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INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE - Equity Method Investments (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Corporate Venture |  |
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE |  |
Ownership interest (as a percent) | 100.00% |
MSC |  |
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE |  |
Ownership interest (as a percent) | 49.00% |
Results of operations | $ 2.3 | $ 0.2
Dividends received | $ 2.0 | $ 4.9

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