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Risk Management and Derivatives: Cash Flow Hedges (Details) - Cash Flow Hedging - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Interest rate swaps      
Derivative [Line Items]      
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months $ 5.9    
Designated as Hedging Instrument      
Derivative [Line Items]      
Unrealized Gain (Loss) on Cash Flow Hedging Instruments 1.3 $ (0.7) $ 4.8
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net $ (5.9) $ (0.1) $ (0.8)
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration] Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest
Designated as Hedging Instrument | Interest rate swaps      
Derivative [Line Items]      
Unrealized Gain (Loss) on Cash Flow Hedging Instruments $ 2.9 $ 2.8 $ 2.8
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion $ (2.9) $ (2.8) $ (2.9)
Derivative Instrument, Loss Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration] Interest Costs Incurred Interest Costs Incurred Interest Costs Incurred
Designated as Hedging Instrument | Commodity Contract      
Derivative [Line Items]      
Unrealized Gain (Loss) on Cash Flow Hedging Instruments $ (1.6) $ (3.5) $ 2.0
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion $ 3.0 $ 2.7 $ 2.1
Derivative Instrument, Gain Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration] Fuel, Purchased Power and Cost of Gas Sold Fuel, Purchased Power and Cost of Gas Sold Fuel, Purchased Power and Cost of Gas Sold