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SHORT-TERM INVESTMENTS: (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Short-term investment: |  |  |  |  |
Trading securities | $ 118.0 |  | $ 118.0 |  | $ 213.1
Weighted average interest rate (as a percent) |  |  | 2.40% |  | 2.20%
Available-for-sale | 0.8 |  | $ 0.8 |  | $ 0.7
Weighted average interest rate (as a percent) |  |  | 0.70% |  | 0.70%
Total | 118.8 |  | $ 118.8 |  | $ 213.8
Trading: |  |  |  |  |
Interest earned |  | $ 0.1 | 0.1 | $ 0.1 |
Unrealized gain (loss) at the end of the period |  | (0.1) |  | (0.2) |
Available-for-sale: |  |  |  |  |
Interest earned | $ 4.4 | 2.8 | 8.1 | 5.4 |
Investment redeemed |  | $ 0.1 |  | 0.2 |
Maximum |  |  |  |  |
Available-for-sale: |  |  |  |  |
Interest earned |  |  | $ 0.1 | $ 0.1 |

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- Definition Represents the weighted average interest rate on debt and equity securities which are categorized neither as trading securities nor as held-to-maturity securities and that are intended be sold or will mature within one year from the balance sheet date or the normal operating cycle, whichever is longer. + References No definition available. + Details
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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=118942338&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=118954083&loc=d3e26626-111562 + Details
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