Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Millions, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenues
Sales	$ 1,800.8	$ 1,569.8	$ 3,414.5	$ 2,954.9
Other revenues	207.2	91.6	338.4	222.1
Total revenues	2,008.0	1,661.4	3,752.9	3,177.0
Costs and expenses
Operating costs and expenses	1,392.8	1,174.7	2,660.9	2,283.4
Depreciation, depletion and amortization	105.3	105.1	214.1	210.6
Asset retirement obligation expense	15.8	10.9	28.9	20.4
Selling and administrative expenses	58.6	54.1	120.2	109.5
Other operating (income) loss:
Net gain on disposal or exchange of assets	(25.7)	(1.4)	(29.7)	(8.7)
Loss (income) from equity affiliates	2.8	(6.4)	5.8	(4.8)
Operating profit	458.4	324.4	752.7	566.6
Interest expense	49.1	57.9	100.1	107.9
Interest income	(3.5)	(1.6)	(7.6)	(2.6)
Income from continuing operations before income taxes	412.8	268.1	660.2	461.3
Income tax provision	119.8	53.4	187.6	109.5
Income from continuing operations, net of income taxes	293.0	214.7	472.6	351.8
Loss from discontinued operations, net of income taxes	(0.8)	(0.5)	(1.7)	(0.9)
Net income	292.2	214.2	470.9	350.9
Less: Net income attributable to noncontrolling interests	7.4	8.0	9.6	11.0
Net income attributable to common stockholders	$ 284.8	$ 206.2	$ 461.3	$ 339.9
Income From Continuing Operations
Basic earnings per share	$ 1.05	$ 0.77	$ 1.71	$ 1.27
Diluted earnings per share	$ 1.05	$ 0.76	$ 1.70	$ 1.26
Net Income Attributable to Common Stockholders
Basic earnings per share	$ 1.05	$ 0.77	$ 1.70	$ 1.27
Diluted earnings per share	$ 1.05	$ 0.76	$ 1.69	$ 1.26
Dividends declared per share	$ 0.085	$ 0.070	$ 0.170	$ 0.140