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Property, Plant, Equipment and Mine Development | 3 Months Ended
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Mar. 31, 2019
Property, Plant and Equipment [Abstract] |
Property, Plant, Equipment and Mine Development | Property, Plant, Equipment and Mine Development The composition of property, plant, equipment and mine development, net, as of March 31, 2019 and December 31, 2018 is set forth in the table below:
| March 31, 2019 |  | December 31, 2018
| (Dollars in millions)
Land and coal interests | $ | 4,149.8 |  |  | $ | 4,148.8 |
Buildings and improvements | 558.3 |  |  | 559.3 |
Machinery and equipment | 1,474.0 |  |  | 1,456.3 |
Less: Accumulated depreciation, depletion and amortization | (1,112.6 | ) |  | (957.4 | )
Property, plant, equipment and mine development, net | $ | 5,069.5 |  |  | $ | 5,207.0 |

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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