The bankruptcy filing of coal giant Peabody Energy Corp. Wednesday comes after a failed effort earlier this year to use its Australian unit to avoid chapter 11 and restructure out of court. Peabody described the previously confidential restructuring details in financial documents Wednesday, noting that its Australian operations, which saw increased earnings last year, would remain untouched by the chapter 11 case. Peabody’s Australian unit isn’t among the collateral backing $4.3 billion owed to its senior lenders. The company, which owes another $4.5 billion to unsecured bondholders, had hoped to avoid a sale of most of its U.S. mining assets by raising new debt that was secured by the Australian subsidiary and another unit unencumbered by Peabody guarantees. The now-abandoned restructuring deal was tied to a massive bond exchange, offered to the holders of five […]