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Environmental Trust Funds (Tables) | 12 Months Ended
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Dec. 31, 2017
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Schedule of Environmental Trust Funds |
|  | UNITED STATES DOLLAR |
|  | 2017 |  |  | 2016 |
Balance at beginning of the year |  |  | 44.5 |  |  |  | 35.0 |
Contributions from continuing operations |  |  | 8.6 |  |  |  | 7.5 |
Interest earned |  |  | 0.5 |  |  |  | 1.0 |
Translation adjustment |  |  | 1.9 |  |  |  | 1.0 |
Balance at end of the year |  |  | 55.5 |  |  |  | 44.5 |

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