Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-21-071620-index-headers.html | 2021-03-05 17:02:11 | |
| 0001193125-21-071620-index.html | 2021-03-05 17:02:11 | |
| 0001193125-21-071620.txt | 2021-03-05 17:02:11 | |
 0001193125-21-071620-xbrl.zip | 27099 | 2021-03-05 17:02:11 |
| btu-20210301.xsd | 3080 | 2021-03-05 17:02:11 |
| btu-20210301_lab.xml | 17372 | 2021-03-05 17:02:11 |
| btu-20210301_pre.xml | 10960 | 2021-03-05 17:02:11 |
| d151624d8k.htm | 28967 | 2021-03-05 17:02:11 |
| d151624d8k_htm.xml | 3276 | 2021-03-05 17:02:11 |
| d151624dex101.htm | 65701 | 2021-03-05 17:02:11 |
| d151624dex102.htm | 10905 | 2021-03-05 17:02:11 |
| FilingSummary.xml | 1764 | 2021-03-05 17:02:11 |
| Financial_Report.xlsx | 5457 | 2021-03-05 17:02:11 |
| MetaLinks.json | 18388 | 2021-03-05 17:02:11 |
| R1.htm | 38621 | 2021-03-05 17:02:11 |
| report.css | 2767 | 2021-03-05 17:02:11 |
| Show.js | 1085 | 2021-03-05 17:02:11 |