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SHORT-TERM INVESTMENTS: (Tables) | 6 Months Ended
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Jun. 30, 2016
SHORT-TERM INVESTMENTS: |
Schedule of short-term investments | Short-term investments were as follows ($ in millions):
|  | At June 30, 2016 |  | At December 31, 2015 |
Trading securities |  | $ | 95.4 |  | $ | 600.2 |
Weighted average interest rate |  | 1.41 | % | 0.71 | %
Available-for-sale |  | $ | 2.8 |  | $ | 3.3 |
Weighted average interest rate |  | 0.89 | % | 0.72 | %
Total |  | $ | 98.2 |  | $ | 603.5 |
Summary of activities of short-term investments | The following table summarizes the activity of these investments by category ($ in millions):
|  | Three months ended |  | Six months ended |
|  | June 30, |  | June 30, |
|  | 2016 |  | 2015 |  | 2016 |  | 2015 |
Trading securities: |  |  |  |  |  |  |  |  |
Interest earned |  | $ | 0.3 |  | $ | 0.2 |  | $ | 0.7 |  | $ | 0.5 |
Unrealized gain (loss) at the end of the period |  | $ | 0.4 |  | $ | (0.2 | ) | $ | 0.4 |  | $ | (0.2 | )
Available-for-sale: |  |  |  |  |  |  |  |  |
Interest earned |  | (* | ) | (* | ) | (* | ) | (* | )
Investment redeemed |  | $ | 0.2 |  | $ | 0.4 |  | $ | 0.5 |  | $ | 0.6 |
(*) Less than $0.1 million

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