v3.26.3
Derivative Instruments and Hedging Activities, Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Derivatives, Fair Value [Line Items]    
Derivative assets $ 100.2 $ 189.7
Derivative assets 61.0 154.7
Derivative assets 39.2 35.0
Derivative liabilities (372.7) (256.6)
Derivative liabilities (206.9) (234.1)
Derivative liabilities (165.8) (22.5)
Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 80.0 163.2
Derivative liabilities (199.9) (21.7)
Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Location, Statement of Financial Position, Balance [Axis]: us-gaap:LiabilitiesCurrent    
Derivatives, Fair Value [Line Items]    
Derivative liabilities (136.2) (14.8)
Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsCurrent    
Derivatives, Fair Value [Line Items]    
Derivative assets 46.6 137.1
Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsNoncurrent    
Derivatives, Fair Value [Line Items]    
Derivative assets 33.4 26.1
Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherLiabilitiesNoncurrent    
Derivatives, Fair Value [Line Items]    
Derivative liabilities (63.7) (6.9)
Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 20.2 26.5
Derivative liabilities (172.8) (234.9)
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Location, Statement of Financial Position, Balance [Axis]: us-gaap:LiabilitiesCurrent    
Derivatives, Fair Value [Line Items]    
Derivative liabilities (70.7) (219.3)
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsCurrent    
Derivatives, Fair Value [Line Items]    
Derivative assets 14.4 17.6
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsNoncurrent    
Derivatives, Fair Value [Line Items]    
Derivative assets 5.8 8.9
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherLiabilitiesNoncurrent    
Derivatives, Fair Value [Line Items]    
Derivative liabilities $ (102.1) $ (15.6)