Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-21-022218-index-headers.html | 2021-01-29 12:56:01 | |
| 0001193125-21-022218-index.html | 2021-01-29 12:56:01 | |
| 0001193125-21-022218.txt | 2021-01-29 12:56:01 | |
 0001193125-21-022218-xbrl.zip | 15569 | 2021-01-29 12:56:01 |
| btu-20210129.xsd | 3081 | 2021-01-29 12:56:01 |
| btu-20210129_lab.xml | 17373 | 2021-01-29 12:56:01 |
| btu-20210129_pre.xml | 10961 | 2021-01-29 12:56:01 |
| d90735d8k.htm | 28761 | 2021-01-29 12:56:01 |
| d90735d8k_htm.xml | 3276 | 2021-01-29 12:56:01 |
| d90735dex101.htm | 51480 | 2021-01-29 12:56:01 |
| FilingSummary.xml | 1725 | 2021-01-29 12:56:01 |
| Financial_Report.xlsx | 5456 | 2021-01-29 12:56:01 |
| MetaLinks.json | 18384 | 2021-01-29 12:56:01 |
| R1.htm | 38620 | 2021-01-29 12:56:01 |
| report.css | 2767 | 2021-01-29 12:56:01 |
| Show.js | 1084 | 2021-01-29 12:56:01 |