Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-21-361351-index-headers.html | 2021-12-17 17:18:03 | |
| 0001193125-21-361351-index.html | 2021-12-17 17:18:03 | |
| 0001193125-21-361351.txt | 2021-12-17 17:18:03 | |
 0001193125-21-361351-xbrl.zip | 11639 | 2021-12-17 17:18:03 |
| btu-20211217.xsd | 2904 | 2021-12-17 17:18:03 |
| btu-20211217_lab.xml | 17374 | 2021-12-17 17:18:03 |
| btu-20211217_pre.xml | 10962 | 2021-12-17 17:18:03 |
| d195697d8k.htm | 28627 | 2021-12-17 17:18:03 |
| d195697d8k_htm.xml | 3276 | 2021-12-17 17:18:03 |
| d195697dex51.htm | 8390 | 2021-12-17 17:18:03 |
| FilingSummary.xml | 1728 | 2021-12-17 17:18:03 |
| Financial_Report.xlsx | 5675 | 2021-12-17 17:18:03 |
 g195697dsp010a.jpg | 3034 | 2021-12-17 17:18:03 |
 g195697g00w84.jpg | 1977 | 2021-12-17 17:18:03 |
| MetaLinks.json | 18077 | 2021-12-17 17:18:03 |
| R1.htm | 38620 | 2021-12-17 17:18:03 |
| report.css | 2767 | 2021-12-17 17:18:03 |
| Show.js | 1085 | 2021-12-17 17:18:03 |