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Derivative Instruments and Hedging Activities - Pro Forma Impact Of Offsetting Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Derivative Liability [Abstract] |  |
Gross liability | $ (186.0) | $ (144.9)
Pro forma net presentation, liability, total | (67.6) | (90.8)
Counterparties with Offsetting Positions or Collateral [Member] |  |
Derivative Liability [Abstract] |  |
Gross liability | (184.5) | (125.5)
Pro forma net presentation, liability, total | (66.1) | (71.4)
Counterparties without Offsetting Position [Member] |  |
Derivative Liability [Abstract] |  |
Gross liability | (1.5) | (19.4)
Pro forma net presentation, liability, total | (1.5) | (19.4)
Current Liabilities from Risk Management Activities [Member] |  |
Derivative Liability [Abstract] |  |
Gross liability | (142.6) | (104.1)
Pro forma net presentation, liability, current | (47.4) | (65.2)
Current Liabilities from Risk Management Activities [Member] | Counterparties with Offsetting Positions or Collateral [Member] |  |
Derivative Liability [Abstract] |  |
Gross liability | (142.0) | (85.0)
Pro forma net presentation, liability, current | (46.8) | (46.1)
Current Liabilities from Risk Management Activities [Member] | Counterparties without Offsetting Position [Member] |  |
Derivative Liability [Abstract] |  |
Gross liability | (0.6) | (19.1)
Pro forma net presentation, liability, current | (0.6) | (19.1)
Long-Term Liabilities from Risk Management Activities [Member] |  |
Derivative Liability [Abstract] |  |
Gross liability | (43.4) | (40.8)
Pro forma net presentation, liability, noncurrent | (20.2) | (25.6)
Long-Term Liabilities from Risk Management Activities [Member] | Counterparties with Offsetting Positions or Collateral [Member] |  |
Derivative Liability [Abstract] |  |
Gross liability | (42.5) | (40.5)
Pro forma net presentation, liability, noncurrent | (19.3) | (25.3)
Long-Term Liabilities from Risk Management Activities [Member] | Counterparties without Offsetting Position [Member] |  |
Derivative Liability [Abstract] |  |
Gross liability | (0.9) | (0.3)
Pro forma net presentation, liability, noncurrent | $ (0.9) | $ (0.3)

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