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SHORT-TERM INVESTMENTS: (Tables) | 12 Months Ended
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Dec. 31, 2020
SHORT-TERM INVESTMENTS: |
Schedule of short-term investments | Short-term investments were as follows ($ in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At December 31, |
​ | ​ | 2020 |  | 2019 |
Trading securities | ​ | $ | 410.2 | ​ | $ | 80.0 | ​
Weighted average interest rate | ​ |  | 0.4 | % |  | 2.0 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available-for-sale | ​ | $ | 0.6 | ​ | $ | 0.7 | ​
Weighted average interest rate | ​ |  | 0.7 | % |  | 0.7 | %
Total | ​ | $ | 410.8 | ​ | $ | 80.7 | ​
Summary of activity investments | The following table summarizes the activity of these investments by category (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended |
​ | ​ | December 31, | ​
​ | ​ | 2020 |  | 2019 |
Trading: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest earned | ​ | $ | 0.7 | ​ | $ | 0.6 | ​
Unrealized gain (loss) at the end of the period | ​ | $ | (*) | ​ | $ | (*) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available-for-sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest earned | ​ |  | (*) | ​ | ​ | (*) | ​
Investment redeemed | ​ | $ | 0.1 | ​ | $ | — | ​
(*) Less than $0.1 million
Schedule of contractual maturities of the Company's available-for-sale debt securities | At December 31, 2020 and 2019, contractual maturities of the available-for-sale debt securities are as follows (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019
One year or less | ​ | $ | — | ​ | $ | —
Maturing after one year through five years | ​ |  | — | ​ |  | —
Maturing after five years through ten years | ​ |  | — | ​ |  | —
Due after 10 years | ​ |  | 0.6 | ​ |  | 0.7
Total debt securities | ​ | $ | 0.6 | ​ | $ | 0.7

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