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SHORT-TERM INVESTMENTS: (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Short-term investment: |  |  |
Trading securities | $ 208.0 | $ 486.5 |
Weighted average interest rate (as a percent) | 4.50% | 0.30% |
Available-for-sale | $ 0.3 | $ 0.4 |
Weighted average interest rate (as a percent) | 0.80% | 0.70% |
Total | $ 208.3 | $ 486.9 |
Trading: |  |  |
Interest earned | 4.4 | 1.4 |
Unrealized gain (loss) at the end of the period |  | 0.1 |
Available-for-sale: |  |  |
Interest earned | 35.0 | 7.2 | $ 19.2
Investment redeemed | 0.1 | 0.2 |
Contractual maturities of available-for-sale debt securities |  |  |
Due after 10 years | 0.3 | 0.4 |
Total debt securities | 0.3 | 0.4 |
Maximum |  |  |
Available-for-sale: |  |  |
Interest earned | $ 0.1 | $ 0.1 |

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