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Regulatory Matters: Gas Utilities Regulatory Activity (Details) $ in Millions					3 Months Ended
	Jan. 17, 2024 USD ($)	Dec. 04, 2023 USD ($) mi	Jul. 12, 2023 USD ($)	Jan. 26, 2023 USD ($)	Dec. 31, 2023 USD ($)	May 18, 2023 mi	May 09, 2023 mi	Jun. 01, 2022 mi
Colorado Public Utilities Commission (CPUC) | Rocky Mountain Natural Gas | Settlement Reached with the Regulatory Agency
Public Utilities, General Disclosures [Line Items]
Public Utilities Amount of System Safety and Integrity Rider Moved to Base Rates and Termination of the System Safety and Integrity Rider			$ 8.3
Public Utilities, Approved Rate Increase (Decrease), Amount			$ 8.2
Weighted average cost of capital			6.93%
Colorado Public Utilities Commission (CPUC) | Rocky Mountain Natural Gas | Settlement Reached with the Regulatory Agency | Minimum
Public Utilities, General Disclosures [Line Items]
Public Utilities, Approved Equity Capital Structure, Percentage			50.00%
Public Utilities, Approved Debt Capital Structure, Percentage			50.00%
Public Utilities, Approved Return on Equity, Percentage			9.50%
Colorado Public Utilities Commission (CPUC) | Rocky Mountain Natural Gas | Settlement Reached with the Regulatory Agency | Maximum
Public Utilities, General Disclosures [Line Items]
Public Utilities, Approved Equity Capital Structure, Percentage			52.00%
Public Utilities, Approved Debt Capital Structure, Percentage			48.00%
Public Utilities, Approved Return on Equity, Percentage			9.70%
Colorado Public Utilities Commission (CPUC) | Black Hills Energy - Colorado Gas | Settlement Agreement Reached with the CPUC Staff and Various Intervenors for a General Rate Increase which is Subject to CPUC Approval
Public Utilities, General Disclosures [Line Items]
Public Utilities - Length of Natural Gas Pipeline to Receive Infrastructure Investments | mi							10,000
Public Utilities, Approved Equity Capital Structure, Percentage					50.87%
Public Utilities, Approved Debt Capital Structure, Percentage					49.13%
Public Utilities, Approved Return on Equity, Percentage					9.30%
Public Utilities, Approved Rate Increase (Decrease), Amount					$ 20.2
Arkansas Public Service Commission | Black Hills Energy - Arkansas Gas | Rate Review Filed with the Regulatory Agency
Public Utilities, General Disclosures [Line Items]
Public Utilities - Length of Natural Gas Pipeline to Receive Infrastructure Investments | mi		7,200
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 44.1
Arkansas Public Service Commission | Black Hills Energy - Arkansas Gas | Settlement agreement reached with APSC Staff and various intervenors
Public Utilities, General Disclosures [Line Items]
Public Utilities, Approved Equity Capital Structure, Percentage		48.00%
Public Utilities, Approved Debt Capital Structure, Percentage		52.00%
Public Utilities, Requested Return on Equity, Percentage		10.50%
Wyoming Public Service Commission | Wyoming Electric | Rate Review Approved by Regulatory Agency
Public Utilities, General Disclosures [Line Items]
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
Public Utilities, Approved Equity Capital Structure, Percentage				52.00%
Public Utilities, Approved Debt Capital Structure, Percentage				48.00%
Public Utilities, Approved Return on Equity, Percentage				9.75%
Public Utilities, Approved Rate Increase (Decrease), Amount				$ 8.7
Wyoming Public Service Commission | Black Hills Energy - Wyoming Gas | WPSC Approved a Settlement Agreement for a General Rate Increase
Public Utilities, General Disclosures [Line Items]
Public Utilities - Length of Natural Gas Pipeline to Receive Infrastructure Investments | mi						6,400
Subsequent Event | Wyoming Public Service Commission | Black Hills Energy - Wyoming Gas | WPSC Approved a Settlement Agreement for a General Rate Increase
Public Utilities, General Disclosures [Line Items]
Public Utilities, Approved Equity Capital Structure, Percentage	51.00%
Public Utilities, Approved Debt Capital Structure, Percentage	49.00%
Public Utilities, Approved Return on Equity, Percentage	9.85%
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 13.9
Extension period as per settlement agreement	4 years

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