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SHORT-TERM INVESTMENTS: (Tables) | 9 Months Ended
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Sep. 30, 2018
SHORT-TERM INVESTMENTS: |
Schedule of short-term investments | Short-term investments were as follows ($ in millions):
|  | At September 30, |  | At December 31, |
|  | 2018 |  | 2017 |
Trading securities |  | $ | 235.8 |  | $ | 49.5 |
Weighted average interest rate |  | 2.2 | % | 1.8 | %
Available-for-sale |  | $ | 0.7 |  | $ | 1.0 |
Weighted average interest rate |  | 0.7 | % | 0.7 | %
Total |  | $ | 236.5 |  | $ | 50.5 |
Summary of activity investments | The following table summarizes the activity of these investments by category (in millions):
|  | Three months ended |  | Nine months ended |
|  | September 30, |  | September 30, |
|  | 2018 |  | 2017 |  | 2018 |  | 2017 |
Trading securities: |  |  |  |  |  |  |  |  |
Interest earned |  | $ | 0.1 |  | $ | 0.2 |  | $ | 0.2 |  | $ | 0.6 |
Unrealized gain (loss) at the end of the period |  | $ | (0.2 | ) | $ | 0.1 |  | $ | (0.2 | ) | $ | 0.1 |
Available-for-sale: |  |  |  |  |  |  |  |  |
Interest earned |  | (* | ) | (* | ) | (* | ) | (* | )
Investment redeemed |  | $ | 0.1 |  | $ | 0.1 |  | $ | 0.3 |  | $ | 1.1 |
(*) Less than $0.1 million.

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