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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.

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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

The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy.

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

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The cash outflow to purchase of mineral interests in oil and gas properties for use in the normal oil and gas operations and not intended for resale.

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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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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Acquisitions & Divestitures Haynesville Divestiture (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Business Acquisition [Line Items]
Noncurrent assets held for sale	$ 0.0	$ 692.7
Payments to acquire oil and gas property	0.6		$ 36.2
Proceeds from Sale of Oil and Gas Property and Equipment	617.4		33.3
Gain (Loss) on Disposition of Oil and Gas Property	(13.2)		3.5
Escrow Deposit	22.1
Haynesville Divestiture [Member]
Business Acquisition [Line Items]
Payments to acquire oil and gas property		735.0
Proceeds from Sale of Oil and Gas Property and Equipment	615.3
Gain (Loss) on Disposition of Oil and Gas Property	(15.0)	(3.0)
Results of Operations, Loss before Income Taxes	(11.1)		$ 12.3
Restructuring Charges	(1.4)
Property, Plant and Equipment [Member] \| Haynesville Divestiture [Member]
Business Acquisition [Line Items]
Noncurrent assets held for sale		683.7
Other Noncurrent Assets [Member] \| Haynesville Divestiture [Member]
Business Acquisition [Line Items]
Noncurrent assets held for sale		7.8
Noncurrent Assets Held for Sale [Member] \| Haynesville Divestiture [Member]
Business Acquisition [Line Items]
Noncurrent assets held for sale		692.7
Other Current Liabilities [Member] \| Haynesville Divestiture [Member]
Business Acquisition [Line Items]
Noncurrent assets held for sale		3.4
Asset Retirement Obligations, Current [Member] \| Haynesville Divestiture [Member]
Business Acquisition [Line Items]
Noncurrent assets held for sale		0.7
Asset Retirement Obligations, Long Term [Member] \| Haynesville Divestiture [Member]
Business Acquisition [Line Items]
Noncurrent assets held for sale		56.9
Derivative Financial Instruments, Liabilities [Member] \| Haynesville Divestiture [Member]
Business Acquisition [Line Items]
Noncurrent assets held for sale		0.3
Other Noncurrent Liabilities [Member] \| Haynesville Divestiture [Member]
Business Acquisition [Line Items]
Noncurrent assets held for sale		61.3
Other Current Assets [Member] \| Haynesville Divestiture [Member]
Business Acquisition [Line Items]
Noncurrent assets held for sale		$ 1.2
Total incurred to date [Member] \| Haynesville Divestiture [Member]
Business Acquisition [Line Items]
Gain (Loss) on Disposition of Oil and Gas Property	(18.0)
Accounts Receivable [Member]
Business Acquisition [Line Items]
Escrow Deposit	$ 5.8