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SHORT-TERM INVESTMENTS: | 3 Months Ended
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Mar. 31, 2022
SHORT-TERM INVESTMENTS: |
SHORT-TERM INVESTMENTS: | NOTE 2 — SHORT-TERM INVESTMENTS: ​ Short-term investments were as follows (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At March 31, | ​ | At December 31, | ​ | ​
​ |  | 2022 |  | 2021 | ​ | ​
Trading securities | ​ | $ | 406.1 | ​ | $ | 486.5 | ​ | ​
Weighted average interest rate | ​ |  | 0.4 | % |  | 0.3 | % | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available-for-sale | ​ | $ | 0.4 | ​ | $ | 0.4 | ​ | ​
Weighted average interest rate | ​ |  | 0.7 | % |  | 0.7 | % | ​
Total | ​ | $ | 406.5 | ​ | $ | 486.9 | ​ | ​
​ Trading securities consist of bonds issued by public companies and are publicly traded. Each financial instrument is independent of the others. The Company has the intention to sell these bonds in the short-term. ​ Available-for-sale investments consist of securities issued by public companies. Each security is independent of the others and as of March 31, 2022 and December 31, 2021, included asset and mortgage backed obligations. As of March 31, 2022 and December 31, 2021, gross unrealized gains and losses on available-for-sale securities were not material. ​ The Company earned interest related to these investments, which was recorded as interest income in the condensed consolidated statement of earnings. Also, the Company redeemed some of these securities and recognized gains (losses) due to changes in fair value, which were recorded as other income (expense) in the condensed consolidated statement of earnings. ​ The following table summarizes the activity of these investments by category (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ |
​ | ​ | March 31, | ​ | ​
​ |  | 2022 |  | 2021 | ​ |
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 | ​ |  | (*) | ​ | ​ | (*) | ​ | ​
Investment redeemed | ​ | $ | (*) | ​ | $ | 0.1 | ​ | ​
(*) Less than $0.1 million.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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