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FAIR VALUE MEASUREMENT: (Tables) | 9 Months Ended
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Sep. 30, 2025
FAIR VALUE MEASUREMENT: |
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, which 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, 2025 and December 31, 2024 (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At September 30, 2025 | ​ | At December 31, 2024
​ |  | Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value
Liabilities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Current portion of long-term debt level 1 | ​ | $ | — | ​ | $ | — | ​ | $ | 499.8 | ​ | $ | 498.4
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Long-term debt level 1 | ​ | ​ | 6,698.3 | ​ | ​ | 6,825.4 | ​ | ​ | 5,707.3 | ​ | $ | 5,653.6
Long-term debt level 2 | ​ | ​ | 51.2 | ​ | ​ | 80.7 | ​ | ​ | 51.2 | ​ | ​ | 53.1
Total long-term debt | ​ | $ | 6,749.4 | ​ | $ | 6,906.1 | ​ | $ | 5,758.5 | ​ | $ | 5,706.7
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, 2025 and December 31, 2024 (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value at Measurement Date Using:
​ |  | ​ | ​ |  | ​ | ​ |  | Significant |  | ​ | ​
​ | ​ | Fair Value | ​ | Quoted prices in | ​ | other | ​ | Significant
​ | ​ | as of | ​ | active markets for | ​ | observable | ​ | unobservable
​ | ​ | September 30, | ​ | identical assets | ​ | inputs | ​ | inputs
Description | ​ | 2025 | ​ | (Level 1) | ​ | (Level 2) | ​ | (Level 3)
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Short term investment: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
—Trading securities | ​ | $ | 575.8 | ​ | $ | 575.8 | ​ | $ | — | ​ | $ | —
—Available-for-sale debt securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Corporate bonds | ​ |  | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Asset backed securities | ​ |  | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Mortgage backed securities | ​ |  | 0.1 | ​ | ​ | — | ​ | ​ | 0.1 | ​ | ​ | —
Accounts receivable: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
—Embedded derivatives—Not classified as hedges: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Provisionally priced sales: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Copper | ​ |  | 1,248.2 | ​ |  | 1,248.2 | ​ | ​ | — | ​ | ​ | —
Molybdenum | ​ | ​ | 425.4 | ​ | ​ | 425.4 | ​ | ​ | — | ​ | ​ | —
Zinc | ​ |  | 46.5 | ​ |  | 46.5 | ​ |  | — | ​ | ​ | —
Total | ​ | $ | 2,296.0 | ​ | $ | 2,295.9 | ​ | $ | 0.1 | ​ | $ | —
(*) Less than $0.1 million ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value at Measurement Date Using:
​ |  | ​ | ​ |  | ​ | ​ |  | Significant |  | ​ | ​
​ | ​ | Fair Value | ​ | Quoted prices in | ​ | other | ​ | Significant
​ | ​ | as of | ​ | active markets for | ​ | observable | ​ | unobservable
​ | ​ | December 31, | ​ | identical assets | ​ | inputs | ​ | inputs
Description | ​ | 2024 | ​ | (Level 1) | ​ | (Level 2) | ​ | (Level 3)
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Short term investment: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
—Trading securities | ​ | $ | 245.2 | ​ | $ | 245.2 | ​ | $ | — | ​ | $ | —
—Available-for-sale debt securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Asset backed securities | ​ |  | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Mortgage backed securities | ​ |  | 0.1 | ​ | ​ | — | ​ | ​ | 0.1 | ​ | ​ | —
Accounts receivable: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
—Embedded derivatives-Not classified as hedges: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Provisionally priced sales: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Copper | ​ |  | 589.5 | ​ |  | 589.5 | ​ | ​ | — | ​ | ​ | —
Molybdenum | ​ |  | 274.5 | ​ |  | 274.5 | ​ |  | — | ​ | ​ | —
Total | ​ | $ | 1,109.3 | ​ | $ | 1,109.2 | ​ | $ | 0.1 | ​ | $ | —

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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/exampleRef -Name Accounting Standards Codification -Section 55 -Paragraph 10 -SubTopic 10 -Topic 825 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-10 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-13 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-12 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-12 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 + 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/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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