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WORKERS' PARTICIPATION: (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2015 USD ($) item | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Statutory workers' participation |  |  |
Current | $ 140.8 | $ 221.2 | $ 201.6
Deferred | (19.8) | (11.4) | 31.4
Workers' participation expense (in USD) | $ 121.0 | 209.8 | $ 233.0
Peru |  |  |
Statutory workers' participation |  |  |
Provision for workers' participation as a percentage of pre-tax earnings | 8.00% |  |
Number of months for which an individual worker's salary is capped for consideration of annual individual worker participation | 18 months |  |
Maximum taxable units contributed by employer to benefit fund (in Peruvian taxable units) | item | 2,200 |  |
Maximum employer contribution to benefit fund (in USD) | $ 2.5 |  |
Mexico |  |  |
Statutory workers' participation |  |  |
Provision for workers' participation as a percentage of pre-tax earnings | 10.00% |  |
Deferred workers participation provision |  | $ 16.3 |

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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 Represents the maximum employer contribution to benefit fund. + References No definition available. + Details
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- Definition Represents the maximum taxable units contributed by employer to benefit fund. + References No definition available. + Details
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- Definition Represents the number of periods for which an individual worker's salary is capped for determining the maximum annual amount payable as worker's participation to each individual worker. + References No definition available. + Details
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- Definition Represents the provision for workers' participation. + References No definition available. + Details
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- Definition Represents the provision for workers' participation as a percentage of pre-tax earnings. + References No definition available. + Details
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- Definition Represents the workers' participation expenses incurred by the entity during the period. + References No definition available. + Details
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