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Debt Credit Agreement (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 24, 2013
Feb. 05, 2015
Line of Credit Facility [Line Items]          
Proceeds from long-term debt $ 1,100,000us-gaap_ProceedsFromIssuanceOfLongTermDebt $ 1,188,000,000us-gaap_ProceedsFromIssuanceOfLongTermDebt $ 800,000us-gaap_ProceedsFromIssuanceOfLongTermDebt    
Letters of credit outstanding       94,700,000us-gaap_LettersOfCreditOutstandingAmount  
2011 Term Loan Facility [Member]          
Line of Credit Facility [Line Items]          
Previous term loan facility balance       862,500,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= btu_TermLoanFacilityTwoMember
 
Revolving Credit Facility [Member]          
Line of Credit Facility [Line Items]          
Line of credit facility, maximum borrowing capacity 1,650,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
       
Long-term debt, percentage bearing variable interest, percentage rate 2.25%us-gaap_LongTermDebtPercentageBearingVariableInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
       
Capitalized debt issuance costs       18,300,000us-gaap_UnamortizedDebtIssuanceExpense
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
 
Line of credit facility, dividend restrictions 500        
Line of credit facility annual dividend threshold 27.5        
Letters of credit outstanding 114,900,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
       
Line of credit facility, remaining borrowing capacity 1,535,100,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
       
Interest rate at end of period 2.42%us-gaap_DebtInstrumentInterestRateAtPeriodEnd
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
       
Line of credit facility general restricted payments 100.0        
Term Loan Facility [Member]          
Line of Credit Facility [Line Items]          
Previous term loan facility balance       301,800,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= btu_TermLoanFacilityMember
 
Write-off of debt issuance costs 11,500,000us-gaap_WriteOffOfDeferredDebtIssuanceCost
/ us-gaap_LongtermDebtTypeAxis
= btu_TermLoanFacilityMember
       
2013 Term Loan Facility [Member]          
Line of Credit Facility [Line Items]          
Line of credit facility, maximum borrowing capacity 1,200,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= btu_TermLoanFacilityBMember
       
Proceeds from long-term debt 1,190,000,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= btu_TermLoanFacilityBMember
       
Debt instrument, unamortized discount 12,000,000us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= btu_TermLoanFacilityBMember
       
Previous term loan facility balance 1,175,100,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= btu_TermLoanFacilityBMember
1,185,400,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= btu_TermLoanFacilityBMember
     
Capitalized debt issuance costs       10,100,000us-gaap_UnamortizedDebtIssuanceExpense
/ us-gaap_LongtermDebtTypeAxis
= btu_TermLoanFacilityBMember
 
Term loan facility percentage of periodic repayment 0.25%btu_TermLoanFacilityPercentageOfPeriodicRepayment
/ us-gaap_LongtermDebtTypeAxis
= btu_TermLoanFacilityBMember
       
Loan prepayment threshold for certain asset sale net proceeds 500        
Domestic unrestricted subsidiary or domestic joint venture percentage 50.00%btu_DomesticUnrestrictedSubsidiaryOrDomesticJointVenturesPercentage
/ us-gaap_LongtermDebtTypeAxis
= btu_TermLoanFacilityBMember
       
Aggregate net proceeds from domestic unrestricted subsidiaries or domestic joint venture 200        
Interest rate at end of period 4.25%us-gaap_DebtInstrumentInterestRateAtPeriodEnd
/ us-gaap_LongtermDebtTypeAxis
= btu_TermLoanFacilityBMember
       
2013 Credit Facility [Member]          
Line of Credit Facility [Line Items]          
Percent of company stock pledged       65.00%btu_PercentofCompanyStockPledged
/ us-gaap_LongtermDebtTypeAxis
= btu_A2013CreditFacilityMember
 
Fronting fee as a percentage of the face amount of each letter of credit 0.125%btu_FrontingFeeAsPercentageOfFaceAmountOfEachLetterOfCredit
/ us-gaap_LongtermDebtTypeAxis
= btu_A2013CreditFacilityMember
       
6.00% Senior Notes [Member]          
Line of Credit Facility [Line Items]          
Previous term loan facility balance $ 1,518,800,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= btu_SeniorNotesSixMember
$ 1,518,800,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= btu_SeniorNotesSixMember
     
Stated interest rate - percentage 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= btu_SeniorNotesSixMember
       
Maximum [Member] | Revolving Credit Facility [Member]          
Line of Credit Facility [Line Items]          
Maximum line of credit commitment fee percent 0.50%us-gaap_LineOfCreditFacilityCommitmentFeePercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
       
Letter of credit fee as a percentage of the undrawn amount of each letter of credit, higher range 2.50%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
       
Minimum [Member] | Revolving Credit Facility [Member]          
Line of Credit Facility [Line Items]          
Maximum line of credit commitment fee percent 0.38%us-gaap_LineOfCreditFacilityCommitmentFeePercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
       
Letter of credit fee as a percentage of the undrawn amount of each letter of credit, higher range 1.75%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
       
Base Rate [Member] | Maximum [Member] | 2013 Credit Facility [Member]          
Line of Credit Facility [Line Items]          
Debt instrument, basis spread on variable rate 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= btu_A2013CreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
       
Base Rate [Member] | Minimum [Member] | 2013 Credit Facility [Member]          
Line of Credit Facility [Line Items]          
Debt instrument, basis spread on variable rate 0.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= btu_A2013CreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
       
Eurocurrency Rate [Member] | Maximum [Member] | 2013 Credit Facility [Member]          
Line of Credit Facility [Line Items]          
Debt instrument, basis spread on variable rate 2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= btu_A2013CreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= btu_EurocurrencyRateMember
       
Eurocurrency Rate [Member] | Minimum [Member] | 2013 Credit Facility [Member]          
Line of Credit Facility [Line Items]          
Debt instrument, basis spread on variable rate 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= btu_A2013CreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= btu_EurocurrencyRateMember
       
Eurocurrency Rate [Member] | 2013 Term Loan Facility [Member]          
Line of Credit Facility [Line Items]          
Minimum interest rate 1.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ btu_InterestRateTypeAxis
= btu_EurocurrencyRateMember
/ us-gaap_LongtermDebtTypeAxis
= btu_TermLoanFacilityBMember
       
Long-term debt, percentage bearing variable interest, percentage rate 3.25%us-gaap_LongTermDebtPercentageBearingVariableInterestRate
/ btu_InterestRateTypeAxis
= btu_EurocurrencyRateMember
/ us-gaap_LongtermDebtTypeAxis
= btu_TermLoanFacilityBMember
       
Base Rate [Member] | 2013 Term Loan Facility [Member]          
Line of Credit Facility [Line Items]          
Minimum interest rate 2.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ btu_InterestRateTypeAxis
= us-gaap_BaseRateMember
/ us-gaap_LongtermDebtTypeAxis
= btu_TermLoanFacilityBMember
       
Long-term debt, percentage bearing variable interest, percentage rate 2.25%us-gaap_LongTermDebtPercentageBearingVariableInterestRate
/ btu_InterestRateTypeAxis
= us-gaap_BaseRateMember
/ us-gaap_LongtermDebtTypeAxis
= btu_TermLoanFacilityBMember
       
Subsequent Event [Member] | 2013 Credit Facility [Member]          
Line of Credit Facility [Line Items]          
Percentage of Equity Interests of Foreign Subsidiaries         65.00%btu_PercentageofEquityInterestsofForeignSubsidiaries
/ us-gaap_LongtermDebtTypeAxis
= btu_A2013CreditFacilityMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember