Condensed Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 466.5	$ 444.0
Accounts receivable, net of allowance for doubtful accounts of $7.1 at September 30, 2014 and $7.4 at December 31, 2013	490.0	557.9
Inventories	490.9	506.7
Assets from coal trading activities, net	52.7	36.1
Deferred income taxes	106.9	66.4
Other current assets	324.4	381.6
Total current assets	1,931.4	1,992.7
Property, plant, equipment and mine development, net	10,651.1	11,082.5
Deferred income taxes	4.9	7.8
Investments and other assets	957.3	1,050.4
Total assets	13,544.7	14,133.4
Current liabilities
Current maturities of long-term debt	21.4	31.7
Liabilities from coal trading activities, net	22.4	6.1
Accounts payable and accrued expenses	1,656.5	1,737.7
Total current liabilities	1,700.3	1,775.5
Long-term debt, less current maturities	5,969.7	5,970.7
Deferred income taxes	16.0	40.9
Asset retirement obligations	724.1	712.8
Accrued postretirement benefit costs	712.4	684.0
Other noncurrent liabilities	827.1	1,001.6
Total liabilities	9,949.6	10,185.5
Stockholders' equity
Additional paid-in capital	2,375.9	2,340.0
Treasury stock, at cost — 14.0 shares as of September 30, 2014 and 13.8 shares as of December 31, 2013	(467.0)	(464.7)
Retained earnings	2,108.2	2,449.8
Accumulated other comprehensive loss	(426.4)	(419.2)
Peabody Energy Corporation stockholders' equity	3,593.6	3,908.7
Noncontrolling interests	1.5	39.2
Total stockholders' equity	3,595.1	3,947.9
Total liabilities and stockholders' equity	13,544.7	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