Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-21-276143-index-headers.html | 2021-09-17 16:11:59 | |
| 0001193125-21-276143-index.html | 2021-09-17 16:11:59 | |
| 0001193125-21-276143.txt | 2021-09-17 16:11:59 | |
 0001193125-21-276143-xbrl.zip | 11054 | 2021-09-17 16:11:59 |
| btu-20210917.xsd | 2903 | 2021-09-17 16:11:59 |
| btu-20210917_lab.xml | 17373 | 2021-09-17 16:11:59 |
| btu-20210917_pre.xml | 10961 | 2021-09-17 16:11:59 |
| d233952d8k.htm | 28503 | 2021-09-17 16:11:59 |
| d233952d8k_htm.xml | 3276 | 2021-09-17 16:11:59 |
| d233952dex51.htm | 6813 | 2021-09-17 16:11:59 |
| FilingSummary.xml | 1728 | 2021-09-17 16:11:59 |
| Financial_Report.xlsx | 5676 | 2021-09-17 16:11:59 |
 g233952g0916234213686.jpg | 1874 | 2021-09-17 16:11:59 |
| MetaLinks.json | 18331 | 2021-09-17 16:11:59 |
| R1.htm | 38620 | 2021-09-17 16:11:59 |
| report.css | 2767 | 2021-09-17 16:11:59 |
| Show.js | 1085 | 2021-09-17 16:11:59 |