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Fair Value Measurements - Additional Information (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 USD ($) | Jun. 30, 2021 USD ($) Derivative
Fair Value Disclosures [Abstract] |  |
Estimated fair value of derivative instruments, net liability |  | $ (349.2)
Derivative fair value of net liability if commodity price increases by 10 percent |  | (475.9)
Derivative fair value of net liability if commodity price decreases by 10 percent |  | $ (222.5)
Derivative contracts categorized as Level 3 | Derivative |  | 2
Non-cash pre-tax impairments | $ 2,442.8 |

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