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SHORT-TERM INVESTMENTS: (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Short-term investment: |  |  |  |  |
Trading securities | $ 246.8 |  | $ 246.8 |  | $ 208.0
Weighted average interest rate (as a percent) |  |  | 5.50% |  | 4.50%
Available-for-sale | 0.3 |  | $ 0.3 |  | $ 0.3
Weighted average interest rate (as a percent) |  |  | 0.80% |  | 0.80%
Total | 247.1 |  | $ 247.1 |  | $ 208.3
Trading: |  |  |  |  |
Interest earned | 3.3 | $ 3.3 | 7.6 | $ 3.9 |
Available-for-sale: |  |  |  |  |
Interest earned | 20.8 | 7.8 | 65.3 | 16.7 |
Investment redeemed |  |  |  | 0.1 |
Maximum |  |  |  |  |
Available-for-sale: |  |  |  |  |
Interest earned | $ 0.1 | $ 0.1 | $ 0.1 | $ 0.1 |

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