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FAIR VALUE MEASUREMENT: (Tables)

12 Months Ended

Dec. 31, 2017

FAIR VALUE MEASUREMENT:

Schedule of carrying amount and estimated fair values of the Company's financial instruments

        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 consolidated balance sheet as of December 31, 2017 and December 31, 2016 (in millions):

		At December 31, 2017						At December 31, 2016
		Carrying Value			Fair Value			Carrying Value			Fair Value
Liabilities:
Long-term debt level 1			5,208.4			6,488.9			5,903.0			6,150.8
Long-term debt level 2			748.7			806.1			51.2			61.2
​	​	​	​	​	​	​	​	​	​	​	​	​	​
Total long-term debt		$	5,957.1		$	7,295.0		$	5,954.2		$	6,212.0

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 of December 31, 2017 and 2016, as follows (in millions):

Fair Value at Measurement Date Using:

Description

Fair Value as of December 31, 2017

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

$

49.5

$

49.5

—

$

—

—Available-for-sale debt securities:

Corporate bonds

0.1

—

$

0.1

—

Asset backed securities

0.5

—

0.5

—

Mortgage backed securities

0.4

—

0.4

—

Accounts receivable:

—Embedded derivatives—Not classified as hedges:

Provisionally priced sales:

Copper

184.6

184.6

—

—

Molybdenum

102.8

102.8

—

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Total

$

337.9

$

336.9

$

1.0

$

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

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​

​

​

​

​

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​

​

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Fair Value at Measurement Date Using:

Description

Fair Value as of December 31, 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

$

49.2

$

49.2

—

$

—

—Available-for-sale debt securities:

Corporate bonds

—

—

—

—

Asset backed securities

—

—

—

—

Mortgage backed securities

2.1

—

$

2.1

—

Accounts receivable:

—Embedded derivatives—Not classified as hedges:

Provisionally priced sales:

Copper

203.8

203.8

—

—

Molybdenum

54.0

54.0

—

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Total

$

309.1

$

307.0

$

2.1

$

—

​

​

​

​

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​

​

​

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X

- 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

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- References

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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

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