v3.26.1
Derivative Instruments and Hedging Activities, Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Derivatives, Fair Value [Line Items]    
Derivative assets $ 137.1 $ 189.7
Derivative assets 75.5 154.7
Derivative assets 61.6 35.0
Derivative liabilities (262.7) (256.6)
Derivative liabilities (113.2) (234.1)
Derivative liabilities (149.5) (22.5)
Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 123.3 163.2
Derivative liabilities (33.3) (21.7)
Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Assets from Risk Management Activities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 11.2 17.6
Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Other Long-term Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 2.6 8.9
Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Liabilities from Risk Management Activities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities (93.2) (219.3)
Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Long-term Position [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities (136.2) (15.6)
Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 13.8 26.5
Derivative liabilities (229.4) (234.9)
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Assets from Risk Management Activities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 64.3 137.1
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Other Long-term Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 59.0 26.1
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Liabilities from Risk Management Activities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities (20.0) (14.8)
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Long-term Position [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities $ (13.3) $ (6.9)