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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2017
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Note 7. Property, Plant and Equipment The major categories of property, plant and equipment and accumulated depreciation and depletion are presented below:
|  | December 31, |
|  | 2017 |  |  | 2016 |
|  | (millions of dollars) |
Mineral rights and reserves |  | $ | 545.9 |  |  | $ | 547.8 |
Land |  |  | 44.5 |  |  |  | 42.7 |
Buildings |  |  | 199.6 |  |  |  | 195.6 |
Machinery and equipment |  |  | 1,247.5 |  |  |  | 1,193.6 |
Furniture and fixtures and other |  |  | 132.3 |  |  |  | 123.3 |
Construction in progress |  |  | 49.8 |  |  |  | 38.4 |
|  |  | 2,219.6 |  |  |  | 2,141.4 |
Less: accumulated depreciation and depletion |  |  | (1,158.3 | ) |  |  | (1,089.6 | )
Property, plant and equipment, net |  | $ | 1,061.3 |  |  | $ | 1,051.8 |
Depreciation and depletion expense for the years ended December 31, 2017, 2016 and 2015 was $75.6 million, $75.4 million and $82.1 million, respectively.

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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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