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Investments in Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2016
Marketable Securities [Abstract] |
Schedule of Available-For-Sale and Trading Securities | The following is a summary of the cost, gross unrealized gains and losses and fair value of investments classified as available-for-sale and trading:
| Available-for-Sale |  | Trading
| December 31, 2015 |  | September 30, 2016 |  | December 31, 2015 |  | September 30, 2016
Cost | $ | 104.7 |  |  | $ | 66.5 |  |  | $ | 19.8 |  |  | $ | 97.9 |
Unrealized gains | 77.6 |  |  | 40.5 |  |  | 1.9 |  |  | 11.5 |
Unrealized losses | (1.8 | ) |  | (0.5 | ) |  | (2.3 | ) |  | (2.7 | )
Fair Value | $ | 180.5 |  |  | $ | 106.5 |  |  | $ | 19.4 |  |  | $ | 106.7 |

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