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Regulatory Matters: Rate Review (Details) $ in Millions | Oct. 10, 2022 USD ($) riders | Oct. 07, 2022 USD ($) mi | Jun. 01, 2022 USD ($) mi | Dec. 10, 2021 mi
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Rate Review Filed with the Regulatory Agency | Arkansas Public Service Commission | Black Hills Energy, Arkansas |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Public Utilities, Length of Natural Gas Pipeline to Receive Infrastructure Investments | mi |  |  |  | 7,200
Rate Review Filed with the Regulatory Agency | Colorado Public Utilities Commission | Rocky Mountain Natural Gas | Subsequent Event |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Public Utilities, Length of Natural Gas Pipeline to Receive Infrastructure Investments | mi |  | 600 |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  | $ 12.3 |  |
Public Utilities, Requested Equity Capital Structure, Percentage |  | 52.00% |  |
Public Utilities, Requested Debt Capital Structure, Percentage |  | 48.00% |  |
Public Utilities, Requested Return on Equity, Percentage |  | 12.30% |  |
Public Utilities, Amount of Requested System Safety and Integrity Rider be Moved to Base Rates |  | $ 7.7 |  |
Rate Review Filed with the Regulatory Agency | Wyoming Public Service Commission | Wyoming Electric |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  | $ 15.0 |
Public Utilities, Requested Equity Capital Structure, Percentage |  |  | 54.00% |
Public Utilities, Requested Debt Capital Structure, Percentage |  |  | 46.00% |
Public Utilities, Requested Return on Equity, Percentage |  |  | 10.30% |
Public Utilities, Length of Electric Distribution Lines to Receive Infrastructure Investments | mi |  |  | 1,330 |
Public Utilities, Length of Electric Transmission Lines to Receive Infrastructure Investments | mi |  |  | 59 |
Settlement agreement reached with APSC Staff and various intervenors | Arkansas Public Service Commission | Black Hills Energy, Arkansas | Subsequent Event |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Public Utilities, Approved Equity Capital Structure, Percentage | 45.00% |  |  |
Public Utilities, Approved Debt Capital Structure, Percentage | 55.00% |  |  |
Public Utilities, Approved Return on Equity, Percentage | 9.60% |  |  |
Public Utilities, Amount of System Safety and Integrity Rider Moved to Base Rates | $ 10.0 |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | $ 8.8 |  |  |
Public Utilities, Number of Former Riders Replaced with a New Comprehensive Safety and Integrity Rider | riders | 3 |  |  |

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