Condensed Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 508.1	$ 444.0
Accounts receivable, net of allowance for doubtful accounts of $7.5 at March 31, 2014 and $7.4 at December 31, 2013	454.4	557.9
Inventories	549.4	506.7
Assets from coal trading activities, net	50.2	36.1
Deferred income taxes	64.2	66.4
Other current assets	283.9	381.6
Total current assets	1,910.2	1,992.7
Property, plant, equipment and mine development, net	10,855.4	11,082.5
Deferred income taxes	62.3	7.8
Investments and other assets	1,017.2	1,050.4
Total assets	13,845.1	14,133.4
Current liabilities
Current maturities of long-term debt	20.8	31.7
Deferred income taxes	7.3	0
Liabilities from coal trading activities, net	11.6	6.1
Accounts payable and accrued expenses	1,559.9	1,737.7
Total current liabilities	1,599.6	1,775.5
Long-term debt, less current maturities	5,977.4	5,970.7
Deferred income taxes	31.1	40.9
Asset retirement obligations	715.2	712.8
Accrued postretirement benefit costs	711.3	684.0
Other noncurrent liabilities	794.8	1,001.6
Total liabilities	9,829.4	10,185.5
Stockholders' equity
Additional paid-in capital	2,351.8	2,340.0
Treasury stock, at cost — 13.9 shares as of March 31, 2014 and 13.8 shares as of December 31, 2013	(466.7)	(464.7)
Retained earnings	2,378.2	2,449.8
Accumulated other comprehensive loss	(293.3)	(419.2)
Peabody Energy Corporation stockholders' equity	3,972.9	3,908.7
Noncontrolling interests	42.8	39.2
Total stockholders' equity	4,015.7	3,947.9
Total liabilities and stockholders' equity	13,845.1	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