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Derivative Instruments and Hedging Activities - Pro Forma Impact Of Offsetting Liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Derivative Liability [Abstract] |  |
Gross liability | $ (432.5) | $ (186.0)
Pro forma net presentation, liability, total | (362.7) | (67.6)
Counterparties with Offsetting Positions or Collateral [Member] |  |
Derivative Liability [Abstract] |  |
Gross liability | (280.1) | (184.5)
Pro forma net presentation, liability, total | (210.3) | (66.1)
Counterparties without Offsetting Position [Member] |  |
Derivative Liability [Abstract] |  |
Gross liability | (152.4) | (1.5)
Pro forma net presentation, liability, total | (152.4) | (1.5)
Current Liabilities from Risk Management Activities [Member] |  |
Derivative Liability [Abstract] |  |
Gross liability | (292.0) | (142.6)
Pro forma net presentation, liability, current | (228.7) | (47.4)
Current Liabilities from Risk Management Activities [Member] | Counterparties with Offsetting Positions or Collateral [Member] |  |
Derivative Liability [Abstract] |  |
Gross liability | (203.3) | (142.0)
Pro forma net presentation, liability, current | (140.0) | (46.8)
Current Liabilities from Risk Management Activities [Member] | Counterparties without Offsetting Position [Member] |  |
Derivative Liability [Abstract] |  |
Gross liability | (88.7) | (0.6)
Pro forma net presentation, liability, current |  | (0.6)
Long-Term Liabilities from Risk Management Activities [Member] |  |
Derivative Liability [Abstract] |  |
Gross liability | (140.5) | (43.4)
Pro forma net presentation, liability, noncurrent | (134.0) | (20.2)
Long-Term Liabilities from Risk Management Activities [Member] | Counterparties with Offsetting Positions or Collateral [Member] |  |
Derivative Liability [Abstract] |  |
Gross liability | (76.8) | (42.5)
Pro forma net presentation, liability, noncurrent | (70.3) | (19.3)
Long-Term Liabilities from Risk Management Activities [Member] | Counterparties without Offsetting Position [Member] |  |
Derivative Liability [Abstract] |  |
Gross liability | (63.7) | (0.9)
Pro forma net presentation, liability, noncurrent | $ (63.7) | $ (0.9)

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