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Fair Value Measurements - Additional Information (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) Swap | Dec. 31, 2019 USD ($)
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |  |
Estimated fair value of derivative instruments, net liability |  | $ 51.2 |
Derivative fair value of net liability if commodity price increases by 10 percent |  | (158.5) |
Derivative fair value of net asset if commodity price decreases by 10 percent |  | $ 56.4 |
Number of natural gas basis swaps categorized as Level 3 | Swap |  | 1 |
Non-cash pre-tax impairments | $ 225.3 | $ 2,442.8 | $ 225.3

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