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SHORT-TERM INVESTMENTS: (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Short-term investment: |  |  |
Trading securities | $ 406.1 |  | $ 486.5
Weighted average interest rate (as a percent) | 0.40% |  | 0.30%
Available-for-sale | $ 0.4 |  | $ 0.4
Weighted average interest rate (as a percent) | 0.70% |  | 0.70%
Total | $ 406.5 |  | $ 486.9
Trading: |  |  |
Interest earned | 0.8 | $ 0.4 |
Unrealized gain (loss) at the end of the period | (0.1) | 0.1 |
Available-for-sale: |  |  |
Interest earned | 4.6 | 2.4 |
Investment redeemed |  | 0.1 |
Maximum |  |  |
Available-for-sale: |  |  |
Interest earned | $ 0.1 | $ 0.1 |

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124260329&loc=d3e26626-111562 + Details
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