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ASSET RETIREMENT OBLIGATION: (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended | 1 Months Ended | 51 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2014 item Y | Mar. 31, 2013 | Dec. 31, 2012 | Jan. 31, 2014 Mexican operations | Mar. 31, 2014 Mexican operations
ASSET RETIREMENT OBLIGATION: |  |  |  |  |
Period after which successive reviews are required by the law (in years) | 5 |  |  |  |
Accepted value of the Lima office building | $ 27.8 |  |  |  |
Cumulative guarantee amount | 14.2 |  |  |  |
Number of units with future closure costs recognized as an asset retirement obligation | 3 |  |  |  |
Environmental costs |  |  |  |  |
Increase in plant demolition and soil remediation budgeted cost |  |  |  | 26.7 |
Plant demolition and soil remediation budgeted cost |  |  |  |  | 62.4
Plant demolition and soil cost recognized |  |  |  |  | 36.4
Increase to net property due to closure of mine |  |  | 20.3 |  |
Asset retirement obligation activity |  |  |  |  |
Balance at the beginning of the period | 124.8 | 122.3 |  |  |
Changes in estimates | 26.7 |  |  |  |
Additions |  |  | 25.1 |  |
Payments | (1.5) | (1.9) |  |  |
Accretion expense | 2.0 | 1.8 |  |  |
Balance at the end of the period | $ 152.0 | $ 122.2 | $ 122.3 |  |

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- Definition Represents the increase in total anticipated costs with respect to site restoration or other environmental exit costs that may occur on the sale, disposal, or abandonment of property. + References No definition available. + Details
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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Asset Retirement Obligation -URI http://asc.fasb.org/extlink&oid=6505190 + Details
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- Definition Amount of asset retirement obligations incurred during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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