Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-21-023701-index-headers.html | 2021-02-01 07:31:57 | |
| 0001193125-21-023701-index.html | 2021-02-01 07:31:57 | |
| 0001193125-21-023701.txt | 2021-02-01 07:31:57 | |
 0001193125-21-023701-xbrl.zip | 300286 | 2021-02-01 07:31:57 |
| btu-20210129.xsd | 2735 | 2021-02-01 07:31:57 |
| btu-20210129_lab.xml | 18076 | 2021-02-01 07:31:57 |
| btu-20210129_pre.xml | 11373 | 2021-02-01 07:31:57 |
| d115217d8ka.htm | 29449 | 2021-02-01 07:31:57 |
| d115217d8ka_htm.xml | 3777 | 2021-02-01 07:31:57 |
| d115217dex101.htm | 2081798 | 2021-02-01 07:31:57 |
| FilingSummary.xml | 1734 | 2021-02-01 07:31:57 |
| Financial_Report.xlsx | 5673 | 2021-02-01 07:31:57 |
| MetaLinks.json | 18828 | 2021-02-01 07:31:57 |
| R1.htm | 40550 | 2021-02-01 07:31:57 |
| report.css | 2767 | 2021-02-01 07:31:57 |
| Show.js | 1084 | 2021-02-01 07:31:57 |