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SHORT-TERM INVESTMENTS: (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Short-term investment: |  |  |
Trading securities | $ 599.1 | $ 208.0 |
Weighted average interest rate (as a percent) | 5.70% | 4.50% |
Available-for-sale | $ 0.2 | $ 0.3 |
Weighted average interest rate (as a percent) | 0.80% | 0.80% |
Total | $ 599.3 | $ 208.3 |
Trading: |  |  |
Interest earned | 21.0 | 4.4 |
Available-for-sale: |  |  |
Interest earned | 86.6 | 35.0 | $ 7.2
Investment redeemed | 0.1 | 0.1 |
Contractual maturities of available-for-sale debt securities |  |  |
Due after 10 years | 0.2 | 0.3 |
Maximum |  |  |
Available-for-sale: |  |  |
Interest earned | $ 0.1 | $ 0.1 |

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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing after tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 320 -Name Accounting Standards Codification -Section 50 -Paragraph 3A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480832/942-320-50-3A + Details
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