Results of Operations, Loss before Income Taxes

No definition available.

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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.

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- Definition

Amount classified as assets attributable to disposal group held for sale or disposed of, expected to be disposed of after one year or the normal operating cycle, if longer.

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- Definition

Amount of gain (loss) on sale or disposal of proven and unproven oil and gas properties.

+ References

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations.

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Acquisitions & Divestitures Uinta Basin (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Sale of Oil and Gas Property and Equipment			$ 676.5	$ 217.5
Noncurrent assets held for sale	$ 0.0		0.0		$ 692.7
Gain (Loss) on Disposition of Oil and Gas Property	(2.1)	$ 27.1	2.5	26.7
Impairment	$ 0.0	0.0	5.0	404.4
Uinta Basin [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Sale of Oil and Gas Property and Equipment				153.0
Gain (Loss) on Disposition of Oil and Gas Property				(12.4)
Results of Operations, Loss before Income Taxes		$ 4.4	$ 0.2	419.3
Impairment				$ 402.8