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Investments in Marketable Securities (Tables) | 6 Months Ended
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Jun. 30, 2015
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 at December 31, 2014 and June 30, 2015:
| Available-for-Sale |  | Trading
| December 31, 2014 |  | June 30, 2015 |  | December 31, 2014 |  | June 30, 2015
Cost | $ | 125.6 |  |  | $ | 113.3 |  |  | $ | 19.5 |  |  | $ | 20.1 |
Unrealized Gains | 42.8 |  |  | 126.4 |  |  | 2.9 |  |  | 4.4 |
Unrealized Losses | (18.1 | ) |  | (2.6 | ) |  | (0.1 | ) |  | (0.1 | )
Fair Value | $ | 150.3 |  |  | $ | 237.1 |  |  | $ | 22.3 |  |  | $ | 24.4 |

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