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Debt Senior Notes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2012
Dec. 31, 2012
Nov. 15, 2011
Debt Instrument [Line Items]                
Redemption price of senior notes as percentage of principal amount plus a make whole premium and any accrued unpaid interest to the redemption date       100.00%btu_RedemptionPriceOfBondsAsPercentageOfPrincipalAmountPlusMakeWholePremiumAndAnyAccruedUnpaidInterestToRedemptionDate        
Redemption price of senior notes - percentage       101.00%btu_RedemptionPriceOfDebtAsPercentageOfPrincipalAmountOfDebentures        
Gains (Losses) on extinguishment of debt $ (11.5)us-gaap_GainsLossesOnExtinguishmentOfDebt $ (4.5)us-gaap_GainsLossesOnExtinguishmentOfDebt $ (0.9)us-gaap_GainsLossesOnExtinguishmentOfDebt   $ 0us-gaap_GainsLossesOnExtinguishmentOfDebt      
Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Other Borrowings       0us-gaap_OtherBorrowings
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
       
6.00% Senior Notes [Member]                
Debt Instrument [Line Items]                
Face amount of senior notes               1,600.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= btu_SeniorNotesSixMember
Stated interest rate - percentage       6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= btu_SeniorNotesSixMember
       
Repayments of long-term debt           81.2us-gaap_RepaymentsOfLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= btu_SeniorNotesSixMember
   
6.25% Senior Notes [Member]                
Debt Instrument [Line Items]                
Face amount of senior notes               1,500.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= btu_SeniorNotesSevenMember
Stated interest rate - percentage       6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= btu_SeniorNotesSevenMember
       
Repayments of long-term debt           160.4us-gaap_RepaymentsOfLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= btu_SeniorNotesSevenMember
   
Senior Notes Six and Seven [Member]                
Debt Instrument [Line Items]                
Gains (Losses) on extinguishment of debt           0.6us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_LongtermDebtTypeAxis
= btu_SeniorNotesSixAndSevenMember
2.8us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_LongtermDebtTypeAxis
= btu_SeniorNotesSixAndSevenMember
 
Write-off of debt issuance costs           $ 3.4us-gaap_WriteOffOfDeferredDebtIssuanceCost
/ us-gaap_LongtermDebtTypeAxis
= btu_SeniorNotesSixAndSevenMember