CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
OPERATING ACTIVITIES
Net income (loss)	$ (97.3)	$ (1,011.6)	$ 269.3
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation, depletion and amortization	540.0	857.1	754.5
Deferred income taxes	4.3	(247.6)	(314.8)
Impairment	5.0	1,560.9	78.9
Dry hole exploratory well expense	0.0	0.0	21.3
Non-cash share-based compensation	20.8	30.9	26.9
Amortization of debt issuance costs and discounts	5.4	5.4	6.2
Bargain purchase gain from acquisitions	0.0	0.0	0.4
Net (gain) loss from asset sales, inclusive of restructuring costs	(3.9)	(25.0)	(213.5)
Loss from early extinguishment of debt	1.0	0.0	32.7
Unrealized (gains) losses on marketable securities	(3.9)	1.2	(2.9)
Unrealized (gains) losses on derivative contracts	138.3	(248.5)	(40.0)
Other non-cash activity	0.0	0.0	(9.4)
Accounts receivable	(4.1)	33.7	(2.0)
Prepaid expenses	(0.4)	(2.0)	(1.3)
Accounts payable and accrued expenses	(40.4)	(74.2)	3.5
Income taxes receivable	38.4	(71.0)	13.7
Other	(36.3)	6.9	(23.3)
Net Cash Provided by (Used in) Operating Activities	566.9	816.2	600.2
INVESTING ACTIVITIES
Property acquisitions	(3.5)	(65.6)	(815.2)
Property, plant and equipment	(562.7)	(1,234.1)	(1,159.6)
Proceeds from disposition of assets	678.9	243.6	806.8
Net Cash Provided by (Used in) Investing Activities	112.7	(1,056.1)	(1,168.0)
FINANCING ACTIVITIES
Checks outstanding in excess of cash balances	3.7	(29.5)	31.7
Long-term debt issued	0.0	0.0	500.0
Long-term debt issuance costs paid	0.0	(0.1)	(14.4)
Long-term debt extinguishment costs paid	(1.0)	0.0	(28.1)
Long-term debt repaid	(66.9)	0.0	(445.6)
Proceeds from credit facility	56.1	3,608.0	492.0
Repayments of credit facility	(486.0)	(3,267.0)	(403.0)
Common stock repurchased and retired	0.0	(58.4)	0.0
Treasury stock repurchases	(7.6)	(8.7)	(6.8)
Dividends paid	(9.6)	0.0	0.0
Other capital contributions	0.0	0.3	0.0
Net Cash Provided by (Used in) Financing Activities	(511.3)	244.6	125.8
Change in cash, cash equivalents and restricted cash(1)	168.3	4.7	(442.0)
Beginning cash, cash equivalents and restricted cash(1)	28.1	23.4	465.4
Ending cash, cash equivalents and restricted cash(1)	$ 196.4	$ 28.1	$ 23.4

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