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BENEFIT PLANS: (Details 2) - Post retirement defined benefit plans $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 USD ($) entity $ / shares | Dec. 31, 2014
Expatriate Plan |  |
Benefit plans |  |
Net asset value (in dollars per share) | $ / shares | $ 1.00 |
Mexican Health Plan |  |
Assumptions used to determine the pension obligation and other post-retirement benefits and cost |  |
Number of financial institutions managing plan assets | entity | 3 |
Plan obligations as a percentage of benefit obligation | 30.00% |
Asset allocation (as a percent) | 100.00% | 100.00%
Expected employer contribution in next fiscal year | $ 7.2 |
Pending payments to former Buenavista workers | $ 3.4 |
Parent Company (Grupo Mexico) common shares | Mexican Health Plan |  |
Assumptions used to determine the pension obligation and other post-retirement benefits and cost |  |
Asset allocation (as a percent) | 79.00% |
Equity securities | Mexican Health Plan |  |
Assumptions used to determine the pension obligation and other post-retirement benefits and cost |  |
Asset allocation (as a percent) | 79.00% | 73.00%
Treasury bills | Mexican Health Plan |  |
Assumptions used to determine the pension obligation and other post-retirement benefits and cost |  |
Asset allocation (as a percent) | 21.00% | 27.00%

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- Definition Represents the buyout payments outstanding to workers under defined benefit plans. + References No definition available. + Details
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- Definition Represents the number of financial institutions managing the plan assets. + References No definition available. + Details
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- Definition Represents the plan obligation as a percentage of the entity's aggregate defined benefit obligation. + References No definition available. + Details
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- Definition Represents the company's net asset value per share. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Details
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