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Property, Plant, Equipment and Mine Development (Tables) | 12 Months Ended
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Dec. 31, 2022
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | estimated useful lives of the building and improvements and machinery and equipment asset categories range from 1 to 30 years. The estimated life of leasehold improvements is the shorter of useful life or remaining life of the lease. Property, plant, equipment and mine development, net, as of December 31, 2022 and December 31, 2021 consisted of the following:
| December 31,
| 2022 |  | 2021
| (Dollars in millions)
Land and coal interests | $ | 2,514.7 |  |  | $ | 2,494.1 |
Buildings and improvements | 594.2 |  |  | 550.8 |
Machinery and equipment | 1,543.1 |  |  | 1,386.2 |
Less: Accumulated depreciation, depletion and amortization | (1,787.0) |  |  | (1,480.5) |
Property, plant, equipment and mine development, net | $ | 2,865.0 |  |  | $ | 2,950.6 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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