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Fair Value Measurements - Additional Information (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 USD ($) | Jun. 30, 2020 USD ($) Swap
Fair Value Disclosures [Abstract] |  |
Estimated fair value of derivative instruments, net asset |  | $ 31.9
Derivative fair value of net liability if commodity price increases by 10 percent |  | (86.5)
Derivative fair value of net asset if commodity price decreases by 10 percent |  | $ 150.7
Number of natural gas basis swaps categorized as Level 3 | Swap |  | 0
Non-cash pre-tax impairments | $ 2,442.8 |

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- Definition Fair value as of the balance sheet date of the assets less the liabilities of a derivative or group of derivatives if the commodity price decreases by 10 percent. + References No definition available. + Details
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- Definition Fair value as of the balance sheet date of the assets less the liabilities of a derivative or group of derivatives if the commodity price increases by 10 percent. + References No definition available. + Details
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- Definition This line item represents the number of natural gas basis swaps categorized as Level 3 by the entity. + References No definition available. + Details
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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611 + Details
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