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Investments in Marketable Securities (Tables) | 6 Months Ended
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Jun. 30, 2020
Marketable Securities [Abstract] |
Schedule of Investments in Marketable Securities | The following is a summary of the cost, gross unrealized gains, gross unrealized losses and fair value of Investments in marketable securities:
| December 31, 2019 |  | June 30, 2020
Cost | $ | 57.9 |  |  | $ | 62.3 |
Unrealized gains | 2.1 |  |  | 1.7 |
Unrealized losses | (0.6 | ) |  | (2.6 | )
Fair value | $ | 59.4 |  |  | $ | 61.4 |

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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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