Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-21-181289-index-headers.html | 2021-06-03 16:02:43 | |
| 0001193125-21-181289-index.html | 2021-06-03 16:02:43 | |
| 0001193125-21-181289.txt | 2021-06-03 16:02:43 | |
 0001193125-21-181289-xbrl.zip | 8380 | 2021-06-03 16:02:43 |
| btu-20210601.xsd | 3090 | 2021-06-03 16:02:43 |
| btu-20210601_lab.xml | 17373 | 2021-06-03 16:02:43 |
| btu-20210601_pre.xml | 10967 | 2021-06-03 16:02:43 |
| d183745d8k.htm | 24668 | 2021-06-03 16:02:43 |
| d183745d8k_htm.xml | 3276 | 2021-06-03 16:02:43 |
| FilingSummary.xml | 1697 | 2021-06-03 16:02:43 |
| Financial_Report.xlsx | 5678 | 2021-06-03 16:02:43 |
| MetaLinks.json | 18460 | 2021-06-03 16:02:43 |
| R1.htm | 38621 | 2021-06-03 16:02:43 |
| report.css | 2766 | 2021-06-03 16:02:43 |
| Show.js | 1084 | 2021-06-03 16:02:43 |