CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current Assets
Cash and cash equivalents	$ 0	$ 11.9
Accounts receivable, net	599.4	316.3
Fair value of derivative contracts	32.6	0.2
Gas, oil and NGL inventories at lower of average cost or market	16.4	13.4
Deferred income taxes - current	0	27.9
Prepaid expenses and other	50.8	45.4
Current assets of discontinued operations held for sale	138.3	122.0
Total Current Assets	837.5	537.1
Property, Plant and Equipment (successful efforts method for gas and oil properties)
Proved properties	11,723.0	11,571.4
Unproved properties	1,120.5	665.1
Midstream	197.5	197.3
Marketing and resources	95.2	85.5
Material and supplies	55.3	54.3
Total Property, Plant and Equipment	13,191.5	12,573.6
Less Accumulated Depreciation, Depletion and Amortization
Exploration and production	4,915.0	4,930.9
Midstream	34.3	28.1
Marketing and resources	29.8	22.1
Total Accumulated Depreciation, Depletion and Amortization	4,979.1	4,981.1
Net Property, Plant and Equipment	8,212.4	7,592.5
Fair value of derivative contracts	12.7	1.0
Restricted cash	0	50.0
Other noncurrent assets	39.4	46.6
Noncurrent assets of discontinued operations held for sale	1,174.2	1,167.7
TOTAL ASSETS	10,276.2	9,394.9
Current Liabilities
Checks outstanding in excess of cash balances	36.8	109.1
Accounts payable and accrued expenses	691.4	361.9
Production and property taxes	73.5	49.4
Interest payable	34.1	37.2
Fair value of derivative contracts	4.5	26.7
Deferred income taxes	2.9	0
Current liabilities of discontinued operations held for sale	161.6	75.3
Total Current Liabilities	1,004.8	659.6
Long-term debt	3,115.5	2,997.5
Deferred income taxes	1,500.8	1,364.9
Asset retirement obligations	162.3	163.3
Fair value of derivative contracts	0.2	0
Other long-term liabilities	90.3	94.5
Noncurrent liabilities of discontinued operations held for sale	402.0	238.3
Commitments and contingencies
EQUITY
Common stock - par value $0.01 per share; 500.0 million shares authorized; 180.9 million and 179.7 million shares issued, respectively	1.8	1.8
Treasury stock - 0.8 million and 0.4 million shares, respectively	(25.1)	(14.9)
Additional paid-in capital	527.2	498.4
Retained earnings	3,025.4	2,917.8
Accumulated other comprehensive loss	(23.7)	(26.5)
Total Common Shareholders' Equity	3,505.6	3,376.6
Noncontrolling interest	494.7	500.2
Total Equity	4,000.3	3,876.8
TOTAL LIABILITIES AND EQUITY	$ 10,276.2	$ 9,394.9