Consolidated Statements of Income (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues
Sales	$ 6,380.0	$ 7,041.7	$ 7,013.0
Other revenues	633.7	1,035.8	882.9
Total revenues	7,013.7	8,077.5	7,895.9
Costs and expenses
Operating costs and expenses (exclusive of items shown separately below)	5,736.1	5,932.7	5,477.6
Depreciation, depletion and amortization	740.3	663.4	474.3
Asset retirement obligation expenses	66.5	67.0	52.6
Selling and administrative expenses	249.1	268.8	268.2
Acquisition costs related to Macarthur Coal Limited	0	0	85.2
Other operating (income) loss:
Net gain on disposal or exchange of assets	(52.6)	(17.1)	(76.9)
Asset impairment and mine closure costs	528.3	929.0	0
Settlement charges related to the Patriot bankruptcy reorganization	30.6	0	0
Loss from equity affiliates	40.2	61.2	19.2
Operating (loss) profit	(324.8)	172.5	1,595.7
Interest expense	425.2	405.6	238.6
Interest income	(15.7)	(24.5)	(18.9)
(Loss) income from continuing operations before income taxes	(734.3)	(208.6)	1,376.0
Income tax (benefit) provision	(448.3)	262.3	363.2
(Loss) income from continuing operations, net of income taxes	(286.0)	(470.9)	1,012.8
Loss from discontinued operations, net of income taxes	(226.6)	(104.2)	(66.5)
Net (loss) income	(512.6)	(575.1)	946.3
Less: Net income (loss) attributable to noncontrolling interests	12.3	10.6	(11.4)
Net (loss) income attributable to common stockholders	$ (524.9)	$ (585.7)	$ 957.7
(Loss) Income From Continuing Operations
Basic (loss) earnings per share	$ (1.12)	$ (1.80)	$ 3.78
Diluted (loss) earnings per share	$ (1.12)	$ (1.80)	$ 3.77
Net (Loss) Income Attributable to Common Stockholders
Basic (loss) earnings per share	$ (1.97)	$ (2.19)	$ 3.53
Diluted (loss) earnings per share	$ (1.97)	$ (2.19)	$ 3.52
Dividends declared per share	$ 0.340	$ 0.340	$ 0.340