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Derivative Instruments and Hedging Activities - Pro Forma Impact Of Offsetting Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Derivative Liability [Abstract] |  |
Gross liability | $ (155.1) | $ (70.8)
Pro forma net presentation, liability, current | $ (17.0) | $ (7.9)
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration] | Derivative Liability Before Effects Of Master Netting Arrangements Current | Derivative Liability Before Effects Of Master Netting Arrangements Current
Pro forma net presentation, liability, noncurrent | $ (49.5) | $ (2.2)
Derivative Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Derivative Liability Before Effects Of Master Netting Arrangements Noncurrent | Derivative Liability Before Effects Of Master Netting Arrangements Noncurrent
Pro forma net presentation, liability, total | $ (66.5) | $ (10.1)
Counterparties with Offsetting Positions or Collateral [Member] |  |
Derivative Liability [Abstract] |  |
Gross liability | (152.3) | (70.8)
Pro forma net presentation, liability, current | (17.0) | (7.9)
Pro forma net presentation, liability, noncurrent | (46.7) | (2.2)
Pro forma net presentation, liability, total | (63.7) | (10.1)
Counterparties without Offsetting Position [Member] |  |
Derivative Liability [Abstract] |  |
Gross liability | (2.8) |
Pro forma net presentation, liability, noncurrent | (2.8) |
Pro forma net presentation, liability, total | (2.8) |
Current Liabilities from Risk Management Activities [Member] |  |
Derivative Liability [Abstract] |  |
Gross liability | (72.2) | (54.0)
Current Liabilities from Risk Management Activities [Member] | Counterparties with Offsetting Positions or Collateral [Member] |  |
Derivative Liability [Abstract] |  |
Gross liability | (72.2) | (54.0)
Long-Term Liabilities from Risk Management Activities [Member] |  |
Derivative Liability [Abstract] |  |
Gross liability | (82.9) | (16.8)
Long-Term Liabilities from Risk Management Activities [Member] | Counterparties with Offsetting Positions or Collateral [Member] |  |
Derivative Liability [Abstract] |  |
Gross liability | (80.1) | $ (16.8)
Long-Term Liabilities from Risk Management Activities [Member] | Counterparties without Offsetting Position [Member] |  |
Derivative Liability [Abstract] |  |
Gross liability | $ (2.8) |

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