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Investments in Marketable Securities (Tables) | 3 Months Ended
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Mar. 31, 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 |  | March 31, 2016 |  | December 31, 2015 |  | March 31, 2016
Cost | $ | 104.7 |  |  | $ | 94.0 |  |  | $ | 19.8 |  |  | $ | 57.7 |
Unrealized Gains | 77.6 |  |  | 59.2 |  |  | 1.9 |  |  | 4.1 |
Unrealized Losses | (1.8 | ) |  | (1.5 | ) |  | (2.3 | ) |  | (5.3 | )
Fair Value | $ | 180.5 |  |  | $ | 151.7 |  |  | $ | 19.4 |  |  | $ | 56.5 |

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