Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash Flows From Operating Activities
Net loss	$ (173.3)us-gaap_ProfitLoss	$ (44.1)us-gaap_ProfitLoss
Loss (income) from discontinued operations, net of income taxes	8.9	(0.2)
Loss from continuing operations, net of income taxes	(164.4)	(44.3)
Adjustments to reconcile loss from continuing operations, net of income taxes to net cash provided by operating activities:
Depreciation, depletion and amortization	147.5	157.2
Noncash interest expense	7.3us-gaap_OtherNoncashIncomeExpense	5.9us-gaap_OtherNoncashIncomeExpense
Deferred income taxes	(3.6)	(69.9)
Share-based compensation for equity- and liability-classified awards	9.6us-gaap_ShareBasedCompensation	13.5us-gaap_ShareBasedCompensation
Net gain on disposal of assets	(0.1)us-gaap_GainLossOnDispositionOfAssets1	(9.8)us-gaap_GainLossOnDispositionOfAssets1
Loss from equity affiliates	3.1	6.6
Gains on previously monetized foreign currency hedge positions	(10.7)	(40.9)
Changes in current assets and liabilities:
Accounts receivable	116.1	47.5
Change in receivable from accounts receivable securitization program	15.0	55.0
Inventories	37.5us-gaap_IncreaseDecreaseInInventories	(42.7)us-gaap_IncreaseDecreaseInInventories
Net assets from coal trading activities	(3.8)btu_NetAssetsFromCoalTradingActivities	(5.7)btu_NetAssetsFromCoalTradingActivities
Other current assets	0.1	(5.5)
Accounts payable and accrued expenses	(178.9)	47.1
Asset retirement obligations	11.3	9.5
Accrued postretirement benefit costs	5.3	3.6
Accrued pension costs	7.6us-gaap_PensionExpense	5.4us-gaap_PensionExpense
Other, net	6.3	(5.6)
Net cash provided by continuing operations	5.2	126.9
Net cash used in discontinued operations	(1.8)	(72.8)
Net cash provided by operating activities	3.4	54.1
Cash Flows From Investing Activities
Additions to property, plant, equipment and mine development	(25.1)	(24.4)
Changes in accrued expenses related to capital expenditures	(11.3)	(18.3)
Proceeds from disposal of assets, net of notes receivable	2.1	99.8
Purchases of debt and equity securities	(7.3)	(2.0)
Proceeds from sales and maturities of debt and equity securities	10.1	0.4
Contributions to joint ventures	(114.6)btu_ContributionsToJointVentures	(151.8)btu_ContributionsToJointVentures
Distributions from joint ventures	113.6btu_DistributionsFromJointVentures	138.2btu_DistributionsFromJointVentures
Other, net	(3.2)	(2.2)
Net cash (used in) provided by investing activities	(35.7)	39.7
Cash Flows From Financing Activities
Proceeds from long-term debt	975.7	0
Repayments of long-term debt	(572.2)	(5.2)
Payment of deferred financing costs	(28.4)us-gaap_PaymentsOfDebtIssuanceCosts	0us-gaap_PaymentsOfDebtIssuanceCosts
Dividends paid	(0.7)us-gaap_PaymentsOfDividendsCommonStock	(23.1)us-gaap_PaymentsOfDividendsCommonStock
Other, net	(3.0)	(1.4)
Net cash provided by (used in) financing activities	371.4	(29.7)
Net change in cash and cash equivalents	339.1	64.1
Cash and cash equivalents at beginning of period	298.0	444.0
Cash and cash equivalents at end of period	$ 637.1	$ 508.1

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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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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