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Investments in Marketable Securities | 6 Months Ended
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Jun. 30, 2014
Marketable Securities [Abstract] |
Investments in Marketable Securities | Investments in Marketable Securities Investments in marketable securities at December 31, 2013 and June 30, 2014 were $157.9 million and $149.0 million, respectively. 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, 2013 and June 30, 2014:
| Available-for-Sale |  | Trading
| December 31, 2013 |  | June 30, 2014 |  | December 31, 2013 |  | June 30, 2014
Cost | $ | 103.2 |  |  | $ | 106.8 |  |  | $ | 17.9 |  |  | $ | 15.5 |
Unrealized Gains | 33.3 |  |  | 20.4 |  |  | 4.6 |  |  | 8.1 |
Unrealized Losses | (1.1 | ) |  | (1.8 | ) |  | (0.0 | ) |  | — |
Fair Value | $ | 135.4 |  |  | $ | 125.4 |  |  | $ | 22.5 |  |  | $ | 23.6 |
The Company had no significant realized gains and losses on investments for the periods presented.

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