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Financing: Long-Term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Debt Instrument [Line Items]    
Total long-term debt $ 4,426.0 $ 4,154.6
Less current maturities (600.0) (525.0)
Less unamortized deferred financing costs (24.8) (22.3)
Long-term debt, net of current maturities 3,801.2 3,607.3
Revolving Credit Facility    
Debt Instrument [Line Items]    
Less unamortized deferred financing costs (1.1) (1.8)
Black Hills Corporation | Corporate, Non-Segment    
Debt Instrument [Line Items]    
Long-term debt 3,900.0 3,625.0
Less unamortized debt discount (8.9) (5.3)
Total long-term debt $ 3,891.1 3,619.7
Black Hills Corporation | Corporate, Non-Segment | Senior Unsecured Notes Due 2023    
Debt Instrument [Line Items]    
Long-term debt   525.0
Black Hills Corporation | Corporate, Non-Segment | Senior Unsecured Notes Due 2024    
Debt Instrument [Line Items]    
Stated interest rate (percent) 1.04%  
Long-term debt $ 600.0 600.0
Black Hills Corporation | Corporate, Non-Segment | Senior Unsecured Notes Due 2026    
Debt Instrument [Line Items]    
Stated interest rate (percent) 3.95%  
Long-term debt $ 300.0 300.0
Black Hills Corporation | Corporate, Non-Segment | Senior Unsecured Notes Due 2027    
Debt Instrument [Line Items]    
Stated interest rate (percent) 3.15%  
Long-term debt $ 400.0 400.0
Black Hills Corporation | Corporate, Non-Segment | Senior Unsecured Notes Due 2028    
Debt Instrument [Line Items]    
Stated interest rate (percent) 5.95%  
Long-term debt $ 350.0  
Black Hills Corporation | Corporate, Non-Segment | Senior Unsecured Notes Due 2029    
Debt Instrument [Line Items]    
Stated interest rate (percent) 3.05%  
Long-term debt $ 400.0 400.0
Black Hills Corporation | Corporate, Non-Segment | Senior Unsecured Notes Due 2030    
Debt Instrument [Line Items]    
Stated interest rate (percent) 2.50%  
Long-term debt $ 400.0 400.0
Black Hills Corporation | Corporate, Non-Segment | Senior Unsecured Notes Due 2033    
Debt Instrument [Line Items]    
Stated interest rate (percent) 4.35%  
Long-term debt $ 400.0 400.0
Black Hills Corporation | Corporate, Non-Segment | Senior Unsecured Notes Due 2034    
Debt Instrument [Line Items]    
Stated interest rate (percent) 6.15%  
Long-term debt $ 450.0  
Black Hills Corporation | Corporate, Non-Segment | Senior Unsecured Notes Due 2046    
Debt Instrument [Line Items]    
Stated interest rate (percent) 4.20%  
Long-term debt $ 300.0 300.0
Black Hills Corporation | Corporate, Non-Segment | Senior Unsecured Notes Due 2049    
Debt Instrument [Line Items]    
Stated interest rate (percent) 3.88%  
Long-term debt $ 300.0 300.0
Black Hills Energy - South Dakota Electric | Electric Utilities    
Debt Instrument [Line Items]    
Long-term debt 340.0 340.0
Less unamortized debt discount (0.1) (0.1)
Total long-term debt $ 339.9 339.9
Black Hills Energy - South Dakota Electric | Electric Utilities | First Mortgage Bonds Due 2032    
Debt Instrument [Line Items]    
Stated interest rate (percent) 7.23%  
Long-term debt $ 75.0 75.0
Black Hills Energy - South Dakota Electric | Electric Utilities | First Mortgage Bonds Due 2039    
Debt Instrument [Line Items]    
Stated interest rate (percent) 6.13%  
Long-term debt $ 180.0 180.0
Black Hills Energy - South Dakota Electric | Electric Utilities | First Mortgage Bonds Due 2044    
Debt Instrument [Line Items]    
Stated interest rate (percent) 4.43%  
Long-term debt $ 85.0 85.0
Wyoming Electric | Electric Utilities    
Debt Instrument [Line Items]    
Long-term debt 195.0 195.0
Total long-term debt 195.0 195.0
Wyoming Electric | Electric Utilities | Senior Unsecured Notes Due 2027    
Debt Instrument [Line Items]    
Long-term debt $ 10.0  
Wyoming Electric | Electric Utilities | First Mortgage Bonds Due 2044    
Debt Instrument [Line Items]    
Stated interest rate (percent) 4.53%  
Long-term debt $ 75.0 75.0
Wyoming Electric | Electric Utilities | Industrial Development Revenue Bonds Due 2027    
Debt Instrument [Line Items]    
Variable interest rate (percent) 3.93%  
Long-term debt $ 10.0 10.0
Wyoming Electric | Electric Utilities | First Mortgage Bonds Due 2037    
Debt Instrument [Line Items]    
Stated interest rate (percent) 6.67%  
Long-term debt $ 110.0 $ 110.0