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Cash and Cash Equivalents (Tables) | 12 Months Ended
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Dec. 31, 2017
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Summary of Cash and Cash Equivalents | For the purpose of the consolidated statements of cash flows, cash and cash equivalents consist of the following:
|  | December 31 2017 $ |  |  | December 31 2016 $ |
Cash Unrestricted investments |  |  | 234.7 4.8 |  |  |  | 207.1 3.8 |
Cash and cash equivalents |  |  | 239.5 |  |  |  | 210.9 |

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