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SHORT-TERM INVESTMENTS: (Tables) | 3 Months Ended
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Mar. 31, 2022
SHORT-TERM INVESTMENTS: |
Schedule of short-term investments | ​ Short-term investments were as follows (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At March 31, | ​ | At December 31, | ​ | ​
​ |  | 2022 |  | 2021 | ​ | ​
Trading securities | ​ | $ | 406.1 | ​ | $ | 486.5 | ​ | ​
Weighted average interest rate | ​ |  | 0.4 | % |  | 0.3 | % | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available-for-sale | ​ | $ | 0.4 | ​ | $ | 0.4 | ​ | ​
Weighted average interest rate | ​ |  | 0.7 | % |  | 0.7 | % | ​
Total | ​ | $ | 406.5 | ​ | $ | 486.9 | ​ | ​
Summary of activity investments | The following table summarizes the activity of these investments by category (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ |
​ | ​ | March 31, | ​ | ​
​ |  | 2022 |  | 2021 | ​ |
Trading: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest earned | ​ | $ | 0.8 | ​ | $ | 0.4 | ​ | ​
Unrealized gain (loss) at the end of the period | ​ | $ | (0.1) | ​ | $ | 0.1 | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available-for-sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest earned | ​ |  | (*) | ​ | ​ | (*) | ​ | ​
Investment redeemed | ​ | $ | (*) | ​ | $ | 0.1 | ​ | ​
(*) 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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