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SHORT-TERM INVESTMENTS: (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025 | Dec. 31, 2025
Short term investment: |  |  |  |  |
Trading securities | $ 1,664.8 |  | $ 1,664.8 |  | $ 604.5
Weighted average interest rate (as a percent) |  |  | 3.90% |  | 4.10%
Available-for-sale | 0.1 |  | $ 0.1 |  | $ 0.1
Weighted average interest rate (as a percent) |  |  | 0.90% |  | 0.90%
Total | 1,664.9 |  | $ 1,664.9 |  | $ 604.6
Trading: |  |  |  |  |
Interest earned | 20.4 | $ 7.2 | 25.7 | $ 9.5 |
Maximum |  |  |  |  |
Trading: |  |  |  |  |
Unrealized gain (loss) at the end of the period | $ 0.1 | $ 0.1 | $ 0.1 | $ 0.1 |

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