Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash Flows From Operating Activities
Net loss	$ (777.3)us-gaap_ProfitLoss	$ (512.6)us-gaap_ProfitLoss	$ (575.1)us-gaap_ProfitLoss
Loss from discontinued operations, net of income taxes	28.2	226.6	104.2
Loss from continuing operations, net of income taxes	(749.1)	(286.0)	(470.9)
Adjustments to reconcile loss from continuing operations, net of income taxes to net cash provided by operating activities:
Depreciation, depletion and amortization	655.7	740.3	663.4
Noncash interest expense	23.6us-gaap_OtherNoncashIncomeExpense	32.0us-gaap_OtherNoncashIncomeExpense	20.7us-gaap_OtherNoncashIncomeExpense
Deferred income taxes	231.9	(434.1)	(2.6)
Share-based compensation	46.8us-gaap_ShareBasedCompensation	50.9us-gaap_ShareBasedCompensation	45.4us-gaap_ShareBasedCompensation
Asset impairment and mine closure costs	154.4	528.3	929.0
Settlement charges related to the Patriot bankruptcy reorganization	0	30.6	0
Net gain on disposal or exchange of assets	(41.4)us-gaap_GainLossOnDispositionOfAssets1	(52.6)us-gaap_GainLossOnDispositionOfAssets1	(17.1)us-gaap_GainLossOnDispositionOfAssets1
Loss from equity affiliates	107.6	40.2	61.2
Monetization of foreign currency hedge positions	0	0	151.8
Gains on previously monetized foreign currency hedge positions	(136.9)	0	0
Changes in current assets and liabilities:
Accounts receivable	55.4	104.8	285.3
Change in receivable from accounts receivable securitization program	(70.0)	75.0	(125.0)
Inventories	104.9us-gaap_IncreaseDecreaseInInventories	39.9us-gaap_IncreaseDecreaseInInventories	(112.9)us-gaap_IncreaseDecreaseInInventories
Net assets from coal trading activities	(10.1)btu_NetAssetsFromCoalTradingActivities	(83.7)btu_NetAssetsFromCoalTradingActivities	125.2btu_NetAssetsFromCoalTradingActivities
Other current assets	7.7	3.1	10.3
Accounts payable and accrued expenses	(29.2)	(108.9)	(87.8)
Asset retirement obligations	60.3	45.5	46.4
Workers' compensation obligations	2.2	7.3	9.4
Accrued postretirement benefit costs	9.6	17.0	38.9
Accrued pension costs	28.3us-gaap_PensionExpense	51.8us-gaap_PensionExpense	32.4us-gaap_PensionExpense
Other, net	(10.7)	(21.3)	(3.3)
Net cash provided by continuing operations	441.0	780.1	1,599.8
Net cash used in discontinued operations	(104.4)	(57.7)	(84.7)
Net cash provided by operating activities	336.6	722.4	1,515.1
Cash Flows From Investing Activities
Additions to property, plant, equipment and mine development	(194.4)	(328.4)	(986.0)
Changes in accrued expenses related to capital expenditures	(16.6)	(120.7)	104.7
Federal coal lease expenditures	(276.7)btu_FederalCoalLeaseExpenditure	(276.8)btu_FederalCoalLeaseExpenditure	(276.5)btu_FederalCoalLeaseExpenditure
Investment in Prairie State Energy Campus	0	0	(10.7)
Proceeds from disposal of assets, net of notes receivable	203.7	178.3	147.9
Purchases of debt and equity securities	(15.1)	(22.8)	(46.7)
Proceeds from sales and maturities of debt and equity securities	13.5	22.9	46.4
Purchases of short-term investments	0	0	(4.8)
Maturity of short-term investments	0	4.8	0
Contributions to joint ventures	(529.8)btu_ContributionsToJointVentures	(671.7)btu_ContributionsToJointVentures	(824.0)btu_ContributionsToJointVentures
Distributions from joint ventures	534.2btu_DistributionsFromJointVentures	722.9btu_DistributionsFromJointVentures	823.0btu_DistributionsFromJointVentures
Advances to related parties	(33.7)	(42.1)	(148.0)
Repayment of loans from related parties	5.4	25.2	110.8
Other, net	(5.0)	(5.8)	(6.2)
Net cash used in continuing operations	(314.5)	(514.2)	(1,070.1)
Net cash used in discontinued operations	0	(1.5)	(22.0)
Net cash used in investing activities	(314.5)	(515.7)	(1,092.1)
Cash Flows From Financing Activities
Proceeds from long-term debt	1.1	1,188.0	0.8
Repayments of long-term debt	(21.0)	(1,390.2)	(415.8)
Payment of deferred financing costs	(10.1)us-gaap_PaymentsOfDebtIssuanceCosts	(22.8)us-gaap_PaymentsOfDebtIssuanceCosts	(6.9)us-gaap_PaymentsOfDebtIssuanceCosts
Dividends paid	(92.3)us-gaap_PaymentsOfDividendsCommonStock	(91.7)us-gaap_PaymentsOfDividendsCommonStock	(91.9)us-gaap_PaymentsOfDividendsCommonStock
Common stock repurchase	0	0	(99.9)
Excess tax benefit related to share-based compensation	0	0	8.3
Acquisition of MCG Coal Holdings Pty Ltd noncontrolling interests	0	0	(49.8)
Restricted cash for distributions to noncontrolling interests	(42.5)	0	0
Other, net	(3.3)	(4.8)	(8.1)
Net cash used in financing activities	(168.1)	(321.5)	(663.3)
Net change in cash and cash equivalents	(146.0)	(114.8)	(240.3)
Cash and cash equivalents at beginning of year	444.0	558.8	799.1
Cash and cash equivalents at end of year	$ 298.0	$ 444.0	$ 558.8

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Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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Increase in noncontrolling interest balance because of a business combination that occurred during the period.

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Other income (expense) included in net income that results in no cash inflows or outflows in the period. Includes noncash adjustments to reconcile net income (loss) to cash provided by (used in) operating activities that are not separately disclosed.

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Other cash or noncash adjustments to reconcile net income to cash provided by (used in) operating activities that are not separately disclosed in the statement of cash flows (for example, cash received or cash paid during the current period for miscellaneous operating activities, net change during the reporting period in other assets or other liabilities).

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The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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The cash outflow to reacquire common stock during the period.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group.

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Cash outflow for purchase of trading, available-for-sale securities and held-to-maturity securities.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash outflow for securities or other assets acquired, which qualify for treatment as an investing activity and are to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

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The amount of pension benefit costs recognized during the period for (1) defined benefit plans and (2) defined contribution plans. For defined benefit plans, pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain (loss) on plan assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. For defined contribution plans, the pension expense generally equals the firm's contribution to employees' accounts (if the firm contributes) during the period.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The cash inflow from maturities, prepayments, calls and collections of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

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The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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The net cash inflow or outflow from cash and cash items that are not available for withdrawal or usage.

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The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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The cash outflow associated with security instruments that either represent a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes repayments of (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c).

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Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan and expenses resulting from the write-down of assets. Excludes expenses related to a business combination, a discontinued operation or an asset retirement obligation.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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