XML 39 R2.htm IDEA: XBRL DOCUMENT
v3.23.1

Pay vs Performance Disclosure - USD ($) | 12 Months Ended | 18 Months Ended | 74 Months Ended
--- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2022 | Jun. 30, 2021
Pay vs Performance Disclosure [Table] |  |  |  |  |
Pay vs Performance [Table Text Block] |
|  |  |  |  |  |  | Value of Initial Fixed $100 Investment Based On:4 |  |
Year | Summary Compensation Table Total for Glenn L. Kellow 1 ($) | Compensation Actually Paid to Glenn L. Kellow 1,2,3 ($) | Summary Compensation Table Total for James C. Grech 1 ($) | Compensation Actually Paid to James C. Grech 1,2,3 ($) | Average Summary Compensation Table Total for Non-PEO NEOs 1 ($) | Average Compensation Actually Paid to Non-PEO NEOs 1,2,3 ($) | TSR ($) | Peer Group TSR ($) | Net Income ($) | Adjusted EBITDA 5 ($)
(a) | (b) | (c) | (b) | (c) | (d) | (e) | (f) | (g) | (h) | (i)
2022 | n/a | n/a | 3,811,296 | 8,016,084 | 2,172,769 | 4,353,640 | 289.69 | 211.70 | 1,319,100,000 | 1,844,700,000
2021 | 8,753,812 | 11,945,403 | 4,239,272 | 4,777,733 | 2,195,035 | 3,284,553 | 110.42 | 125.14 | 371,400,000 | 916,700,000
2020 | 6,352,911 | (795,179) | n/a | n/a | 1,751,662 | 719,821 | 26.43 | 80.70 | (1,873,800,000) | 258,800,000
Company Selected Measure Name | Adjusted EBITDA |  |  |  |
Named Executive Officers, Footnote [Text Block] | (1)Glenn L. Kellow was our PEO from May 2015 to June 2021. James C. Grech was our PEO from June 2021 to present. The individuals comprising the Non-PEO NEOs for each year presented are listed below.
2020 | 2021 | 2022
Mark A. Spurbeck | Mark A. Spurbeck | Mark A. Spurbeck
Darren R. Yeates | Darren R. Yeates | Darren R. Yeates
Marc E. Hathhorn | Marc E. Hathhorn | Marc E. Hathhorn
Kemal Williamson | Scott T. Jarboe | Scott T. Jarboe
Amy B. Schwetz | Kemal Williamson |
Charles F. Meintjes |  |
Peer Group Issuers, Footnote [Text Block] | (4) The Peer Group TSR set forth in this table utilizes a custom group of peer companies, which we also utilize in the stock performance graph required by Item 201(e) of Regulation S-K included in our Annual Report for the year ended December 31, 2022. The comparison assumes $100 was invested for the period starting December 31, 2019, through the end of the listed year in the Company and in the custom group of peer companies used in our performance graph, respectively. Historical stock performance is not necessarily indicative of future stock performance. The Custom Composite Index (a peer group comprised of Arch Resources, Inc., Hallador Energy Co., and Warrior Met Coal, Inc.) reflects publicly listed U.S. companies within the coal industry of similar size or product type. |  |  |  |
Adjustment To PEO Compensation, Footnote [Text Block] | Compensation Actually Paid reflects the exclusions and inclusions of certain amounts for the PEOs and the Non-PEO NEOs as set forth below. Equity values are calculated in accordance with FASB ASC Topic 718. Amounts in the Exclusion of Stock Awards column are the totals from the Stock Awards column set forth in the Summary Compensation Table.
Year | Summary Compensation Table Total for Glenn L. Kellow ($) | Exclusion of Stock Awards for Glenn L. Kellow ($) | Inclusion of Equity Values for Glenn L. Kellow ($) | Compensation Actually Paid to Glenn L. Kellow ($)
2021 | 8,753,812 | (1,193,696) | 4,385,287 | 11,945,403
2020 | 6,352,911 | (5,209,680) | (1,938,410) | (795,179)
Year | Summary Compensation Table Total for James C. Grech ($) | Exclusion of Stock Awards for James C. Grech ($) | Inclusion of Equity Values for James C. Grech ($) | Compensation Actually Paid to James C. Grech ($)
2022 | 3,811,296 | (734,991) | 4,939,779 | 8,016,084
2021 | 4,239,272 | (1,499,999) | 2,038,460 | 4,777,733
Year | Average Summary Compensation Table Total for Non-PEO NEOs ($) | Average Exclusion of Stock Awards for Non-PEO NEOs ($) | Average Inclusion of Equity Values for Non-PEO NEOs ($) | Average Compensation Actually Paid to Non-PEO NEOs ($)
2022 | 2,172,769 | (270,632) | 2,451,503 | 4,353,640
2021 | 2,195,035 | (161,265) | 1,250,783 | 3,284,553
2020 | 1,751,662 | (712,037) | (319,805) | 719,821
The amounts in the Inclusion of Equity Values in the tables above are derived from the amounts set forth in the following tables:
Year | Year-End Fair Value of Equity Awards Granted During Year That Remained Unvested as of Last Day of Year for Glenn L. Kellow ($) | Change in Fair Value from Last Day of Prior Year to Last Day of Year of Unvested Equity Awards for Glenn L. Kellow ($) | Vesting-Date Fair Value of Equity Awards Granted During Year that Vested During Year for Glenn L. Kellow ($) | Change in Fair Value from Last Day of Prior Year to Vesting Date of Unvested Equity Awards that Vested During Year for Glenn L. Kellow ($) | Fair Value at Last Day of Prior Year of Equity Awards Forfeited During Year for Glenn L. Kellow ($) | Total - Inclusion of Equity Values for Glenn L. Kellow ($)
2021 | 0 | 3,185,955 | 926,250 | 451,761 | (178,679) | 4,385,287
2020 | 581,568 | (652,654) | 0 | (1,867,324) | 0 | (1,938,410)
Year | Year-End Fair Value of Equity Awards Granted During Year That Remained Unvested as of Last Day of Year for James C. Grech ($) | Change in Fair Value from Last Day of Prior Year to Last Day of Year of Unvested Equity Awards for James C. Grech ($) | Vesting-Date Fair Value of Equity Awards Granted During Year that Vested During Year for James C. Grech ($) | Change in Fair Value from Last Day of Prior Year to Vesting Date of Unvested Equity Awards that Vested During Year for James C. Grech ($) | Fair Value at Last Day of Prior Year of Equity Awards Forfeited During Year for James C. Grech ($) | Total - Inclusion of Equity Values for James C. Grech ($)
2022 | 1,712,386 | 2,206,482 | 0 | 1,020,912 | 0 | 4,939,779
2021 | 2,038,460 | 0 | 0 | 0 | 0 | 2,038,460
Year | Average Year-End Fair Value of Equity Awards Granted During Year That Remained Unvested as of Last Day of Year for Non-PEO NEOs ($) | Average Change in Fair Value from Last Day of Prior Year to Last Day of Year of Unvested Equity Awards for Non-PEO NEOs ($) | Average Vesting-Date Fair Value of Equity Awards Granted During Year that Vested During Year for Non-PEO NEOs ($) | Average Change in Fair Value from Last Day of Prior Year to Vesting Date of Unvested Equity Awards that Vested During Year for Non-PEO NEOs ($) | Average Fair Value at Last Day of Prior Year of Equity Awards Forfeited During Year for Non-PEO NEOs ($) | Average Total - Inclusion of Equity Values for Non-PEO NEOs ($)
2022 | 630,520 | 1,788,871 | 0 | 32,112 | 0 | 2,451,503
2021 | 552,360 | 682,434 | 0 | 15,989 | 0 | 1,250,783
2020 | 97,128 | (122,208) | 4,184 | (298,909) | 0 | (319,805)
Non-PEO NEO Average Total Compensation Amount | $ 2,172,769 | $ 2,195,035 | $ 1,751,662 |  |
Non-PEO NEO Average Compensation Actually Paid Amount | $ 4,353,640 | 3,284,553 | 719,821 |  |
Adjustment to Non-PEO NEO Compensation Footnote [Text Block] | Compensation Actually Paid reflects the exclusions and inclusions of certain amounts for the PEOs and the Non-PEO NEOs as set forth below. Equity values are calculated in accordance with FASB ASC Topic 718. Amounts in the Exclusion of Stock Awards column are the totals from the Stock Awards column set forth in the Summary Compensation Table.
Year | Summary Compensation Table Total for Glenn L. Kellow ($) | Exclusion of Stock Awards for Glenn L. Kellow ($) | Inclusion of Equity Values for Glenn L. Kellow ($) | Compensation Actually Paid to Glenn L. Kellow ($)
2021 | 8,753,812 | (1,193,696) | 4,385,287 | 11,945,403
2020 | 6,352,911 | (5,209,680) | (1,938,410) | (795,179)
Year | Summary Compensation Table Total for James C. Grech ($) | Exclusion of Stock Awards for James C. Grech ($) | Inclusion of Equity Values for James C. Grech ($) | Compensation Actually Paid to James C. Grech ($)
2022 | 3,811,296 | (734,991) | 4,939,779 | 8,016,084
2021 | 4,239,272 | (1,499,999) | 2,038,460 | 4,777,733
Year | Average Summary Compensation Table Total for Non-PEO NEOs ($) | Average Exclusion of Stock Awards for Non-PEO NEOs ($) | Average Inclusion of Equity Values for Non-PEO NEOs ($) | Average Compensation Actually Paid to Non-PEO NEOs ($)
2022 | 2,172,769 | (270,632) | 2,451,503 | 4,353,640
2021 | 2,195,035 | (161,265) | 1,250,783 | 3,284,553
2020 | 1,751,662 | (712,037) | (319,805) | 719,821
The amounts in the Inclusion of Equity Values in the tables above are derived from the amounts set forth in the following tables:
Year | Year-End Fair Value of Equity Awards Granted During Year That Remained Unvested as of Last Day of Year for Glenn L. Kellow ($) | Change in Fair Value from Last Day of Prior Year to Last Day of Year of Unvested Equity Awards for Glenn L. Kellow ($) | Vesting-Date Fair Value of Equity Awards Granted During Year that Vested During Year for Glenn L. Kellow ($) | Change in Fair Value from Last Day of Prior Year to Vesting Date of Unvested Equity Awards that Vested During Year for Glenn L. Kellow ($) | Fair Value at Last Day of Prior Year of Equity Awards Forfeited During Year for Glenn L. Kellow ($) | Total - Inclusion of Equity Values for Glenn L. Kellow ($)
2021 | 0 | 3,185,955 | 926,250 | 451,761 | (178,679) | 4,385,287
2020 | 581,568 | (652,654) | 0 | (1,867,324) | 0 | (1,938,410)
Year | Year-End Fair Value of Equity Awards Granted During Year That Remained Unvested as of Last Day of Year for James C. Grech ($) | Change in Fair Value from Last Day of Prior Year to Last Day of Year of Unvested Equity Awards for James C. Grech ($) | Vesting-Date Fair Value of Equity Awards Granted During Year that Vested During Year for James C. Grech ($) | Change in Fair Value from Last Day of Prior Year to Vesting Date of Unvested Equity Awards that Vested During Year for James C. Grech ($) | Fair Value at Last Day of Prior Year of Equity Awards Forfeited During Year for James C. Grech ($) | Total - Inclusion of Equity Values for James C. Grech ($)
2022 | 1,712,386 | 2,206,482 | 0 | 1,020,912 | 0 | 4,939,779
2021 | 2,038,460 | 0 | 0 | 0 | 0 | 2,038,460
Year | Average Year-End Fair Value of Equity Awards Granted During Year That Remained Unvested as of Last Day of Year for Non-PEO NEOs ($) | Average Change in Fair Value from Last Day of Prior Year to Last Day of Year of Unvested Equity Awards for Non-PEO NEOs ($) | Average Vesting-Date Fair Value of Equity Awards Granted During Year that Vested During Year for Non-PEO NEOs ($) | Average Change in Fair Value from Last Day of Prior Year to Vesting Date of Unvested Equity Awards that Vested During Year for Non-PEO NEOs ($) | Average Fair Value at Last Day of Prior Year of Equity Awards Forfeited During Year for Non-PEO NEOs ($) | Average Total - Inclusion of Equity Values for Non-PEO NEOs ($)
2022 | 630,520 | 1,788,871 | 0 | 32,112 | 0 | 2,451,503
2021 | 552,360 | 682,434 | 0 | 15,989 | 0 | 1,250,783
2020 | 97,128 | (122,208) | 4,184 | (298,909) | 0 | (319,805)
Compensation Actually Paid vs. Total Shareholder Return [Text Block] | Description of Relationship Between PEO and Other NEO Compensation Actually Paid and Company Total Shareholder Return (“TSR”) The following chart sets forth the relationship between Compensation Actually Paid to our PEOs, the average of Compensation Actually Paid to our other NEOs, and the Company’s cumulative TSR over the three most recently completed fiscal years. |  |  |  |
Compensation Actually Paid vs. Net Income [Text Block] | Description of Relationship Between PEO and Other NEO Compensation Actually Paid and Net Income The following chart sets forth the relationship between Compensation Actually Paid to our PEOs, the average of Compensation Actually Paid to our other NEOs, and our net income during the three most recently completed fiscal years. |  |  |  |
Compensation Actually Paid vs. Company Selected Measure [Text Block] | Description of Relationship Between PEO and Other NEO Compensation Actually Paid and Adjusted EBITDA The following chart sets forth the relationship between Compensation Actually Paid to our PEOs, the average of Compensation Actually Paid to our other NEOs, and our Adjusted EBITDA during the three most recently completed fiscal years. This non-GAAP measure is defined and reconciled to the nearest GAAP measure in Appendix B. |  |  |  |
Total Shareholder Return Vs Peer Group [Text Block] | Description of Relationship Between Company TSR and Peer Group TSR The following chart compares our cumulative TSR over the three most recently completed fiscal years to that of the peer group, a Custom Composite Index comprised of Arch Resources, Inc., Hallador Energy Co., and Warrior Met Coal, Inc., over the same period. |  |  |  |
Tabular List [Table Text Block] |
Free Cash Flow
Environmental Reclamation
Adjusted EBITDA
TRIFR
Safety & Sustainability MS
Total Shareholder Return Amount | $ 289.69 | 110.42 | 26.43 |  |
Peer Group Total Shareholder Return Amount | 211.70 | 125.14 | 80.70 |  |
Net Income (Loss) | $ 1,319,100,000 | $ 371,400,000 | $ (1,873,800,000) |  |
Company Selected Measure Amount | 1,844,700,000 | 916,700,000 | 258,800,000 |  |
PEO Name |  |  |  | James C. Grech | Glenn L. Kellow
Additional 402(v) Disclosure [Text Block] | (2)The amounts shown for Compensation Actually Paid have been calculated in accordance with Item 402(v) of Regulation S-K and do not reflect compensation actually earned, realized, or received by the Company’s NEOs. These amounts reflect the Summary Compensation Table Total with certain adjustments as described in footnote 3 below. |  |  |  |
Measure [Axis]: 1 |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |
Measure Name | Free Cash Flow |  |  |  |
Measure [Axis]: 2 |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |
Measure Name | Environmental Reclamation |  |  |  |
Measure [Axis]: 3 |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |
Measure Name | Adjusted EBITDA |  |  |  |
Non-GAAP Measure Description [Text Block] | (5)We determined Adjusted EBITDA to be the most important financial performance measure used to link Company performance to Compensation Actually Paid to our PEOs and Non-PEO NEOs in 2022. We may determine a different financial performance measure to be the most important financial performance measure in future years. Adjusted EBITDA is a non-GAAP measure and is defined and reconciled to the nearest GAAP measure in Appendix B to this proxy statement. |  |  |  |
Measure [Axis]: 4 |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |
Measure Name | TRIFR |  |  |  |
Measure [Axis]: 5 |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |
Measure Name | Safety & Sustainability MS |  |  |  |
Grech [Member] |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |
PEO Total Compensation Amount | $ 3,811,296 | $ 4,239,272 |  |  |
PEO Actually Paid Compensation Amount | 8,016,084 | 4,777,733 |  |  |
Kellow [Member] |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |
PEO Total Compensation Amount |  | 8,753,812 | $ 6,352,911 |  |
PEO Actually Paid Compensation Amount |  | 11,945,403 | (795,179) |  |
PEO [Member] | Grech [Member] | Equity Awards Reported Value [Member] |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |
Adjustment to Compensation Amount | (734,991) | (1,499,999) |  |  |
PEO [Member] | Grech [Member] | Equity Award Adjustments [Member] |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |
Adjustment to Compensation Amount | 4,939,779 | 2,038,460 |  |  |
PEO [Member] | Grech [Member] | Equity Awards Granted During the Year, Unvested [Member] |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |
Adjustment to Compensation Amount, Equity Awards | 1,712,386 | 2,038,460 |  |  |
PEO [Member] | Grech [Member] | Equity Awards Granted in Prior Years, Unvested [Member] |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |
Adjustment to Compensation Amount, Equity Awards | 2,206,482 | 0 |  |  |
PEO [Member] | Grech [Member] | Equity Awards Granted During the Year, Vested [Member] |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |
Adjustment to Compensation Amount, Equity Awards | 0 | 0 |  |  |
PEO [Member] | Grech [Member] | Equity Awards Granted in Prior Years, Vested [Member] |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |
Adjustment to Compensation Amount, Equity Awards | 1,020,912 | 0 |  |  |
PEO [Member] | Grech [Member] | Equity Awards Granted in Prior Years, Forfeited [Member] |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |
Adjustment to Compensation Amount, Equity Awards | 0 | 0 |  |  |
PEO [Member] | Kellow [Member] | Equity Awards Reported Value [Member] |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |
Adjustment to Compensation Amount |  | (1,193,696) | (5,209,680) |  |
PEO [Member] | Kellow [Member] | Equity Award Adjustments [Member] |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |
Adjustment to Compensation Amount |  | 4,385,287 | (1,938,410) |  |
PEO [Member] | Kellow [Member] | Equity Awards Granted During the Year, Unvested [Member] |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |
Adjustment to Compensation Amount, Equity Awards |  | 0 | 581,568 |  |
PEO [Member] | Kellow [Member] | Equity Awards Granted in Prior Years, Unvested [Member] |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |
Adjustment to Compensation Amount, Equity Awards |  | 3,185,955 | (652,654) |  |
PEO [Member] | Kellow [Member] | Equity Awards Granted During the Year, Vested [Member] |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |
Adjustment to Compensation Amount, Equity Awards |  | 926,250 | 0 |  |
PEO [Member] | Kellow [Member] | Equity Awards Granted in Prior Years, Vested [Member] |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |
Adjustment to Compensation Amount, Equity Awards |  | 451,761 | (1,867,324) |  |
PEO [Member] | Kellow [Member] | Equity Awards Granted in Prior Years, Forfeited [Member] |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |
Adjustment to Compensation Amount, Equity Awards |  | (178,679) | 0 |  |
Non-PEO NEO [Member] | Equity Awards Reported Value [Member] |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |
Adjustment to Compensation Amount | (270,632) | (161,265) | (712,037) |  |
Non-PEO NEO [Member] | Equity Award Adjustments [Member] |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |
Adjustment to Compensation Amount | 2,451,503 | 1,250,783 | (319,805) |  |
Non-PEO NEO [Member] | Equity Awards Granted During the Year, Unvested [Member] |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |
Adjustment to Compensation Amount, Equity Awards | 630,520 | 552,360 | 97,128 |  |
Non-PEO NEO [Member] | Equity Awards Granted in Prior Years, Unvested [Member] |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |
Adjustment to Compensation Amount, Equity Awards | 1,788,871 | 682,434 | (122,208) |  |
Non-PEO NEO [Member] | Equity Awards Granted During the Year, Vested [Member] |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |
Adjustment to Compensation Amount, Equity Awards | 0 | 0 | 4,184 |  |
Non-PEO NEO [Member] | Equity Awards Granted in Prior Years, Vested [Member] |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |
Adjustment to Compensation Amount, Equity Awards | 32,112 | 15,989 | (298,909) |  |
Non-PEO NEO [Member] | Equity Awards Granted in Prior Years, Forfeited [Member] |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |
Adjustment to Compensation Amount, Equity Awards | $ 0 | $ 0 | $ 0 |  |

X
- References No definition available. + Details
Name: | btu_AdjustmentToCompensationAmountEquityAwards
Namespace Prefix: | btu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v + Details
Name: | ecd_Additional402vDisclosureTextBlock
Namespace Prefix: | ecd_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 3 + Details
Name: | ecd_AdjToCompAmt
Namespace Prefix: | ecd_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 3 + Details
Name: | ecd_AdjToNonPeoNeoCompFnTextBlock
Namespace Prefix: | ecd_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 3 + Details
Name: | ecd_AdjToPeoCompFnTextBlock
Namespace Prefix: | ecd_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 2 -Subparagraph vi + Details
Name: | ecd_CoSelectedMeasureAmt
Namespace Prefix: | ecd_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 2 -Subparagraph vi + Details
Name: | ecd_CoSelectedMeasureName
Namespace Prefix: | ecd_
Data Type: | xbrli:normalizedStringItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 5 -Subparagraph iii + Details
Name: | ecd_CompActuallyPaidVsCoSelectedMeasureTextBlock
Namespace Prefix: | ecd_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 5 -Subparagraph ii + Details
Name: | ecd_CompActuallyPaidVsNetIncomeTextBlock
Namespace Prefix: | ecd_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 5 -Subparagraph i + Details
Name: | ecd_CompActuallyPaidVsTotalShareholderRtnTextBlock
Namespace Prefix: | ecd_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 2 -Subparagraph vi + Details
Name: | ecd_MeasureName
Namespace Prefix: | ecd_
Data Type: | xbrli:normalizedStringItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 3 + Details
Name: | ecd_NamedExecutiveOfficersFnTextBlock
Namespace Prefix: | ecd_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 2 -Subparagraph vi + Details
Name: | ecd_NonGaapMeasureDescriptionTextBlock
Namespace Prefix: | ecd_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 2 -Subparagraph iii + Details
Name: | ecd_NonPeoNeoAvgCompActuallyPaidAmt
Namespace Prefix: | ecd_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 2 -Subparagraph ii + Details
Name: | ecd_NonPeoNeoAvgTotalCompAmt
Namespace Prefix: | ecd_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 2 -Subparagraph iv + Details
Name: | ecd_PeerGroupIssuersFnTextBlock
Namespace Prefix: | ecd_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 2 -Subparagraph iv + Details
Name: | ecd_PeerGroupTotalShareholderRtnAmt
Namespace Prefix: | ecd_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 2 -Subparagraph iii + Details
Name: | ecd_PeoActuallyPaidCompAmt
Namespace Prefix: | ecd_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 3 + Details
Name: | ecd_PeoName
Namespace Prefix: | ecd_
Data Type: | xbrli:normalizedStringItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 2 -Subparagraph ii + Details
Name: | ecd_PeoTotalCompAmt
Namespace Prefix: | ecd_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 1 + Details
Name: | ecd_PvpTable
Namespace Prefix: | ecd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 1 + Details
Name: | ecd_PvpTableTextBlock
Namespace Prefix: | ecd_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 6 + Details
Name: | ecd_TabularListTableTextBlock
Namespace Prefix: | ecd_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 2 -Subparagraph iv + Details
Name: | ecd_TotalShareholderRtnAmt
Namespace Prefix: | ecd_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K -Number 229 -Section 402 -Subsection v -Paragraph 5 -Subparagraph iv + Details
Name: | ecd_TotalShareholderRtnVsPeerGroupTextBlock
Namespace Prefix: | ecd_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22595-107794 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(18)) -URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 40 -Section 65 -Paragraph 1 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=126732423&loc=SL123482106-238011 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=124431353&loc=SL124452729-227067 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(5)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756 Reference 8: 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(20)) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22499-107794 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(iv)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(iii)(A)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(i)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(i)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756 Reference 15: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 9 -URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22663-107794 Reference 16: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(iv)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756 Reference 17: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(ii)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756 Reference 18: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612 Reference 19: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22583-107794 Reference 20: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)(1)(ii)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 21: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126958026&loc=SL5780133-109256 Reference 22: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 Reference 23: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22658-107794 Reference 24: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669619-108580 Reference 25: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8924-108599 Reference 26: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 11 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22694-107794 Reference 27: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 11 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124431687&loc=d3e22694-107794 Reference 28: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=109222650&loc=SL51721683-107760 Reference 29: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669625-108580 Reference 30: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 31: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(5)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756 Reference 32: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(iii)(B)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756 Reference 33: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(iii)(A)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756 Reference 34: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8906-108599 Reference 35: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 + Details
Name: | us-gaap_NetIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | ecd_MeasureAxis=1
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_MeasureAxis=2
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_MeasureAxis=3
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_MeasureAxis=4
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_MeasureAxis=5
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_IndividualAxis=btu_GrechMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_IndividualAxis=btu_KellowMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_ExecutiveCategoryAxis=ecd_PeoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_AdjToCompAxis=btu_EquityAwardsReportedValueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_AdjToCompAxis=btu_EquityAwardAdjustmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_AdjToCompAxis=btu_EquityAwardsGrantedDuringTheYearUnvestedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_AdjToCompAxis=btu_EquityAwardsGrantedInPriorYearsUnvestedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_AdjToCompAxis=btu_EquityAwardsGrantedDuringTheYearVestedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_AdjToCompAxis=btu_EquityAwardsGrantedInPriorYearsVestedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_AdjToCompAxis=btu_EquityAwardsGrantedInPriorYearsForfeitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ecd_ExecutiveCategoryAxis=ecd_NonPeoNeoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |