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Investments in Marketable Securities (Tables) | 6 Months Ended
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Jun. 30, 2018
Marketable Securities [Abstract] |
Schedule of Investments in Marketable Securities | The following is a summary of the cost, gross unrealized gains and losses and fair value of investments in marketable securities:
| December 31, 2017 |  | June 30, 2018
Cost | $ | 67.1 |  |  | $ | 73.9 |
Unrealized gains | 13.0 |  |  | 12.5 |
Unrealized losses | (2.3 | ) |  | (2.3 | )
Fair value | $ | 77.8 |  |  | $ | 84.1 |

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