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FINANCIAL INSTRUMENTS: (Tables) | 9 Months Ended
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Sep. 30, 2016
FINANCIAL INSTRUMENTS: |
Schedule of carrying amount and estimated fair values of the Company's financial instruments | Consequently, such financial instruments are not included in the following table that provides information about the carrying amounts and estimated fair values of other financial instruments that are not measured at fair value in the condensed consolidated balance sheet as of September 30, 2016 and December 31, 2015 ($ in millions):
|  | At September 30, 2016 |  | At December 31, 2015 |
|  | Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value |
Liabilities: |  |  |  |  |  |  |  |  |
Long-term debt |  | $ | 5,953.5 |  | $ | 6,411.0 |  | $ | 5,951.5 |  | $ | 5,211.5 |
Schedule of fair values of assets and liabilities measured at fair value on a recurring basis | Fair values of assets and liabilities measured at fair value on a recurring basis were calculated as follows as of September 30, 2016 and December 31, 2015:
|  | Fair Value at Measurement Date Using: |
Description |  | Fair Value as of September 30, 2016 |  | Quoted prices in active markets for identical assets (Level 1) |  | Significant other observable inputs (Level 2) |  | Significant unobservable inputs (Level 3) |
Assets: |  |  |  |  |  |  |  |  |
Short-term investment: |  |  |  |  |  |  |  |  |
- Trading securities |  | $ | 98.3 |  | $ | 98.3 |  | $ | — |  | $ | — |
- Available-for-sale debt securities: |  |  |  |  |  |  |  |  |
Corporate bonds |  | 0.1 |  | — |  | 0.1 |  | — |
Mortgage backed securities |  | 2.4 |  | — |  | 2.4 |  | — |
Accounts receivable: |  |  |  |  |  |  |  |  |
- Embedded derivatives - Not classified as hedges: |  |  |  |  |  |  |  |  |
Provisionally priced sales: |  |  |  |  |  |  |  |  |
Copper |  | 454.7 |  | 454.7 |  | — |  | — |
Molybdenum |  | 110.6 |  | 110.6 |  | — |  | — |
Total |  | $ | 666.1 |  | $ | 663.6 |  | $ | 2.5 |  | $ | — |
|  | Fair Value at Measurement Date Using: |
Description |  | Fair Value as of December 31, 2015 |  | Quoted prices in active markets for identical assets (Level 1) |  | Significant other observable inputs (Level 2) |  | Significant unobservable inputs (Level 3) |
Assets: |  |  |  |  |  |  |  |  |
Short-term investment: |  |  |  |  |  |  |  |  |
- Trading securities |  | $ | 600.2 |  | $ | 600.2 |  | $ | — |  | $ | — |
- Available-for-sale debt securities: |  |  |  |  |  |  |  |  |
Corporate bonds |  | 0.2 |  | — |  | 0.2 |  | — |
Mortgage backed securities |  | 3.1 |  | — |  | 3.1 |  | — |
Accounts receivable: |  |  |  |  |  |  |  |  |
- Embedded derivatives - Not classified as hedges: |  |  |  |  |  |  |  |  |
Provisionally priced sales: |  |  |  |  |  |  |  |  |
Copper |  | 351.0 |  | 351.0 |  | — |  | — |
Molybdenum |  | 62.4 |  | 62.4 |  | — |  | — |
Total |  | $ | 1,016.9 |  | $ | 1,013.6 |  | $ | 3.3 |  | $ | — |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13476-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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