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| 0001193125-24-010305-index.html | 2024-01-18 17:27:30 | |
| 0001193125-24-010305.txt | 2024-01-18 17:27:30 | |
 0001193125-24-010305-xbrl.zip | 166109 | 2024-01-18 17:27:30 |
| btu-20240118.xsd | 2865 | 2024-01-18 17:27:30 |
| btu-20240118_lab.xml | 17235 | 2024-01-18 17:27:30 |
| btu-20240118_pre.xml | 10823 | 2024-01-18 17:27:30 |
| d143641d8k.htm | 26773 | 2024-01-18 17:27:30 |
| d143641d8k_htm.xml | 3270 | 2024-01-18 17:27:30 |
| d143641dex11.htm | 885857 | 2024-01-18 17:27:30 |
| FilingSummary.xml | 1716 | 2024-01-18 17:27:30 |
| Financial_Report.xlsx | 5698 | 2024-01-18 17:27:30 |
| MetaLinks.json | 18408 | 2024-01-18 17:27:30 |
| R1.htm | 38098 | 2024-01-18 17:27:30 |
| report.css | 2767 | 2024-01-18 17:27:30 |
| Show.js | 1084 | 2024-01-18 17:27:30 |