Supplemental Guarantor/Non-Guarantor Financial Information (Details 1) - USD ($) $ in Millions	3 Months Ended								9 Months Ended	12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Apr. 12, 2016	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Net (loss) income	$ (188.3)	$ (135.8)	$ (226.2)	$ (171.1)	$ (474.3)	$ (283.9)	$ (1,042.3)	$ (157.7)	$ (477.2)	$ (721.4)	$ (1,958.2)	$ (723.5)
Current assets
Cash and cash equivalents	872.3				261.3				872.3	872.3	261.3	298.0	$ 652.1	$ 444.0
Restricted Cash and Investments, Current	54.3				0.0				54.3	54.3	0.0
Accounts receivable, net	473.0				228.8				473.0	473.0	228.8
Receivables from affiliates, net	0.0				0.0				0.0	0.0	0.0
Inventories	203.7				307.8				203.7	203.7	307.8
Assets from coal trading activities, net	0.7				23.5				0.7	0.7	23.5
Deferred income taxes	0.0				53.5				0.0	0.0	53.5
Other current assets	486.6				447.6				486.6	486.6	447.6
Total current assets	2,090.6				1,322.5				2,090.6	2,090.6	1,322.5
Property, plant, equipment and mine development, net	8,776.7				9,258.5				8,776.7	8,776.7	9,258.5	10,577.3
Deferred income taxes	0.0				2.2				0.0	0.0	2.2
Investments and other assets	910.4				363.7				910.4	910.4	363.7
Notes receivable from affiliates, net	0.0				0.0				0.0	0.0	0.0
Total assets	11,777.7				10,946.9				11,777.7	11,777.7	10,946.9	13,191.1
Current liabilities
Current portion of long-term debt	20.2				5,874.9				20.2	20.2	5,874.9
Payables to affiliates, net	0.0				0.0				0.0	0.0	0.0
Taxes Payable, Current	6.2								6.2	6.2
Deferred Tax Liabilities, Net, Current					3.8						3.8
Liabilities from coal trading activities, net	1.2				15.6				1.2	1.2	15.6
Accounts Payable and Accrued Liabilities, Current	990.4				1,446.3				990.4	990.4	1,446.3
Accounts Payable and Other Accrued Liabilities, Current	984.2				1,442.5				984.2	984.2	1,442.5
Total current liabilities	1,011.8				7,336.8				1,011.8	1,011.8	7,336.8
Long-term debt, less current portion	0.0				366.3				0.0	0.0	366.3
Deferred income taxes	173.9				235.9				173.9	173.9	235.9	0.0
Notes payable to affiliates, net	0.0				0.0				0.0	0.0	0.0
Other noncurrent liabilities	1,970.3				2,256.2				1,970.3	1,970.3	2,256.2
Total liabilities not subject to compromise	3,156.0				10,195.2				3,156.0	3,156.0	10,195.2
Total liabilities	11,596.2				10,195.2				11,596.2	11,596.2	10,195.2
Peabody Energy Corporation's stockholders' equity	173.9				750.1				173.9	173.9	750.1
Noncontrolling interests	7.6				1.6				7.6	7.6	1.6
Total stockholders' equity	181.5				751.7				181.5	181.5	751.7	2,529.0		3,696.6
Total liabilities and stockholders' equity	11,777.7				10,946.9				11,777.7	11,777.7	10,946.9
Liabilities Subject to Compromise	8,440.2				0.0				8,440.2	8,440.2	0.0
Net change in unrealized losses on available-for-sale securities										0.0	0.0	(0.8)
Decrease in fair value of cash flow hedges										0.0	(131.3)	(195.0)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax										(146.3)	(251.7)	10.2
Net unrealized gains (losses) on cash flow hedges										146.3	120.4	(205.2)
Net actuarial (loss) gain for the period										(13.5)	18.1	(142.7)
Amortization of actuarial loss and prior service cost included in net loss										15.4	31.9	32.7
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax										2.6	(60.4)	98.6
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax										(1.8)	(34.9)	(41.0)
Other comprehensive income from investment in subsidiaries										0.0	0.0	0.0
Other Comprehensive Income (Loss), Net of Tax										141.9	145.9	(345.6)
Comprehensive loss										(579.5)	(1,812.3)	(1,069.1)
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest										7.9	7.1	9.7
Comprehensive loss attributable to common stockholders										(587.4)	(1,819.4)	(1,078.8)
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Net (loss) income										(729.3)	(1,965.3)	(733.2)
Current assets
Cash and cash equivalents	266.6				7.2				266.6	266.6	7.2	188.7		300.7
Restricted Cash and Investments, Current	13.8								13.8	13.8
Accounts receivable, net	0.0				0.0				0.0	0.0	0.0
Receivables from affiliates, net	899.9				582.1				899.9	899.9	582.1
Inventories	0.0				0.0				0.0	0.0	0.0
Assets from coal trading activities, net	0.0				0.0				0.0	0.0	0.0
Deferred income taxes					0.0						0.0
Other current assets	19.1				23.1				19.1	19.1	23.1
Total current assets	1,199.4				612.4				1,199.4	1,199.4	612.4
Property, plant, equipment and mine development, net	0.0				0.0				0.0	0.0	0.0
Deferred income taxes	0.0				0.0				0.0	0.0	0.0
Investments and other assets	8,495.7				8,309.4				8,495.7	8,495.7	8,309.4
Notes receivable from affiliates, net	0.0				0.0				0.0	0.0	0.0
Total assets	9,695.1				8,921.8				9,695.1	9,695.1	8,921.8
Current liabilities
Current portion of long-term debt	0.0				5,844.0				0.0	0.0	5,844.0
Payables to affiliates, net	0.0				0.0				0.0	0.0	0.0
Deferred Tax Liabilities, Net, Current					11.8						11.8
Liabilities from coal trading activities, net	0.0				0.0				0.0	0.0	0.0
Accounts Payable and Accrued Liabilities, Current					494.8						494.8
Accounts Payable and Other Accrued Liabilities, Current	58.9								58.9	58.9
Total current liabilities	58.9				6,350.6				58.9	58.9	6,350.6
Long-term debt, less current portion					366.3						366.3
Deferred income taxes	28.0				98.6				28.0	28.0	98.6
Notes payable to affiliates, net	1,032.5				1,032.6				1,032.5	1,032.5	1,032.6
Other noncurrent liabilities	160.4				323.6				160.4	160.4	323.6
Total liabilities not subject to compromise	1,279.8								1,279.8	1,279.8
Total liabilities	9,521.2				8,171.7				9,521.2	9,521.2	8,171.7
Peabody Energy Corporation's stockholders' equity	173.9				750.1				173.9	173.9	750.1
Noncontrolling interests	0.0				0.0				0.0	0.0	0.0
Total stockholders' equity	173.9				750.1				173.9	173.9	750.1
Total liabilities and stockholders' equity	9,695.1				8,921.8				9,695.1	9,695.1	8,921.8
Liabilities Subject to Compromise	8,241.4								8,241.4	8,241.4
Net change in unrealized losses on available-for-sale securities												(0.8)
Decrease in fair value of cash flow hedges										0.0	(137.1)	(225.9)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax										(146.3)	(292.1)	(31.3)
Net unrealized gains (losses) on cash flow hedges										146.3	155.0	(194.6)
Net actuarial (loss) gain for the period										8.9	5.5	0.0
Amortization of actuarial loss and prior service cost included in net loss										(6.1)	7.2	0.0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax										(2.8)	(12.7)	0.0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax										0.0	0.0	0.0
Other comprehensive income from investment in subsidiaries										(7.2)	(21.8)	(150.2)
Other Comprehensive Income (Loss), Net of Tax										141.9	145.9	(345.6)
Comprehensive loss										(587.4)	(1,819.4)	(1,078.8)
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest										0.0	0.0	0.0
Comprehensive loss attributable to common stockholders										(587.4)	(1,819.4)	(1,078.8)
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net (loss) income										179.4	152.7	359.9
Current assets
Cash and cash equivalents	107.0				4.7				107.0	107.0	4.7	1.2		0.3
Restricted Cash and Investments, Current	0.0								0.0	0.0
Accounts receivable, net	5.1				12.1				5.1	5.1	12.1
Receivables from affiliates, net	0.0				0.0				0.0	0.0	0.0
Inventories	76.8				109.4				76.8	76.8	109.4
Assets from coal trading activities, net	0.9				3.2				0.9	0.9	3.2
Deferred income taxes					65.3						65.3
Other current assets	51.2				128.1				51.2	51.2	128.1
Total current assets	241.0				322.8				241.0	241.0	322.8
Property, plant, equipment and mine development, net	4,381.6				4,304.8				4,381.6	4,381.6	4,304.8
Deferred income taxes	15.8				33.1				15.8	15.8	33.1
Investments and other assets	3.8				3.6				3.8	3.8	3.6
Notes receivable from affiliates, net	1,036.3				632.7				1,036.3	1,036.3	632.7
Total assets	5,678.5				5,297.0				5,678.5	5,678.5	5,297.0
Current liabilities
Current portion of long-term debt	19.3				23.8				19.3	19.3	23.8
Payables to affiliates, net	1,682.9				1,530.2				1,682.9	1,682.9	1,530.2
Deferred Tax Liabilities, Net, Current					0.0						0.0
Liabilities from coal trading activities, net	0.0				4.8				0.0	0.0	4.8
Accounts Payable and Accrued Liabilities, Current					479.8						479.8
Accounts Payable and Other Accrued Liabilities, Current	439.3								439.3	439.3
Total current liabilities	2,141.5				2,038.6				2,141.5	2,141.5	2,038.6
Long-term debt, less current portion					0.0						0.0
Deferred income taxes	0.0				0.0				0.0	0.0	0.0
Notes payable to affiliates, net	0.0				0.0				0.0	0.0	0.0
Other noncurrent liabilities	1,330.3				1,454.9				1,330.3	1,330.3	1,454.9
Total liabilities not subject to compromise	3,471.8								3,471.8	3,471.8
Total liabilities	3,656.0				3,493.5				3,656.0	3,656.0	3,493.5
Peabody Energy Corporation's stockholders' equity	2,022.5				1,803.5				2,022.5	2,022.5	1,803.5
Noncontrolling interests	0.0				0.0				0.0	0.0	0.0
Total stockholders' equity	2,022.5				1,803.5				2,022.5	2,022.5	1,803.5
Total liabilities and stockholders' equity	5,678.5				5,297.0				5,678.5	5,678.5	5,297.0
Liabilities Subject to Compromise	184.2								184.2	184.2
Net change in unrealized losses on available-for-sale securities												0.0
Decrease in fair value of cash flow hedges										0.0	0.0	0.0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax										0.0	0.0	0.0
Net unrealized gains (losses) on cash flow hedges										0.0	0.0	0.0
Net actuarial (loss) gain for the period										(22.4)	12.6	(152.6)
Amortization of actuarial loss and prior service cost included in net loss										21.5	37.3	41.4
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax										5.4	(60.3)	99.8
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax										0.0	0.0	0.0
Other comprehensive income from investment in subsidiaries										0.0	0.0	0.0
Other Comprehensive Income (Loss), Net of Tax										(5.4)	60.3	(99.8)
Comprehensive loss										174.0	213.0	260.1
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest										0.0	0.8	5.2
Comprehensive loss attributable to common stockholders										174.0	212.2	254.9
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net (loss) income										(346.0)	(1,048.8)	(424.9)
Current assets
Cash and cash equivalents	498.7				249.4				498.7	498.7	249.4	108.1		143.0
Restricted Cash and Investments, Current	40.5								40.5	40.5
Accounts receivable, net	467.9				216.7				467.9	467.9	216.7
Receivables from affiliates, net	783.0				948.1				783.0	783.0	948.1
Inventories	126.9				198.4				126.9	126.9	198.4
Assets from coal trading activities, net	0.0				20.3				0.0	0.0	20.3
Deferred income taxes					0.0						0.0
Other current assets	416.3				296.4				416.3	416.3	296.4
Total current assets	2,333.3				1,929.3				2,333.3	2,333.3	1,929.3
Property, plant, equipment and mine development, net	4,395.1				4,953.7				4,395.1	4,395.1	4,953.7
Deferred income taxes	0.0				0.0				0.0	0.0	0.0
Investments and other assets	626.5				185.5				626.5	626.5	185.5
Notes receivable from affiliates, net	0.0				399.9				0.0	0.0	399.9
Total assets	7,354.9				7,468.4				7,354.9	7,354.9	7,468.4
Current liabilities
Current portion of long-term debt	0.9				7.1				0.9	0.9	7.1
Payables to affiliates, net	0.0				0.0				0.0	0.0	0.0
Deferred Tax Liabilities, Net, Current					3.8						3.8
Liabilities from coal trading activities, net	1.4				10.8				1.4	1.4	10.8
Accounts Payable and Accrued Liabilities, Current					467.9						467.9
Accounts Payable and Other Accrued Liabilities, Current	492.2								492.2	492.2
Total current liabilities	494.5				489.6				494.5	494.5	489.6
Long-term debt, less current portion					0.0						0.0
Deferred income taxes	161.7				168.2				161.7	161.7	168.2
Notes payable to affiliates, net	3.8				0.0				3.8	3.8	0.0
Other noncurrent liabilities	479.6				477.7				479.6	479.6	477.7
Total liabilities not subject to compromise	1,139.6								1,139.6	1,139.6
Total liabilities	1,154.2				1,135.5				1,154.2	1,154.2	1,135.5
Peabody Energy Corporation's stockholders' equity	6,193.1				6,331.3				6,193.1	6,193.1	6,331.3
Noncontrolling interests	7.6				1.6				7.6	7.6	1.6
Total stockholders' equity	6,200.7				6,332.9				6,200.7	6,200.7	6,332.9
Total liabilities and stockholders' equity	7,354.9				7,468.4				7,354.9	7,354.9	7,468.4
Liabilities Subject to Compromise	14.6								14.6	14.6
Net change in unrealized losses on available-for-sale securities												0.0
Decrease in fair value of cash flow hedges										0.0	5.8	30.9
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax										0.0	40.4	41.5
Net unrealized gains (losses) on cash flow hedges										0.0	(34.6)	(10.6)
Net actuarial (loss) gain for the period										0.0	0.0	9.9
Amortization of actuarial loss and prior service cost included in net loss										0.0	(12.6)	(8.7)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax										0.0	12.6	(1.2)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax										(1.8)	(34.9)	(41.0)
Other comprehensive income from investment in subsidiaries										0.0	0.0	0.0
Other Comprehensive Income (Loss), Net of Tax										(1.8)	(82.1)	(50.4)
Comprehensive loss										(347.8)	(1,130.9)	(475.3)
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest										7.9	6.3	4.5
Comprehensive loss attributable to common stockholders										(355.7)	(1,137.2)	(479.8)
Debtor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net (loss) income									(485.1)
Current assets
Cash and cash equivalents	394.5								394.5	394.5			108.5
Restricted Cash and Investments, Current	13.8								13.8	13.8
Accounts receivable, net	5.2								5.2	5.2
Receivables from affiliates, net	226.9								226.9	226.9
Inventories	96.3								96.3	96.3
Assets from coal trading activities, net	0.9								0.9	0.9
Deferred income taxes	0.0								0.0	0.0
Other current assets	72.0								72.0	72.0
Total current assets	809.6								809.6	809.6
Property, plant, equipment and mine development, net	4,870.2								4,870.2	4,870.2
Deferred income taxes	0.0								0.0	0.0
Investments and other assets	4,125.9								4,125.9	4,125.9
Notes receivable from affiliates, net	1,036.3								1,036.3	1,036.3
Total assets	10,842.0								10,842.0	10,842.0
Current liabilities
Current portion of long-term debt	19.3								19.3	19.3
Payables to affiliates, net	0.0								0.0	0.0
Taxes Payable, Current	0.0								0.0	0.0
Liabilities from coal trading activities, net	0.1								0.1	0.1
Accounts Payable and Other Accrued Liabilities, Current	541.7								541.7	541.7
Total current liabilities	561.1								561.1	561.1
Deferred income taxes	12.1								12.1	12.1
Notes payable to affiliates, net	0.0								0.0	0.0
Other noncurrent liabilities	1,648.8								1,648.8	1,648.8
Total liabilities not subject to compromise	2,222.0								2,222.0	2,222.0
Total liabilities	10,662.2								10,662.2	10,662.2
Peabody Energy Corporation's stockholders' equity	179.8								179.8	179.8
Noncontrolling interests	0.0								0.0	0.0
Total stockholders' equity	179.8								179.8	179.8
Total liabilities and stockholders' equity	10,842.0								10,842.0	10,842.0
Liabilities Subject to Compromise	8,440.2								8,440.2	8,440.2
Non-Debtor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net (loss) income									(201.7)
Current assets
Cash and cash equivalents	477.8								477.8	477.8			$ 543.6
Restricted Cash and Investments, Current	40.5								40.5	40.5
Accounts receivable, net	467.8								467.8	467.8
Receivables from affiliates, net	0.0								0.0	0.0
Inventories	107.4								107.4	107.4
Assets from coal trading activities, net	0.0								0.0	0.0
Deferred income taxes	0.0								0.0	0.0
Other current assets	416.2								416.2	416.2
Total current assets	1,509.7								1,509.7	1,509.7
Property, plant, equipment and mine development, net	3,906.5								3,906.5	3,906.5
Deferred income taxes	0.0								0.0	0.0
Investments and other assets	596.7								596.7	596.7
Notes receivable from affiliates, net	0.0								0.0	0.0
Total assets	6,012.9								6,012.9	6,012.9
Current liabilities
Current portion of long-term debt	0.9								0.9	0.9
Payables to affiliates, net	226.9								226.9	226.9
Taxes Payable, Current	7.8								7.8	7.8
Liabilities from coal trading activities, net	1.3								1.3	1.3
Accounts Payable and Other Accrued Liabilities, Current	442.5								442.5	442.5
Total current liabilities	679.4								679.4	679.4
Deferred income taxes	161.8								161.8	161.8
Notes payable to affiliates, net	1,036.3								1,036.3	1,036.3
Other noncurrent liabilities	321.5								321.5	321.5
Total liabilities not subject to compromise	2,199.0								2,199.0	2,199.0
Total liabilities	2,199.0								2,199.0	2,199.0
Peabody Energy Corporation's stockholders' equity	3,806.3								3,806.3	3,806.3
Noncontrolling interests	7.6								7.6	7.6
Total stockholders' equity	3,813.9								3,813.9	3,813.9
Total liabilities and stockholders' equity	6,012.9								6,012.9	6,012.9
Liabilities Subject to Compromise	0.0								0.0	0.0
Consolidation, Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net (loss) income										174.5	903.2	74.7
Current assets
Cash and cash equivalents	0.0				0.0				0.0	0.0	0.0
Restricted Cash and Investments, Current	0.0								0.0	0.0
Accounts receivable, net	0.0				0.0				0.0	0.0	0.0
Receivables from affiliates, net	(1,682.9)				(1,530.2)				(1,682.9)	(1,682.9)	(1,530.2)
Inventories	0.0				0.0				0.0	0.0	0.0
Assets from coal trading activities, net	(0.2)				0.0				(0.2)	(0.2)	0.0
Deferred income taxes					(11.8)						(11.8)
Other current assets	0.0				0.0				0.0	0.0	0.0
Total current assets	(1,683.1)				(1,542.0)				(1,683.1)	(1,683.1)	(1,542.0)
Property, plant, equipment and mine development, net	0.0				0.0				0.0	0.0	0.0
Deferred income taxes	(15.8)				(30.9)				(15.8)	(15.8)	(30.9)
Investments and other assets	(8,215.6)				(8,134.8)				(8,215.6)	(8,215.6)	(8,134.8)
Notes receivable from affiliates, net	(1,036.3)				(1,032.6)				(1,036.3)	(1,036.3)	(1,032.6)
Total assets	(10,950.8)				(10,740.3)				(10,950.8)	(10,950.8)	(10,740.3)
Current liabilities
Current portion of long-term debt	0.0				0.0				0.0	0.0	0.0
Payables to affiliates, net	(1,682.9)				(1,530.2)				(1,682.9)	(1,682.9)	(1,530.2)
Deferred Tax Liabilities, Net, Current					(11.8)						(11.8)
Liabilities from coal trading activities, net	(0.2)				0.0				(0.2)	(0.2)	0.0
Accounts Payable and Accrued Liabilities, Current					0.0						0.0
Accounts Payable and Other Accrued Liabilities, Current	0.0								0.0	0.0
Total current liabilities	(1,683.1)				(1,542.0)				(1,683.1)	(1,683.1)	(1,542.0)
Long-term debt, less current portion					0.0						0.0
Deferred income taxes	(15.8)				(30.9)				(15.8)	(15.8)	(30.9)
Notes payable to affiliates, net	(1,036.3)				(1,032.6)				(1,036.3)	(1,036.3)	(1,032.6)
Other noncurrent liabilities	0.0				0.0				0.0	0.0	0.0
Total liabilities not subject to compromise	(2,735.2)								(2,735.2)	(2,735.2)
Total liabilities	(2,735.2)				(2,605.5)				(2,735.2)	(2,735.2)	(2,605.5)
Peabody Energy Corporation's stockholders' equity	(8,215.6)				(8,134.8)				(8,215.6)	(8,215.6)	(8,134.8)
Noncontrolling interests	0.0				0.0				0.0	0.0	0.0
Total stockholders' equity	(8,215.6)				(8,134.8)				(8,215.6)	(8,215.6)	(8,134.8)
Total liabilities and stockholders' equity	(10,950.8)				(10,740.3)				(10,950.8)	(10,950.8)	(10,740.3)
Liabilities Subject to Compromise	0.0								0.0	0.0
Net change in unrealized losses on available-for-sale securities												0.0
Decrease in fair value of cash flow hedges										0.0	0.0	0.0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax										0.0	0.0	0.0
Net unrealized gains (losses) on cash flow hedges										0.0	0.0	0.0
Net actuarial (loss) gain for the period										0.0	0.0	0.0
Amortization of actuarial loss and prior service cost included in net loss										0.0	0.0	0.0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax										0.0	0.0	0.0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax										0.0	0.0	0.0
Other comprehensive income from investment in subsidiaries										7.2	21.8	150.2
Other Comprehensive Income (Loss), Net of Tax										7.2	21.8	150.2
Comprehensive loss										181.7	925.0	224.9
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest										0.0	0.0	0.0
Comprehensive loss attributable to common stockholders										181.7	925.0	224.9
Debtor Non-Debtor Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net (loss) income									209.6
Current assets
Cash and cash equivalents	0.0								0.0	0.0
Restricted Cash and Investments, Current	0.0								0.0	0.0
Accounts receivable, net	0.0								0.0	0.0
Receivables from affiliates, net	(226.9)								(226.9)	(226.9)
Inventories	0.0								0.0	0.0
Assets from coal trading activities, net	(0.2)								(0.2)	(0.2)
Deferred income taxes	0.0								0.0	0.0
Other current assets	(1.6)								(1.6)	(1.6)
Total current assets	(228.7)								(228.7)	(228.7)
Property, plant, equipment and mine development, net	0.0								0.0	0.0
Deferred income taxes	0.0								0.0	0.0
Investments and other assets	(3,812.2)								(3,812.2)	(3,812.2)
Notes receivable from affiliates, net	(1,036.3)								(1,036.3)	(1,036.3)
Total assets	(5,077.2)								(5,077.2)	(5,077.2)
Current liabilities
Current portion of long-term debt	0.0								0.0	0.0
Payables to affiliates, net	(226.9)								(226.9)	(226.9)
Taxes Payable, Current	(1.6)								(1.6)	(1.6)
Liabilities from coal trading activities, net	(0.2)								(0.2)	(0.2)
Accounts Payable and Other Accrued Liabilities, Current	0.0								0.0	0.0
Total current liabilities	(228.7)								(228.7)	(228.7)
Notes payable to affiliates, net	(1,036.3)								(1,036.3)	(1,036.3)
Other noncurrent liabilities	0.0								0.0	0.0
Total liabilities not subject to compromise	(1,265.0)								(1,265.0)	(1,265.0)
Total liabilities	(1,265.0)								(1,265.0)	(1,265.0)
Peabody Energy Corporation's stockholders' equity	(3,812.2)								(3,812.2)	(3,812.2)
Noncontrolling interests	0.0								0.0	0.0
Total stockholders' equity	(3,812.2)								(3,812.2)	(3,812.2)
Total liabilities and stockholders' equity	(5,077.2)								(5,077.2)	(5,077.2)
Liabilities Subject to Compromise	0.0								0.0	0.0
Noncontrolling Interest [Member]
Current liabilities
Total stockholders' equity	$ 7.6				$ 1.6				$ 7.6	$ 7.6	$ 1.6	$ 1.7		$ 39.2