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SHORT-TERM INVESTMENTS: (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Investments |  |  |  |  |
Trading securities | $ 95.4 |  | $ 95.4 |  | $ 600.2
Weighted average interest rate (as a percent) |  |  | 1.41% |  | 0.71%
Available-for-sale | 2.8 |  | $ 2.8 |  | $ 3.3
Weighted average interest rate (as a percent) |  |  | 0.89% |  | 0.72%
Total short-term investments | 98.2 |  | $ 98.2 |  | $ 603.5
Trading securities: |  |  |  |  |
Interest earned | 0.3 | $ 0.2 | 0.7 | $ 0.5 |
Unrealized gain (loss) at the end of the period | 0.4 | (0.2) | 0.4 | (0.2) |
Available-for-sale: |  |  |  |  |
Investment redeemed | 0.2 | 0.4 | 0.5 | 0.6 |
Maximum |  |  |  |  |
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=51813488&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=49167202&loc=d3e26626-111562 + Details
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- Definition Amount of operating dividend and interest income, including amortization and accretion of premiums and discounts, on available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.2) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24721-111560 + Details
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- Definition Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph g -Article 7 + Details
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