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Derivative Instruments and Hedging Activities - Pro Forma Impact Of Offsetting Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Derivative Asset [Abstract]    
Derivative assets $ 110.3 $ 145.2
Pro forma net presentation, asset, current $ 27.3 $ 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 $ 12.7 $ 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 $ 40.0 $ 88.0
Counterparties with Offsetting Positions or Collateral [Member]    
Derivative Asset [Abstract]    
Derivative assets 95.5 143.4
Pro forma net presentation, asset, total 25.2 86.2
Counterparties without Offsetting Position [Member]    
Derivative Asset [Abstract]    
Derivative assets 14.8 1.8
Pro forma net presentation, asset, current 9.4 0.2
Pro forma net presentation, asset, noncurrent 5.4 1.6
Pro forma net presentation, asset, total 14.8 1.8
Current Assets from Risk Management Activities [Member]    
Derivative Asset [Abstract]    
Derivative assets 75.0 111.9
Current Assets from Risk Management Activities [Member] | Counterparties with Offsetting Positions or Collateral [Member]    
Derivative Asset [Abstract]    
Derivative assets 65.6 111.7
Pro forma net presentation, asset 17.9 69.2
Current Assets from Risk Management Activities [Member] | Counterparties without Offsetting Position [Member]    
Derivative Asset [Abstract]    
Derivative assets 9.4 0.2
Other Long-term Assets [Member]    
Derivative Asset [Abstract]    
Derivative assets 35.3 33.3
Other Long-term Assets [Member] | Counterparties with Offsetting Positions or Collateral [Member]    
Derivative Asset [Abstract]    
Derivative assets 29.9 31.7
Pro forma net presentation, asset 7.3 17.0
Other Long-term Assets [Member] | Counterparties without Offsetting Position [Member]    
Derivative Asset [Abstract]    
Derivative assets $ 5.4 $ 1.6