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SHORT-TERM INVESTMENTS: (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Short-term investment: |  |  |  |  |
Trading securities | $ 545.3 |  | $ 545.3 |  | $ 410.2
Weighted average interest rate (as a percent) |  |  | 0.30% |  | 0.40%
Available-for-sale | 0.5 |  | $ 0.5 |  | $ 0.6
Weighted average interest rate (as a percent) |  |  | 0.70% |  | 0.70%
Total | 545.8 |  | $ 545.8 |  | $ 410.8
Trading: |  |  |  |  |
Interest earned | 0.2 |  | 0.7 | $ 0.4 |
Available-for-sale: |  |  |  |  |
Interest earned | 1.3 | $ 4.3 | 3.7 | 12.2 |
Investment redeemed |  |  | 0.1 | 0.1 |
Maximum |  |  |  |  |
Available-for-sale: |  |  |  |  |
Interest earned | $ 0.1 | $ 0.1 | $ 0.1 | $ 0.1 |

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