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Asset Impairment	12 Months Ended
	Dec. 31, 2020
Asset Impairment Charges [Abstract]
Asset Impairment	Asset Impairment During the year ended December 31, 2022, the Company recognized impairment charges of $9.5 million related to the sale of certain land interests in Australia and $1.7 million related to the fair value of an investment in equity securities. No asset impairment charges were recognized during the year ended December 31, 2021. During the year ended December 31, 2020, the Company recognized impairment charges of $1,418.1 million related to its North Antelope Rochelle Mine of the Powder River Basin Mining segment. Of this amount, $1,393.7 million related to the property, plant, equipment and mine development assets; $19.9 million related to operating lease right-of-use assets; and $4.5 million related to contract-based intangible assets. The outlook for the North Antelope Rochelle Mine was negatively impacted by the accelerated decline of coal-fired electricity generation in the U.S., driven by the reduced utilization of plants and plant retirements, sustained low natural gas pricing and the increased use of renewable energy sources. These factors led to the expectation of reduced future sales volumes. The impairment charge was based upon the remaining estimated discounted cash flows of the mine. Such cash flows were based upon estimates which generally constitute unobservable Level 3 inputs under the fair value hierarchy, including, but not limited to, future tons sold, coal prices for unpriced coal, production costs (including costs for labor, commodity supplies and contractors), transportation costs and a risk-adjusted cost of capital. During the year ended December 31, 2020, the Company also recognized impairment charges of $69.3 million related to certain unassigned coal reserves and resources in the Midwest due to their low probability of development.

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The entire disclosure for the details of the charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value. Disclosure may also include a description of the impaired asset and facts and circumstances leading to the impairment, amount of the impairment loss and where the loss is located in the income statement, method(s) for determining fair value, and the segment in which the impaired asset is reported.

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