement By Share Based Payment Award - Performance Period Used to Estimate Expected Share Payout No definition available.
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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