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SHORT-TERM INVESTMENTS: (Tables) | 9 Months Ended
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Sep. 30, 2025
SHORT-TERM INVESTMENTS: |
Schedule of short-term investments | ​ Short-term investments were as follows (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At September 30, | ​ | At December 31, | ​ | ​
​ |  | 2025 |  | 2024 | ​ | ​
Trading securities | ​ | $ | 575.8 | ​ | $ | 245.2 | ​ | ​
Weighted average interest rate | ​ |  | 4.4 | % |  | 4.7 | % | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available-for-sale | ​ | $ | 0.1 | ​ | $ | 0.2 | ​ | ​
Weighted average interest rate | ​ |  | 0.9 | % |  | 0.9 | % | ​
Total | ​ | $ | 575.9 | ​ | $ | 245.3 | ​ | ​
Summary of trading investment activity | The following table summarizes trading investment activity (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Nine months ended | ​ |
​ | ​ | September 30, | ​ | September 30, | ​ | ​
​ |  | 2025 |  | 2024 |  | 2025 |  | 2024 | ​ |
Trading: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest earned | ​ | $ | 13.6 | ​ | $ | 8.0 | ​ | $ | 20.0 | ​ | $ | 18.6 | ​ | ​
Unrealized gain (loss) at the end of the period | ​ | $ | (*) | ​ | $ | (*) | ​ | $ | (*) | ​ | $ | (*) | ​ | ​
(*) Less than $0.1 million.

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- Definition Tabular disclosure of short-term investments which includes the carrying amount as of the balance sheet date and weighted average interest rate. + References No definition available. + Details
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