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SHORT-TERM INVESTMENTS: (Tables) | 9 Months Ended
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Sep. 30, 2024
SHORT-TERM INVESTMENTS: |
Schedule of short-term investments | ​ Short-term investments were as follows (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At September 30, | ​ | At December 31, | ​ | ​
​ |  | 2024 |  | 2023 | ​ | ​
Trading securities | ​ | $ | 318.6 | ​ | $ | 599.1 | ​ | ​
Weighted average interest rate | ​ |  | 5.5 | % |  | 5.7 | % | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available-for-sale | ​ | $ | 0.2 | ​ | $ | 0.2 | ​ | ​
Weighted average interest rate | ​ |  | 0.8 | % |  | 0.8 | % | ​
Total | ​ | $ | 318.8 | ​ | $ | 599.3 | ​ | ​
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, | ​ | ​
​ |  | 2024 |  | 2023 |  | 2024 |  | 2023 | ​ |
Trading: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest earned | ​ | $ | 8.0 | ​ | $ | 3.3 | ​ | $ | 18.6 | ​ | $ | 7.6 | ​ | ​
Unrealized gain (loss) at the end of the period | ​ | $ | (*) | ​ | $ | (*) | ​ | $ | (*) | ​ | $ | (*) | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available-for-sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest earned | ​ | $ | (*) | ​ | $ | (*) | ​ | $ | (*) | ​ | $ | (*) | ​ | ​
Investment redeemed | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | ​
(*) Less than $0.1 million.

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