Other Events	12 Months Ended
Other Events	Dec. 31, 2025
Other Events [Abstract]
Other Events	Other Events Wards Well Acquisition On April 16, 2024 the Company acquired the southern part of the Wards Well tenements (Wards Well) which are adjacent to the Company’s Centurion Mine in Queensland, Australia. The acquisition was accounted for as an asset acquisition. The acquired asset was measured at the cost of the acquisition based on the total consideration, allocated on the basis of relative fair value. The total consideration of $153.4 million, consisting of cash consideration of $134.4 million, cash transaction costs of $9.4 million and the non-cash settlement of existing receivables with the acquiree of $9.6 million, was recorded in “Property, plant, equipment and mine development, net” in the consolidated balance sheets. The agreement also included an initial contingent royalty of up to $200 million. The royalty will only be payable once the Company has recovered its investment and development costs of Wards Well and if the average sales price achieved exceeds certain thresholds. No royalty is payable if the Company does not commence mining Wards Well. The Company will adjust the cost basis of the assets acquired if and when the contingent royalty is paid or becomes payable. North Antelope Rochelle Mine Tornado On June 23, 2023, the Company’s North Antelope Rochelle Mine sustained damage from a tornado which led to a temporary suspension of operations. The mine resumed operations on June 25, 2023. During the year ended December 31, 2023, the Company recorded a provision for loss of $12.2 million related to the tornado damage included in “Other operating loss” in the accompanying consolidated statements of operations. The combined provision included $4.0 million for materials and supplies inventories, $1.0 million for buildings and equipment and $7.2 million for incremental repair costs. During the year ended December 31, 2024, the Company recorded $3.7 million for incremental repair costs related to the tornado damage included in “Other operating loss” in the accompanying consolidated statements of operations. Shoal Creek On March 29, 2023, the Company’s Shoal Creek Mine experienced a fire. On June 20, 2023, the Company announced that the Shoal Creek Mine, in coordination with the Mine Safety and Health Administration, had safely completed localized sealing of the affected area of the mine. During the year ended December 31, 2023, the Company recorded a provision for loss of $28.7 million related to the fire, which included $17.8 million related to longwall development and other costs and $10.9 million for equipment deemed inoperable within the affected area of the mine. The provision for loss is included in “Other operating loss” in the accompanying consolidated statements of operations. In October 2023, the Company filed an insurance claim against applicable insurance policies with combined business interruption and property loss limits of $125 million above a $50 million deductible. During June 2024, the Company reached a settlement and recognized a $109.5 million insurance recovery, which the Company included in its results of operations during the year ended December 31, 2024. The Company collected all of the insurance recovery during the year ended December 31, 2024, and classified $10.9 million of the recovery within the “Cash Flows From Investing Activities” section of the consolidated statements of cash flows since this portion of the recovery related to equipment damage for which the Company previously recognized a provision for loss. Port and Rail Capacity Assignment During the year ended December 31, 2023, the Company entered into two agreements to assign the right to its excess port and rail capacity related to its Centurion Mine to unrelated parties. In the first transaction, the Company assigned its right in exchange for $30.0 million Australian dollars. Half of such amount was received by the Company upon entry into the agreement, and half was payable in June 2024, subject to certain conditions. In connection with the transaction, the Company recorded revenue of $19.2 million during the year ended December 31, 2023. In association with the completion of the Wards Well acquisition described above, the remaining receivable was settled as part of the consideration on April 16, 2024. In the second transaction, the Company assigned its right in exchange for $10.0 million Australian dollars, all of which was received as of December 31, 2023. In connection with the transaction, the Company recorded revenue of $6.7 million during the year ended December 31, 2023.