Consolidated Statements of Income (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues
Sales	$ 7,041.7	$ 7,013.0	$ 6,139.6
Other revenues	1,035.8	882.9	528.6
Total revenues	8,077.5	7,895.9	6,668.2
Costs and expenses
Operating costs and expenses	5,932.7	5,477.6	4,637.7
Depreciation, depletion and amortization	663.4	474.3	429.5
Asset retirement obligation expenses	67.0	52.6	45.9
Selling and administrative expenses	268.8	268.2	232.2
Acquisition costs related to Macarthur Coal Limited	0	85.2	0
Other operating (income) loss:
Net gain on disposal or exchange of assets	(17.1)	(76.9)	(29.9)
Asset impairment and mine closure costs	929.0	0	0
Loss from equity affiliates	61.2	19.2	1.7
Operating profit	172.5	1,595.7	1,351.1
Interest expense	405.6	238.6	222.0
Interest income	(24.5)	(18.9)	(9.6)
(Loss) income from continuing operations before income taxes	(208.6)	1,376.0	1,138.7
Income tax provision	262.3	363.2	313.7
(Loss) Income from continuing operations, net of income taxes	(470.9)	1,012.8	825.0
Loss from discontinued operations, net of income taxes	(104.2)	(66.5)	(22.8)
Net (loss) income	(575.1)	946.3	802.2
Less: Net income (loss) attributable to noncontrolling interests	10.6	(11.4)	28.2
Net (loss) income attributable to common stockholders	$ (585.7)	$ 957.7	$ 774.0
(Loss) Income From Continuing Operations
Basic (loss) earnings per share	$ (1.80)	$ 3.78	$ 2.96
Diluted (loss) earnings per share	$ (1.80)	$ 3.77	$ 2.92
Net (Loss) Income Attributable to Common Stockholders
Basic (loss) earnings per share	$ (2.19)	$ 3.53	$ 2.88
Diluted (loss) earnings per share	$ (2.19)	$ 3.52	$ 2.84
Dividends declared per share	$ 0.340	$ 0.340	$ 0.295