Fair Value Measurements - Schedule of Nonrecurring Fair Value Measurements (Details) - USD ($)
$ in Millions |
|
3 Months Ended |
9 Months Ended |
|
May 22, 2020 |
Sep. 30, 2020 |
Sep. 30, 2020 |
Dec. 31, 2019 |
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Fair Value Measurement Input, Credit Spread |
12.00%
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| Fair Value Measurement Input, Yield Volatility |
45.00%
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| Fair Value, Nonrecurring [Member] | Proved Property [Member] |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Property, Plant, and Equipment, Fair Value Disclosure |
|
$ 179.6
|
$ 179.6
|
$ 771.4
|
| Asset Impairment Charges |
|
|
$ 591.8
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| Minimum | Proved Property [Member] |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Percentage of Undiscounted cash flows exceeding carrying values |
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30.00%
|
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| Maximum | Proved Property [Member] |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Percentage of Undiscounted cash flows exceeding carrying values |
|
100.00%
|
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| Senior Notes | Senior Secured Note Due 2025 [Member] |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Private placement price as percentage of par |
83.44%
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