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SHORT-TERM INVESTMENTS: (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Investments |  |  |  |  |
Trading securities | $ 98.3 |  | $ 98.3 |  | $ 600.2
Weighted average interest rate (as a percent) |  |  | 1.34% |  | 0.71%
Available-for-sale | 2.5 |  | $ 2.5 |  | $ 3.3
Weighted average interest rate (as a percent) |  |  | 0.80% |  | 0.72%
Total short-term investments | 100.8 |  | $ 100.8 |  | $ 603.5
Trading securities: |  |  |  |  |
Interest earned | 0.3 | $ 0.4 | 1.0 | $ 0.9 |
Unrealized gain (loss) at the end of the period | 0.3 |  | 0.3 |  |
Available-for-sale: |  |  |  |  |
Investment redeemed | 0.3 | 0.2 | 0.8 | 0.8 |
Maximum |  |  |  |  |
Trading securities: |  |  |  |  |
Unrealized gain (loss) at the end of the period |  | 0.1 |  | 0.1 |
Available-for-sale: |  |  |  |  |
Interest earned | $ 0.1 | $ 0.1 | $ 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 and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26626-111562 + Details
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