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Fair Value Measurements: Schedule of Fair Values (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Derivative Liability, Current Derivative Liability, Current
Contract Subject to Master Netting    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Fair Value, Gross Asset   $ 1.9
Derivative Liability, Fair Value, Gross Liability   3.3
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset $ 0.0 (1.9)
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset 0.0 (3.3)
Fair Value, Measurements, Recurring | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, Fair Value Disclosure 0.0 0.0
Derivative, Liabilities, Fair Value Disclosure 2.1 6.8
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, Fair Value Disclosure 0.0 0.0
Derivative, Liabilities, Fair Value Disclosure 0.0 0.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, Fair Value Disclosure 0.0 1.9
Derivative, Liabilities, Fair Value Disclosure 2.1 10.1
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, Fair Value Disclosure 0.0 0.0
Derivative, Liabilities, Fair Value Disclosure 0.0 0.0
Fair Value, Measurements, Recurring | Gas Utilities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset   (1.9)
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset   (3.3)
Fair Value, Measurements, Recurring | Gas Utilities | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, Fair Value Disclosure 0.0 0.0
Derivative, Liabilities, Fair Value Disclosure 2.1 6.8
Fair Value, Measurements, Recurring | Gas Utilities | Fair Value, Inputs, Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, Fair Value Disclosure 0.0 0.0
Derivative, Liabilities, Fair Value Disclosure 0.0 0.0
Fair Value, Measurements, Recurring | Gas Utilities | Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, Fair Value Disclosure 0.0 1.9
Derivative, Liabilities, Fair Value Disclosure 2.1 10.1
Fair Value, Measurements, Recurring | Gas Utilities | Fair Value, Inputs, Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets, Fair Value Disclosure 0.0 0.0
Derivative, Liabilities, Fair Value Disclosure $ 0.0 $ 0.0