Condensed Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 498.4	$ 444.0
Accounts receivable, net of allowance for doubtful accounts of $5.8 at June 30, 2014 and $7.4 at December 31, 2013	447.1	557.9
Inventories	548.4	506.7
Assets from coal trading activities, net	50.8	36.1
Deferred income taxes	67.2	66.4
Other current assets	265.9	381.6
Total current assets	1,877.8	1,992.7
Property, plant, equipment and mine development, net	10,700.5	11,082.5
Deferred income taxes	82.1	7.8
Investments and other assets	1,031.8	1,050.4
Total assets	13,692.2	14,133.4
Current liabilities
Current maturities of long-term debt	20.8	31.7
Deferred income taxes	7.5	0
Liabilities from coal trading activities, net	14.4	6.1
Accounts payable and accrued expenses	1,462.0	1,737.7
Total current liabilities	1,504.7	1,775.5
Long-term debt, less current maturities	5,973.2	5,970.7
Deferred income taxes	59.5	40.9
Asset retirement obligations	721.2	712.8
Accrued postretirement benefit costs	713.0	684.0
Other noncurrent liabilities	716.2	1,001.6
Total liabilities	9,687.8	10,185.5
Stockholders' equity
Additional paid-in capital	2,361.7	2,340.0
Treasury stock, at cost — 13.9 shares as of June 30, 2014 and 13.8 shares as of December 31, 2013	(466.9)	(464.7)
Retained earnings	2,281.9	2,449.8
Accumulated other comprehensive loss	(218.8)	(419.2)
Peabody Energy Corporation stockholders' equity	3,960.8	3,908.7
Noncontrolling interests	43.6	39.2
Total stockholders' equity	4,004.4	3,947.9
Total liabilities and stockholders' equity	13,692.2	14,133.4
Preferred Stock [Member]
Stockholders' equity
Preferred Stock	0	0
Perpetual Preferred Stock [Member]
Stockholders' equity
Preferred Stock	0	0
Series Common Stock [Member]
Stockholders' equity
Common Stock	0	0
Common Stock [Member]
Stockholders' equity
Common Stock	$ 2.9	$ 2.8