Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-21-085942-index-headers.html | 2021-03-18 17:05:05 | |
| 0001193125-21-085942-index.html | 2021-03-18 17:05:05 | |
| 0001193125-21-085942.txt | 2021-03-18 17:05:05 | |
 0001193125-21-085942-xbrl.zip | 22038 | 2021-03-18 17:05:05 |
| btu-20210318.xsd | 3082 | 2021-03-18 17:05:05 |
| btu-20210318_lab.xml | 17374 | 2021-03-18 17:05:05 |
| btu-20210318_pre.xml | 10962 | 2021-03-18 17:05:05 |
| d102096d8k.htm | 29423 | 2021-03-18 17:05:05 |
| d102096d8k_htm.xml | 3276 | 2021-03-18 17:05:05 |
| d102096dex101.htm | 49825 | 2021-03-18 17:05:05 |
| d102096dex991.htm | 4455 | 2021-03-18 17:05:05 |
| FilingSummary.xml | 1764 | 2021-03-18 17:05:05 |
| Financial_Report.xlsx | 5456 | 2021-03-18 17:05:05 |
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| MetaLinks.json | 18388 | 2021-03-18 17:05:05 |
| R1.htm | 38620 | 2021-03-18 17:05:05 |
| report.css | 2767 | 2021-03-18 17:05:05 |
| Show.js | 1085 | 2021-03-18 17:05:05 |