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SHORT-TERM INVESTMENTS: (Tables) | 6 Months Ended
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Jun. 30, 2013
SHORT-TERM INVESTMENTS: |
Schedule of short-term investments | Short-term investments were as follows ($ in millions):
|  | At June 30, 2013 |  | At December 31, 2012 |
Trading securities |  | $ | 386.8 |  | $ | 127.8 |
Weighted average interest rate |  | 2.05 | % | 1.87 | %
Available for sale |  | $ | 6.1 |  | $ | 6.5 |
Weighted average interest rate |  | 0.41 | % | 0.43 | %
Total |  | $ | 392.9 |  | $ | 134.3 |
Summary of activities in 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, |
|  | 2013 |  | 2012 |  | 2013 |  | 2012 |
Trading securities: |  |  |  |  |  |  |  |  |
Interest earned |  | $ | 1.4 |  | $ | 0.9 |  | $ | 2.0 |  | $ | 1.6 |
Unrealized gain (loss) |  | (0.1 | ) | 0.1 |  | 1.0 |  | 5.1 |
Available for sale: |  |  |  |  |  |  |  |  |
Interest earned |  | (* | ) | (* | ) | (* | ) | (* | )
Investment redeemed |  | $ | 0.4 |  | $ | 0.9 |  | $ | 0.4 |  | $ | 1.2 |
(*) Less than $0.1 million

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