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SHORT-TERM INVESTMENTS: (Tables) | 3 Months Ended
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Mar. 31, 2016
SHORT-TERM INVESTMENTS: |
Schedule of short-term investments | Short-term investments were as follows ($ in millions):
|  | At March 31, |  | At December 31, |
|  | 2016 |  | 2015 |
Trading securities |  | $ | 279.6 |  | $ | 600.2 |
Weighted average interest rate |  | 0.87 | % | 0.71 | %
Available-for-sale |  | $ | 3.0 |  | $ | 3.3 |
Weighted average interest rate |  | 0.79 | % | 0.72 | %
Total |  | $ | 282.6 |  | $ | 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 March 31, |
|  | 2016 |  | 2015 |
Trading: |  |  |  |  |
Interest earned |  | $ | 0.4 |  | $ | 0.3 |
Unrealized gain at the end of the period |  | $ | 0.1 |  | $ | 2.8 |
Available-for-sale: |  |  |  |  |
Interest earned |  | (* | ) | (* | )
Investment redeemed |  | $ | 0.3 |  | $ | 0.2 |
(*) Less than $0.1 million.

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- Definition Tabular disclosure of short-term investments which includes the carrying amount as of the balance sheet date and weighted average interest rate. + References No definition available. + Details
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