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Investments in Marketable Securities (Tables) | 6 Months Ended
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Jun. 30, 2019
Marketable Securities [Abstract] |
Schedule of Investments in Marketable Securities | The following is a summary of the cost, gross unrealized gains, unrealized losses and fair value of Investments in marketable securities:
| December 31, 2018 |  | June 30, 2019
Cost | $ | 126.8 |  |  | $ | 31.7 |
Unrealized gains | 1.1 |  |  | 2.3 |
Unrealized losses | (8.6 | ) |  | (0.1 | )
Fair value | $ | 119.3 |  |  | $ | 33.9 |

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
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