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Derivative Instruments and Hedging Activities, Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Derivatives, Fair Value [Line Items]    
Derivative assets $ 101.3 $ 50.8
Derivative assets 80.8 43.1
Derivative assets 20.5 7.7
Derivative liabilities (657.8) (367.5)
Derivative liabilities (425.5) (258.2)
Derivative liabilities (232.3) (109.3)
Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 91.5 31.7
Derivative liabilities (453.8) (336.9)
Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Assets from Risk Management Activities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 72.9 25.5
Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Long-Term Assets from Risk Management Activities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 18.6 6.2
Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Liabilities from Risk Management Activities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities (335.9) (252.6)
Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Long-term Position [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities (117.9) (84.3)
Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 9.8 19.1
Derivative liabilities (204.0) (30.6)
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Assets from Risk Management Activities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 7.9 17.6
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Long-Term Assets from Risk Management Activities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 1.9 1.5
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Liabilities from Risk Management Activities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities (89.6) (5.6)
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Long-term Position [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities $ (114.4) $ (25.0)