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Derivative Instruments and Hedging Activities - Pro Forma Impact Of Offsetting Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Derivative Asset [Abstract]    
Derivative assets $ 101.9 $ 204.4
Pro forma net presentation, asset, current $ 26.6 $ 44.9
Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration] Assets from risk management activities Assets from risk management activities
Pro forma net presentation, asset, noncurrent $ 2.1 $ 7.3
Derivative Asset, Noncurrent, Statement of Financial Position [Extensible Enumeration] Long-term assets from risk management activities Long-term assets from risk management activities
Pro forma net presentation, asset, total $ 28.7 $ 52.2
Counterparties with Offsetting Positions or Collateral [Member]    
Derivative Asset [Abstract]    
Derivative assets 100.9 186.7
Pro forma net presentation, asset, total 27.7 34.5
Counterparties without Offsetting Position [Member]    
Derivative Asset [Abstract]    
Derivative assets 1.0 17.7
Pro forma net presentation, asset, current 1.0 17.7
Pro forma net presentation, asset, total 1.0 17.7
Current Assets from Risk Management Activities [Member]    
Derivative Asset [Abstract]    
Derivative assets 84.2 179.9
Current Assets from Risk Management Activities [Member] | Counterparties with Offsetting Positions or Collateral [Member]    
Derivative Asset [Abstract]    
Derivative assets 83.2 162.2
Pro forma net presentation, asset 25.6 27.2
Current Assets from Risk Management Activities [Member] | Counterparties without Offsetting Position [Member]    
Derivative Asset [Abstract]    
Derivative assets 1.0 17.7
Other Long-term Assets [Member]    
Derivative Asset [Abstract]    
Derivative assets 17.7 24.5
Other Long-term Assets [Member] | Counterparties with Offsetting Positions or Collateral [Member]    
Derivative Asset [Abstract]    
Derivative assets 17.7 24.5
Pro forma net presentation, asset $ 2.1 $ 7.3