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SHORT-TERM INVESTMENTS: (Tables) | 12 Months Ended
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Dec. 31, 2015
SHORT-TERM INVESTMENTS: |
Schedule of short-term investments | Short-term investments were as follows ($ in millions):
|  | At December 31, |
|  | 2015 |  | 2014 |
Trading securities |  | $ | 600.2 |  | $ | 333.7 |
Weighted average interest rate |  | 0.71 | % | 0.78 | %
Available-for-sale |  | $ | 3.3 |  | $ | 4.9 |
Weighted average interest rate |  | 0.72 | % | 0.44 | %
Total |  | $ | 603.5 |  | $ | 338.6 |
Summary of activities of short-term investments | The following table summarizes the activity of these investments by category (in millions):
|  | Years ended December 31, |
|  | 2015 |  | 2014 |
Trading: |  |  |  |  |
Interest earned |  | $ | 1.5 |  | $ | 4.3 |
Unrealized gain (loss) at December 31, |  | $ | (0.1 | ) | $ | 2.1 |
Available-for-sale: |  |  |  |  |
Interest earned |  | (* | ) | (* | )
Investment redeemed |  | $ | 1.6 |  | $ | 0.8 |
(*) Less than $0.1 million
Schedule of contractual maturities of the Company's available for sale debt securities | At December 31, 2015 and 2014, contractual maturities of the available-for-sale debt securities are as follows (in millions):
|  | 2015 |  | 2014 |
One year or less |  | $ | 0.2 |  | $ | 0.3 |
Maturing after one year through five years |  | — |  | — |
Maturing after five years through ten years |  | — |  | 0.1 |
Due after 10 years |  | 3.1 |  | 4.5 |
Total debt securities |  | $ | 3.3 |  | $ | 4.9 |

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