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SHORT-TERM INVESTMENTS: (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Short-term investment: |  |  |  |  |
Trading securities | $ 328.9 |  | $ 328.9 |  | $ 599.1
Weighted average interest rate (as a percent) |  |  | 5.50% |  | 5.70%
Available-for-sale | 0.2 |  | $ 0.2 |  | $ 0.2
Weighted average interest rate (as a percent) |  |  | 0.80% |  | 0.80%
Total | 329.1 |  | $ 329.1 |  | $ 599.3
Trading: |  |  |  |  |
Interest earned | 7.6 | $ 3.5 | 13.7 | $ 6.9 |
Available-for-sale: |  |  |  |  |
Interest earned | $ 26.5 | $ 23.2 | 53.8 | 44.5 |
Maximum |  |  |  |  |
Available-for-sale: |  |  |  |  |
Interest earned |  |  | $ 0.1 | $ 0.1 |

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