Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-21-177169-index-headers.html | 2021-05-28 17:02:31 | |
| 0001193125-21-177169-index.html | 2021-05-28 17:02:31 | |
| 0001193125-21-177169.txt | 2021-05-28 17:02:31 | |
 0001193125-21-177169-xbrl.zip | 8031 | 2021-05-28 17:02:31 |
| btu-20210521.xsd | 3091 | 2021-05-28 17:02:31 |
| btu-20210521_lab.xml | 18087 | 2021-05-28 17:02:31 |
| btu-20210521_pre.xml | 11408 | 2021-05-28 17:02:31 |
| d130541d8ka.htm | 23106 | 2021-05-28 17:02:31 |
| d130541d8ka_htm.xml | 4564 | 2021-05-28 17:02:31 |
| FilingSummary.xml | 1702 | 2021-05-28 17:02:31 |
| Financial_Report.xlsx | 6185 | 2021-05-28 17:02:31 |
| MetaLinks.json | 19034 | 2021-05-28 17:02:31 |
| R1.htm | 41301 | 2021-05-28 17:02:31 |
| report.css | 2766 | 2021-05-28 17:02:31 |
| Show.js | 1084 | 2021-05-28 17:02:31 |