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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2018
Property, Plant and Equipment [Abstract] |
Property Plant And Equipment | PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment consist of the following:
| December 31,
(in millions) | 2018 |  | 2017
Land | $ | 321.5 |  |  | $ | 245.9 |
Mineral properties and rights | 4,478.2 |  |  | 3,540.4 |
Buildings and leasehold improvements | 2,760.9 |  |  | 2,473.0 |
Machinery and equipment(a) | 8,955.7 |  |  | 7,933.5 |
Construction in-progress | 2,164.7 |  |  | 1,793.0 |
| 18,681.0 |  |  | 15,985.8 |
Less: accumulated depreciation and depletion | 6,934.5 |  |  | 6,274.1 |
| $ | 11,746.5 |  |  | $ | 9,711.7 |
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(a) | Includes assets under capital leases of approximately $340.9 million and $345.0 million as of December 31, 2018 and 2017, respectively.
Depreciation and depletion expense was $878.2 million, $659.4 million and $703.8 million for 2018, 2017 and 2016, respectively. Capitalized interest on major construction projects was $22.1 million, $23.9 million and $38.5 million for 2018, 2017 and 2016.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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