XML 80 R66.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Intangible Contract Assets and Liabilities - Textuals (Details) - Fresh Start Reporting - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2018 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Apr. 03, 2017
Sales Contracts |  |  |  |  |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  | $ 314.9
Liabilities |  |  |  |  |  |  |  |  |  |  | 58.7
Intangible liabilities |  |  |  |  |  |  |  |  |  |  | $ 116.2
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets and liabilities | $ 24.0 | $ 41.5 | $ 71.2 | $ 78.4 |  |  |  |  |  |  |
Take-or-pay contracts |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |
Amortization of Intangible Liabilities | $ 5.4 | $ 6.5 | $ 16.4 | $ 21.5 |  |  |  |  |  |  |
Scenario, Forecast | Sales Contracts |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |
Amortization, remainder of 2018 |  |  |  |  |  |  |  |  |  | $ 19.0 |
Amortization, 2019 |  |  |  |  |  |  |  |  | $ 26.0 |  |
Amortization, 2020 |  |  |  |  |  |  |  | $ 8.0 |  |  |
Amortization, 2021 |  |  |  |  |  |  | $ 3.0 |  |  |  |
Amortization, 2022 |  |  |  |  |  | $ 1.0 |  |  |  |  |
Scenario, Forecast | Take-or-pay contracts |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible liabilities, remainder of 2018 |  |  |  |  |  |  |  |  |  | $ 5.0 |
Amortization of intangible liabilities, 2019 |  |  |  |  |  |  |  |  | $ 17.0 |  |
Amortization of intangible liabilities, 2020 |  |  |  |  |  |  |  | $ 9.0 |  |  |
Amortization of intangible liabilities, 2021 |  |  |  |  |  |  | $ 4.0 |  |  |  |
Amortization of intangible liabilities, 2022 |  |  |  |  |  | $ 3.0 |  |  |  |  |
Finite-Lived Intangible Liabilities, Amortization Expense, Beyond Five Years |  |  |  |  | $ 26.0 |  |  |  |  |  |

X
- Definition Amortization Of Intangible Liabilities + References No definition available. + Details
Name: | btu_AmortizationOfIntangibleLiabilities
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Finite-Lived Intangible Liabilities, Amortization Expense, Beyond Five Years + References No definition available. + Details
Name: | btu_FiniteLivedIntangibleLiabilitiesAmortizationExpenseBeyondFiveYears
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Finite-Lived Intangible Liabilities, Amortization Expense, Remainder of Fiscal Year + References No definition available. + Details
Name: | btu_FiniteLivedIntangibleLiabilitiesAmortizationExpenseRemainderofFiscalYear
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Finite-Lived Intangible Liabilities, Amortization Expense, Year Five + References No definition available. + Details
Name: | btu_FiniteLivedIntangibleLiabilitiesAmortizationExpenseYearFive
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Finite-Lived Intangible Liabilities, Amortization Expense, Year Four + References No definition available. + Details
Name: | btu_FiniteLivedIntangibleLiabilitiesAmortizationExpenseYearFour
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Finite-Lived Intangible Liabilities, Amortization Expense, Year Three + References No definition available. + Details
Name: | btu_FiniteLivedIntangibleLiabilitiesAmortizationExpenseYearThree
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Finite-Lived Intangible Liabilities, Amortization Expense, Year Two + References No definition available. + Details
Name: | btu_FiniteLivedIntangibleLiabilitiesAmortizationExpenseYearTwo
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Intangible Liabilities, Gross + References No definition available. + Details
Name: | btu_IntangibleLiabilitiesGross
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
Name: | us-gaap_AmortizationOfIntangibleAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
Name: | us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
Name: | us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
Name: | us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
Name: | us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FreshStartAdjustmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount before accumulated amortization of intangible assets, excluding goodwill. + References No definition available. + Details
Name: | us-gaap_IntangibleAssetsGrossExcludingGoodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19-26) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_Liabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_CoalSupplyAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FreshStartAdjustmentsTypeOfFreshStartAdjustmentAxis=btu_FreshStartReportingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | btu_FiniteLivedIntangibleLiabilityByMajorClassAxis=btu_TakeOrPayContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |