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PROPERTY, PLANT AND EQUIPMENT | 12 Months Ended
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Dec. 31, 2016
Property, Plant and Equipment [Abstract] |
PROPERTY, PLANT AND EQUIPMENT | NOTE 4 - PROPERTY, PLANT AND EQUIPMENT The following table indicates the value of each of the major classes of our consolidated depreciable assets as of December 31, 2016 and 2015:
| (In Millions)
| December 31,
| 2016 |  | 2015
Land rights and mineral rights | $ | 500.5 |  |  | $ | 500.5 |
Office and information technology | 65.1 |  |  | 71.0 |
Buildings | 67.9 |  |  | 60.4 |
Mining equipment | 592.2 |  |  | 594.0 |
Processing equipment | 552.0 |  |  | 516.8 |
Electric power facilities | 49.4 |  |  | 46.4 |
Land improvements | 23.5 |  |  | 24.8 |
Asset retirement obligation | 19.8 |  |  | 87.9 |
Other | 28.1 |  |  | 28.2 |
Construction in-progress | 42.8 |  |  | 40.3 |
| 1,941.3 |  |  | 1,970.3 |
Allowance for depreciation and depletion | (956.9 | ) |  | (911.3 | )
| $ | 984.4 |  |  | $ | 1,059.0 |
We recorded depreciation expense of $106.8 million, $119.2 million and $173.0 million in the Statements of Consolidated Operations for the years ended December 31, 2016, 2015 and 2014, respectively. For the year ended December 31, 2016, there were no factors present that indicated the carrying value of certain asset groups would not be recoverable; therefore, there were no impairments during 2016. Our asset groups consist of the assets and liabilities of our mines and associated reserves. The lowest level of identifiable cash flows largely are at the U.S. Iron Ore and Asia Pacific Iron Ore segment levels. For the year ended December 31, 2015, although certain factors indicated that the carrying value of certain asset groups may not be recoverable, an assessment was performed and no further impairment was indicated. During the second half of 2014, due to lower than previously expected profits as a result of decreased iron ore pricing expectations and increased costs, we determined that indicators of impairment with respect to certain of our long-lived assets or asset groups existed. As a result of these assessments during 2014, we determined that the future cash flows associated with our Asia Pacific Iron Ore asset group and other asset groups were not sufficient to support the recoverability of the carrying value of these productive assets. Accordingly, during 2014, an other long-lived asset impairment charge of $537.8 million was recorded as Impairment of goodwill and other long-lived assets in the Statements of Consolidated Operations related to property, plant and equipment. The fair value estimates were calculated using income and market approaches. The net book value of the land rights and mineral rights as of December 31, 2016 and 2015 is as follows:
| (In Millions)
| December 31,
| 2016 |  | 2015
Land rights | $ | 11.6 |  |  | $ | 11.6 |
Mineral rights: |  |  |
Cost | $ | 488.9 |  |  | $ | 488.9 |
Depletion | (112.2 | ) |  | (108.4 | )
Net mineral rights | $ | 376.7 |  |  | $ | 380.5 |
Accumulated depletion relating to mineral rights, which was recorded using the unit-of-production method, is included in Cost of goods sold and operating expenses. We recorded depletion expense of $3.8 million, $7.4 million and $79.6 million in the Statements of Consolidated Operations for the years ended December 31, 2016, 2015 and 2014, respectively. As discussed above, during 2014 we performed impairment assessments with respect to certain of our long-lived assets or asset groups. As a result of these assessments, we recorded an other long-lived asset impairment charge related to mineral rights of $297.2 million associated with our Asia Pacific Iron Ore asset group.

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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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13-14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64862545&loc=d3e2921-110230 Reference 4: http://www.xbrl.org/2003/role/presentationRef -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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