Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-21-023705-index-headers.html | 2021-02-01 07:33:35 | |
| 0001193125-21-023705-index.html | 2021-02-01 07:33:35 | |
| 0001193125-21-023705.txt | 2021-02-01 07:33:35 | |
 0001193125-21-023705-xbrl.zip | 625357 | 2021-02-01 07:33:35 |
| btu-20210126.xsd | 2737 | 2021-02-01 07:33:35 |
| btu-20210126_lab.xml | 18078 | 2021-02-01 07:33:35 |
| btu-20210126_pre.xml | 11375 | 2021-02-01 07:33:35 |
| d121438d8ka.htm | 61803 | 2021-02-01 07:33:35 |
| d121438d8ka_htm.xml | 3843 | 2021-02-01 07:33:35 |
| d121438dex101.htm | 749074 | 2021-02-01 07:33:35 |
| d121438dex102.htm | 969472 | 2021-02-01 07:33:35 |
| d121438dex103.htm | 137396 | 2021-02-01 07:33:35 |
| d121438dex41.htm | 900583 | 2021-02-01 07:33:35 |
| d121438dex42.htm | 910978 | 2021-02-01 07:33:35 |
| d121438dex43.htm | 30538 | 2021-02-01 07:33:35 |
| d121438dex44.htm | 36500 | 2021-02-01 07:33:35 |
| d121438dex991.htm | 11650 | 2021-02-01 07:33:35 |
| d121438dex992.htm | 12931 | 2021-02-01 07:33:35 |
| FilingSummary.xml | 2010 | 2021-02-01 07:33:35 |
| Financial_Report.xlsx | 5642 | 2021-02-01 07:33:35 |
 g121438logo_01.jpg | 3906 | 2021-02-01 07:33:35 |
| MetaLinks.json | 18828 | 2021-02-01 07:33:35 |
| R1.htm | 40541 | 2021-02-01 07:33:35 |
| report.css | 2767 | 2021-02-01 07:33:35 |
| Show.js | 1085 | 2021-02-01 07:33:35 |