v3.26.1
Derivative Instruments and Hedging Activities, Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Derivatives, Fair Value [Line Items]    
Derivative assets $ 139.1 $ 189.7
Derivative assets 100.6 154.7
Derivative assets 38.5 35.0
Derivative liabilities (480.9) (256.6)
Derivative liabilities (368.1) (234.1)
Derivative liabilities (112.8) (22.5)
Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 118.2 163.2
Derivative liabilities (141.2) (21.7)
Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Assets from Risk Management Activities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 17.2 17.6
Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Other Long-term Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 3.7 8.9
Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Liabilities from Risk Management Activities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities (253.1) (219.3)
Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Long-term Position [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities (86.6) (15.6)
Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 20.9 26.5
Derivative liabilities (339.7) (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 83.4 137.1
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Other Long-term Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 34.8 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 (115.0) (14.8)
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Long-term Position [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities $ (26.2) $ (6.9)