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SHORT-TERM INVESTMENTS: (Tables) | 9 Months Ended
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Sep. 30, 2016
SHORT-TERM INVESTMENTS: |
Schedule of short-term investments | Short-term investments were as follows ($ in millions):
|  | At September 30, 2016 |  | At December 31, 2015 |
Trading securities |  | $ | 98.3 |  | $ | 600.2 |
Weighted average interest rate |  | 1.34 | % | 0.71 | %
Available-for-sale |  | $ | 2.5 |  | $ | 3.3 |
Weighted average interest rate |  | 0.80 | % | 0.72 | %
Total |  | $ | 100.8 |  | $ | 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 September 30, |  | Nine months ended September 30, |
|  | 2016 |  | 2015 |  | 2016 |  | 2015 |
Trading securities: |  |  |  |  |  |  |  |  |
Interest earned |  | $ | 0.3 |  | $ | 0.4 |  | $ | 1.0 |  | $ | 0.9 |
Unrealized gain (loss) at the end of the period |  | 0.3 |  | (* | ) | 0.3 |  | (* | )
Available-for-sale: |  |  |  |  |  |  |  |  |
Interest earned |  | (* | ) | (* | ) | (* | ) | (* | )
Investment redeemed |  | $ | 0.3 |  | $ | 0.2 |  | $ | 0.8 |  | $ | 0.8 |
(*) Less than $0.1 million

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