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Investment Income (Tables) | 12 Months Ended
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Dec. 31, 2017
Text block1 [abstract] |
Schedule of Investment Income |
|  | UNITED STATES DOLLAR |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  |  |  |  | Restated1 |  |  | Restated1 |
Interest received – environmental trust funds |  |  | 0.5 |  |  |  | 1.0 |  |  |  | 0.4 |
Interest received – cash balances |  |  | 5.1 |  |  |  | 7.3 |  |  |  | 5.9 |
Total investment income |  |  | 5.6 |  |  |  | 8.3 |  |  |  | 6.3 |

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