Condensed Consolidated Balance Sheets (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Current assets
Cash and cash equivalents	$ 1,176.9	$ 1,295.2
Short-term investments	75.0	0
Accounts receivable, net of allowance for doubtful accounts of $22.7 at June 30, 2011 and $30.3 at December 31, 2010	644.8	558.2
Inventories	374.0	332.9
Assets from coal trading activities, net	109.2	192.5
Deferred income taxes	103.5	120.4
Other current assets	627.0	459.0
Total current assets	3,110.4	2,958.2
Property, plant, equipment and mine development
Land and coal interests	7,729.7	7,657.0
Buildings and improvements	1,090.0	1,079.8
Machinery and equipment	1,952.9	1,699.3
Less: accumulated depreciation, depletion and amortization	(3,188.6)	(3,010.0)
Property, plant, equipment and mine development, net	7,584.0	7,426.1
Investments and other assets	1,051.2	978.8
Total assets	11,745.6	11,363.1
Current liabilities
Current maturities of long-term debt	43.8	43.2
Liabilities from coal trading activities, net	106.1	181.7
Accounts payable and accrued expenses	1,335.6	1,288.8
Total current liabilities	1,485.5	1,513.7
Long-term debt, less current maturities	2,468.2	2,706.8
Deferred income taxes	597.8	539.8
Asset retirement obligations	520.4	501.3
Accrued postretirement benefit costs	965.5	963.9
Other noncurrent liabilities	462.9	448.3
Total liabilities	6,500.3	6,673.8
Stockholders' equity
Preferred Stock	0	0
Common Stock	2.8	2.8
Additional paid-in capital	2,217.1	2,182.0
Retained earnings	3,292.9	2,878.4
Accumulated other comprehensive income (loss)	52.6	(67.9)
Treasury shares, at cost: 9,152,030 shares as of June 30, 2011 and 8,912,772 shares as of December 31, 2010	(350.0)	(334.6)
Peabody Energy Corporation's stockholders' equity	5,215.4	4,660.7
Noncontrolling interests	29.9	28.6
Total stockholders' equity	5,245.3	4,689.3
Total liabilities and stockholders' equity	11,745.6	11,363.1
Series A Junior Participating Preferred Stock
Stockholders' equity
Preferred Stock	0	0
Perpetual Preferred Stock
Stockholders' equity
Preferred Stock	0	0
Series Common Stock
Stockholders' equity
Common Stock	$ 0	$ 0