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v3.19.3.a.u2

Property, Plant, Equipment and Mine Development (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Property, Plant, Equipment and Mine Development[Line Items] |  |  |
Less: Accumulated depreciation, depletion and amortization | $ (1,409.8) | $ (957.4) |
Property, plant, equipment and mine development, net | 4,679.1 | 5,207.0 | $ 5,111.9
Coal reserves | 2,800.0 | 3,000.0 |
Coal reserves not subject to depletion | 100.0 | 200.0 |
Acquired interest in mineral rights | 100.0 | 100.0 |
Land and coal interests |  |  |
Property, Plant, Equipment and Mine Development[Line Items] |  |  |
Property, Plant and Equipment, Gross | 4,022.4 | 4,148.8 |
Buildings and improvements |  |  |
Property, Plant, Equipment and Mine Development[Line Items] |  |  |
Property, Plant and Equipment, Gross | 547.9 | 559.3 |
Machinery and equipment |  |  |
Property, Plant, Equipment and Mine Development[Line Items] |  |  |
Property, Plant and Equipment, Gross | 1,518.6 | 1,456.3 |
Mining Properties and Mineral Rights |  |  |
Property, Plant, Equipment and Mine Development[Line Items] |  |  |
Mineral rights and advanced royalties | 2,000.0 | 2,100.0 |
Coal Reserves Held by Fee Ownership |  |  |
Property, Plant, Equipment and Mine Development[Line Items] |  |  |
Coal reserves | $ 800.0 | $ 900.0 |

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