XML 69 R69.htm IDEA: XBRL DOCUMENT
v3.20.1

Other Events (Details) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 employees | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) | Jun. 18, 2019
Other Commercial Events [Line Items] |  |  |  |  |  |
Restructuring Charges |  | $ 6.5 | $ 0.2 |  |  |
Provision for North Goonyella equipment loss |  | 0.0 | 24.7 | $ 66.4 |  |
Carrying value of longwall |  | 4,607.8 |  |  | $ 4,679.1 |
Insurance recovery related to North Goonyella equipment losses |  | 0.0 | 125.0 |  |  |
Proceeds from Sale of Property, Plant, and Equipment |  | 10.5 | 11.0 |  |  |
Net gain on disposals |  | $ 8.1 | 1.5 |  |  |
Interest in unincorporated joint venture project |  | 50.00% |  |  |  |
At-risk carrying value |  | $ 2,100.0 |  |  |  |
Other US Mining Operations [Member] |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |
Asset impairment charges |  | 0.0 |  |  |  |
North Goonyella Mine |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |
Costs Related to North Goonyella Events |  | 10.1 | 36.9 |  |  |
Containment and idling costs |  |  | 9.0 |  |  |
Insurance recovery related to North Goonyella equipment losses |  | 125.0 |  |  |  |
Deductible Amount |  | 50.0 |  |  |  |
North Goonyella Mine | Mine Carrying Value |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |
Costs Related to North Goonyella Events |  | 300.0 |  |  |  |
Wildcat Hills Underground [Member] |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |
Asset impairment charges |  | $ 0.0 | $ 0.0 |  |  |
Scenario, Forecast |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |
Number of employees resulting from workforce reduction | employees | 250 |  |  |  |  |
PRB Colorado Joint Venture [Member] |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |
Joint Venture Ownership Percentage by Parent |  |  |  |  |  | 66.50%
Joint Venture Ownership Percentage by Noncontrolling Owners |  |  |  |  |  | 33.50%

X
- Definition At-risk assets + References No definition available. + Details
Name: | btu_Atriskassets
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Containment and idling costs + References No definition available. + Details
Name: | btu_Containmentandidlingcosts
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Costs Related to North Goonyella Events + References No definition available. + Details
Name: | btu_CostsRelatedtoNorthGoonyellaEvents
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Deductible Amount + References No definition available. + Details
Name: | btu_DeductibleAmount
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Interest in unincorporated joint venture project + References No definition available. + Details
Name: | btu_Interestinunincorporatedjointventureproject
Namespace Prefix: | btu_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of employees resulting from workforce reduction + References No definition available. + Details
Name: | btu_Numberofemployeesresultingfromworkforcereduction
Namespace Prefix: | btu_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition [Line Items] for Other Commercial Events [Table] + References No definition available. + Details
Name: | btu_OtherCommercialEventsLineItems
Namespace Prefix: | btu_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Provision for equipment loss + References No definition available. + Details
Name: | btu_Provisionforequipmentloss
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
Name: | us-gaap_AssetImpairmentCharges
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
Name: | us-gaap_GainLossOnDispositionOfAssets1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
Name: | us-gaap_InsuranceRecoveries
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity. + References No definition available. + Details
Name: | us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
Name: | us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
Name: | us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(14)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_PropertyPlantAndEquipmentNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
Name: | us-gaap_RestructuringCharges
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | btu_MineLocationAxis=btu_OtherUSMiningOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | btu_MineLocationAxis=btu_NorthGoonyellaMineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | btu_EquipmentLossTypeAxis=btu_MineCarryingValueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | btu_MineLocationAxis=btu_WildcatHillsUndergroundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_OwnershipAxis=btu_PRBColoradoJointVentureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |