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SHORT-TERM INVESTMENTS: (Tables) | 3 Months Ended
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Mar. 31, 2015
SHORT-TERM INVESTMENTS: |
Schedule of short-term investments | Short-term investments were as follows ($ in millions):
|  | At March 31, |  | At December 31, |
|  | 2015 |  | 2014 |
Trading securities |  | $ | 79.1 |  | $ | 333.7 |
Weighted average interest rate |  | 1.16 | % | 0.78 | %
Available-for-sale |  | $ | 4.7 |  | $ | 4.9 |
Weighted average interest rate |  | 0.46 | % | 0.44 | %
Total |  | $ | 83.8 |  | $ | 338.6 |
Summary of activities in short-term investments | The following table summarizes the activity of these investments by category (in millions):
|  | Three months ended March 31, |
|  | 2015 |  | 2014 |
Trading: |  |  |  |  |
Interest earned |  | $ | 0.3 |  | $ | 1.4 |
Unrealized gain (loss) at the end of the period |  | $ | 2.8 |  | $ | 2.2 |
Available-for-sale: |  |  |  |  |
Interest earned |  | (*) |  | (*) |
Investment redeemed |  | $ | 0.2 |  | $ | — |
(*) Less than $0.1 million.

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