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SHORT-TERM INVESTMENTS: (Tables) | 6 Months Ended
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Jun. 30, 2021
SHORT-TERM INVESTMENTS: |
Schedule of short-term investments | ​ Short-term investments were as follows (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At June 30, | ​ | At December 31, | ​ | ​
​ |  | 2021 |  | 2020 | ​ | ​
Trading securities | ​ | $ | 545.3 | ​ | $ | 410.2 | ​ | ​
Weighted average interest rate | ​ |  | 0.3 | % |  | 0.4 | % | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available-for-sale | ​ | $ | 0.5 | ​ | $ | 0.6 | ​ | ​
Weighted average interest rate | ​ |  | 0.7 | % |  | 0.7 | % | ​
Total | ​ | $ | 545.8 | ​ | $ | 410.8 | ​ | ​
Summary of activity investments | The following table summarizes the activity of these investments by category (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Six months ended | ​ |
​ | ​ | June 30, | ​ | June 30, | ​ | ​
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020 | ​ |
Trading: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest earned | ​ | $ | 0.2 | ​ | $ | (*) | ​ | $ | 0.7 | ​ | $ | 0.4 | ​ | ​
Unrealized gain (loss) at the end of the period | ​ | $ | (*) | ​ | $ | (*) | ​ | $ | (*) | ​ | $ | (*) | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available-for-sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest earned | ​ | $ | (*) | ​ | $ | (*) | ​ | $ | (*) | ​ | $ | (*) | ​ | ​
Investment redeemed | ​ | $ | — | ​ | $ | — | ​ | $ | 0.1 | ​ | $ | 0.1 | ​ | ​
(*) Less than $0.1 million.

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