Other Events	9 Months Ended
Other Events	Sep. 30, 2024
Other Events [Abstract]
Other Events	Other Events Share Repurchases During the three and nine months ended September 30, 2024, the Company repurchased approximately 4.5 million shares and 7.7 million shares, respectively, of its common stock for $100.0 million and $180.5 million, respectively, including commission fees. The Company had accrued excise taxes of $5.0 million related to share repurchases, which were unpaid at September 30, 2024. The Company includes commission fees and excise taxes, as incurred, with the cost of treasury stock. At September 30, 2024, $469.6 million remained available under its share repurchase program. Wards Well Acquisition The Company entered into a definitive agreement dated October 26, 2023, to acquire the southern part of the Wards Well tenements (Wards Well) which are adjacent to the Company’s Centurion Mine in Queensland, Australia. The acquisition, which was accounted for as an asset acquisition, was completed on April 16, 2024. 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 condensed consolidated balance sheets as of September 30, 2024. The agreement also includes 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 three and nine months ended September 30, 2023, the Company recorded a provision for loss of $3.3 million and $8.3 million, respectively, related to the tornado damage. The combined provision includes $4.0 million for materials and supplies inventories, $1.0 million for buildings and equipment and $3.3 million for incremental repair costs. During the nine months ended September 30, 2024, the Company recorded $3.7 million for incremental repair costs related to the tornado damage. During the three months ended September 30, 2024, the Company did not record a provision related to the tornado damage. Shoal Creek On March 29, 2023, the Company’s Shoal Creek Mine experienced a fire involving void fill material utilized to stabilize the roof structure of the mine. 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 nine months ended September 30, 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. 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 with its insurers and various re-insurers and recognized a $109.5 million insurance recovery which the Company included in its results of operations during the nine months ended September 30, 2024. During the nine months ended September 30, 2024, the Company collected $103.8 million of the insurance recovery. The Company classified $10.9 million of the recovery within the “Cash Flows From Investing Activities” section of the unaudited condensed consolidated statements of cash flows since this portion of the recovery related to equipment damage for which the Company previously recognized the provision for loss. The remaining $5.7 million of the insurance recovery was recorded as a receivable within “Accounts receivable, net” in the condensed consolidated balance sheets as of September 30, 2024 and was subsequently collected in October 2024. Port and Rail Capacity Assignment During the nine months ended September 30, 2023, the Company entered into an agreement to assign the right to its excess port and rail capacity related to its Centurion Mine to an unrelated party 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 nine months ended September 30, 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.