XML 133 R114.htm IDEA: XBRL DOCUMENT
v3.20.4

Share-Based Compensation - Textual (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) vesting_anniversary shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 shares
Share-Based Compensation Expense and Cash Flows (Line Items) |  |  |  |
Unrecognized compensation cost related to nonvested awards net of tax Total | $ | $ 13.5 |  |  |
Share-based payment arrangement, nonvested award, cost not yet recognized, period for recognition | 2 years |  |  |
Unrecognized compensation cost period for recognition, weighted-average, years | 8 months 12 days |  |  |
2017 Incentive Plan |  |  |  |
Share-Based Compensation Expense and Cash Flows (Line Items) |  |  |  |
Common stock reserved for future issuance |  |  |  | 14,000,000
Common Stock |  |  |  |
Share-Based Compensation Expense and Cash Flows (Line Items) |  |  |  |
Number of shares authorized (in shares) | 7,300,000 |  |  |
Deferred Stock Units |  |  |  |
Share-Based Compensation Expense and Cash Flows (Line Items) |  |  |  |
Award vesting period |  | 12 months |  |
Award settlement period after grant date |  | 3 years |  |
Restricted Stock Units (RSUs) |  |  |  |
Share-Based Compensation Expense and Cash Flows (Line Items) |  |  |  |
Award vesting period | 3 years |  |  |
Total fair value of restricted stock units granted | $ | $ 16.6 | $ 19.8 | $ 18.2 |
Nonvested shares outstanding (in shares) | 1,629,956 | 1,706,025 |  |
Total fair value of restricted stock units vested | $ | $ 5.6 | $ 40.3 | $ 46.2 |
Emergence Awards |  |  |  |
Share-Based Compensation Expense and Cash Flows (Line Items) |  |  |  |
Number of award vesting times | vesting_anniversary | 3 |  |  |
Nonvested shares outstanding (in shares) | 0 |  |  |
Dividend Equivalent Units |  |  |  |
Share-Based Compensation Expense and Cash Flows (Line Items) |  |  |  |
Nonvested shares outstanding (in shares) | 32,000 |  |  |
Performance Units |  |  |  |
Share-Based Compensation Expense and Cash Flows (Line Items) |  |  |  |
Award vesting period | 3 years |  |  |
Return on invested capital period | 3 years |  |  |
Stock price measurement period | 3 years |  |  |
Payout term, percentage of change | 25.00% |  |  |
Nonvested shares outstanding (in shares) | 858,588 | 426,606 |  |
Vested performance units | 0 |  |  |
Dividend Equivalent Units, Performance Shares |  |  |  |
Share-Based Compensation Expense and Cash Flows (Line Items) |  |  |  |
Nonvested shares outstanding (in shares) | 33,000 |  |  |

X
- Definition Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition, Weighted-Average + References No definition available. + Details
Name: | btu_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognitionWeightedAverage
Namespace Prefix: | btu_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share-Based Compensation Arrangement By Share-Based Payment Award, Award Settlement Period After Grant Date + References No definition available. + Details
Name: | btu_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardSettlementPeriodAfterGrantDate
Namespace Prefix: | btu_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share-Based Compensation Arrangement By Share-Based Payment Award, Award Vesting Times + References No definition available. + Details
Name: | btu_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingTimes
Namespace Prefix: | btu_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Share based compensation arrangement by share based payment award equity instruments other than options granted in period fair value. + References No definition available. + Details
Name: | btu_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodFairValue
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Fair Value. + References No definition available. + Details
Name: | btu_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodFairValue
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Share-based Compensation Arrangement by Share-based Payment Award, Measurement Term, Return On Invested Capital Period + References No definition available. + Details
Name: | btu_ShareBasedCompensationArrangementByShareBasedPaymentAwardMeasurementTermReturnOnInvestedCapitalPeriod
Namespace Prefix: | btu_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share-based Compensation Arrangement by Share-based Payment Award, Payout Term, Percentage Of Change + References No definition available. + Details
Name: | btu_ShareBasedCompensationArrangementByShareBasedPaymentAwardPayoutTermPercentageOfChange
Namespace Prefix: | btu_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share-based Compensation Arrangement by Share-based Payment Award, Stock Price Measurement Period + References No definition available. + Details
Name: | btu_ShareBasedCompensationArrangementByShareBasedPaymentAwardStockPriceMeasurementPeriod
Namespace Prefix: | btu_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate number of common shares reserved for future issuance. + 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 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares authorized for issuance under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_PlanNameAxis=btu_A2017IncentivePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=btu_DeferredStockUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=btu_EmergenceAwardsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=btu_DividendEquivalentUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_PerformanceSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=btu_DividendEquivalentUnitsPerformanceSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |