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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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Acquisitions & Divestitures Haynesville Divestiture (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Business Acquisition [Line Items]
Noncurrent assets held for sale	$ 0.0	$ 692.7		$ 0.0
Payments to acquire oil and gas property				1.8	$ 45.1
Proceeds from Sale of Oil and Gas Property and Equipment				666.7	48.8
Gain (Loss) on Disposition of Oil and Gas Property	17.8		$ (3.9)	4.6	(0.4)
Haynesville Divestiture [Member]
Business Acquisition [Line Items]
Payments to acquire oil and gas property		634.2
Proceeds from Sale of Oil and Gas Property and Equipment				627.1
Gain (Loss) on Disposition of Oil and Gas Property	14.3	3.0		0.7
Results of Operations, Loss before Income Taxes	$ 14.4		$ 7.4	3.3	$ 19.7
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				(3.7)
Accounts Receivable [Member] \| Haynesville Divestiture [Member]
Business Acquisition [Line Items]
Proceeds from Sale of Oil and Gas Property and Equipment				9.5
Accounts Payable [Member] \| Haynesville Divestiture [Member]
Business Acquisition [Line Items]
Proceeds from Sale of Oil and Gas Property and Equipment				$ (2.4)