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Derivative Instruments and Hedging Activities - Pro Forma Impact Of Offsetting Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Derivative Asset [Abstract]    
Derivative assets $ 79.7 $ 145.2
Pro forma net presentation, asset, current $ 7.2 $ 69.4
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 $ 1.2 $ 18.6
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 $ 8.4 $ 88.0
Counterparties with Offsetting Positions or Collateral [Member]    
Derivative Asset [Abstract]    
Derivative assets 79.7 143.4
Pro forma net presentation, asset, total 8.4 86.2
Counterparties without Offsetting Position [Member]    
Derivative Asset [Abstract]    
Derivative assets   1.8
Pro forma net presentation, asset, current   0.2
Pro forma net presentation, asset, noncurrent   1.6
Pro forma net presentation, asset, total   1.8
Current Assets from Risk Management Activities [Member]    
Derivative Asset [Abstract]    
Derivative assets 62.8 111.9
Current Assets from Risk Management Activities [Member] | Counterparties with Offsetting Positions or Collateral [Member]    
Derivative Asset [Abstract]    
Derivative assets 62.8 111.7
Pro forma net presentation, asset 7.2 69.2
Current Assets from Risk Management Activities [Member] | Counterparties without Offsetting Position [Member]    
Derivative Asset [Abstract]    
Derivative assets   0.2
Other Long-term Assets [Member]    
Derivative Asset [Abstract]    
Derivative assets 16.9 33.3
Other Long-term Assets [Member] | Counterparties with Offsetting Positions or Collateral [Member]    
Derivative Asset [Abstract]    
Derivative assets 16.9 31.7
Pro forma net presentation, asset $ 1.2 17.0
Other Long-term Assets [Member] | Counterparties without Offsetting Position [Member]    
Derivative Asset [Abstract]    
Derivative assets   $ 1.6