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Derivative Instruments and Hedging Activities - Pro Forma Impact Of Offsetting Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Derivative Asset [Abstract]    
Gross asset $ 101.3 $ 50.8
Gross asset 101.3 50.8
Pro forma net presentation, asset, total 8.1 4.5
Counterparties with Offsetting Positions or Collateral [Member]    
Derivative Asset [Abstract]    
Gross asset 96.4 46.6
Pro forma net presentation, asset 3.2 0.3
Counterparties without Offsetting Position [Member]    
Derivative Asset [Abstract]    
Gross asset 4.9 4.2
Pro forma net presentation, asset, total 4.9 4.2
Current Assets from Risk Management Activities [Member]    
Derivative Asset [Abstract]    
Gross asset 80.8 43.1
Pro forma net presentation, asset, current 5.0 4.2
Current Assets from Risk Management Activities [Member] | Counterparties with Offsetting Positions or Collateral [Member]    
Derivative Asset [Abstract]    
Gross asset 78.9 39.2
Pro forma net presentation, asset 3.1 0.3
Current Assets from Risk Management Activities [Member] | Counterparties without Offsetting Position [Member]    
Derivative Asset [Abstract]    
Gross asset 1.9 3.9
Pro forma net presentation, asset, current 1.9 3.9
Long-Term Assets from Risk Management Activities [Member]    
Derivative Asset [Abstract]    
Gross asset 20.5 7.7
Pro forma net presentation, asset, noncurrent 3.1 0.3
Long-Term Assets from Risk Management Activities [Member] | Counterparties with Offsetting Positions or Collateral [Member]    
Derivative Asset [Abstract]    
Gross asset 17.5 7.4
Pro forma net presentation, asset 0.1  
Long-Term Assets from Risk Management Activities [Member] | Counterparties without Offsetting Position [Member]    
Derivative Asset [Abstract]    
Gross asset 3.0 0.3
Pro forma net presentation, asset, noncurrent $ 3.0 $ 0.3