CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017
OPERATING ACTIVITIES
Net income (loss)	$ (382.3)	$ 119.0
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation, depletion and amortization	673.6	560.2
Deferred income taxes (benefit)	(119.6)	68.5
Impairment	404.4	28.4
Results of Operations, Dry Hole Costs	0.0	21.2
Share-based compensation	28.3	13.5
Amortization of debt issuance costs and discounts	4.0	4.8
Bargain purchase gain from acquisition	0.0	0.4
Net (gain) loss from asset sales, inclusive of restructuring costs	(26.7)	(205.2)
Unrealized (gains) losses on marketable securities	(1.1)	(2.1)
Unrealized (gains) losses on derivative contracts	113.2	(161.6)
Other Operating Activities, Cash Flow Statement	0.0	(9.4)
Changes in operating assets and liabilities	(18.9)	45.1
Net Cash Provided by (Used in) Operating Activities	674.9	482.8
INVESTING ACTIVITIES
Property acquisitions	(48.3)	(94.5)
Property, plant and equipment, including exploratory well expense	(1,032.1)	(779.6)
Proceeds from disposition of assets	217.5	787.9
Net Cash Provided by (Used in) Investing Activities	(862.9)	(86.2)
FINANCING ACTIVITIES
Checks outstanding in excess of cash balances	(28.7)	(12.3)
Long-term debt issuance costs paid	0.1	(1.1)
Proceeds from credit facility	2,616.0	2.0
Repayments of credit facility	(2,329.5)	(2.0)
Common stock repurchased and retired	(58.4)	0.0
Treasury stock repurchases	(7.8)	(6.8)
Other capital contributions	0.3	0.0
Net Cash Provided by (Used in) Financing Activities	191.8	(20.2)
Change in cash, cash equivalents and restricted cash	3.8	376.4
Beginning cash, cash equivalents and restricted cash(1)	23.4	465.4
Ending cash, cash equivalents and restricted cash(1)	27.2	841.8
Supplemental Disclosures:
Cash paid for interest, net of capitalized interest	100.2	96.6
Cash paid for income taxes, net	0.3	0.5
Non-cash Investing Activities:
Change in capital expenditure accruals and other non-cash adjustments	$ (43.9)	$ 68.0

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Dry hole costs from oil and gas producing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 360
-Section 25
-Paragraph 9
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=96866604&loc=d3e64954-109465

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 23
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62136-109447

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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- Definition

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- References

No definition available.

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- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

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