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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

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