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SHORT-TERM INVESTMENTS: (Tables) | 3 Months Ended
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Mar. 31, 2014
SHORT-TERM INVESTMENTS: |
Schedule of short-term investments | Short-term investments were as follows ($ in millions):
|  | March 31, |  | December 31, |
|  | 2014 |  | 2013 |
Trading securities |  | $ | 267.3 |  | $ | 202.6 |
Weighted average interest rate |  | 1.87 | % | 3.78 | %
Available for sale |  | $ | 5.7 |  | $ | 5.7 |
Weighted average interest rate |  | 0.41 | % | 0.42 | %
Total |  | $ | 273.0 |  | $ | 208.3 |
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, |
|  | 2014 |  | 2013 |
Trading: |  |  |  |  |
Interest earned |  | $ | 1.4 |  | $ | 0.6 |
Unrealized gain (loss) at the end of the period |  | $ | 2.2 |  | $ | 3.5 |
Available-for-sale: |  |  |  |  |
Interest earned |  | (* | ) | (* | )
Investment redeemed |  | $ | — |  | $ | — |
(*) Less than $0.1 million.

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