The number of derivative contracts entered into during the period.

No definition available.

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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- References

No definition available.

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

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- References

No definition available.

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- Definition

Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

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- Definition

Fair value as of the balance sheet date of all price risk derivative assets not designated as hedging instruments.

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- References

No definition available.

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- References

No definition available.

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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FAIR VALUE MEASUREMENT: (Details) $ in Millions	3 Months Ended
FAIR VALUE MEASUREMENT: (Details) $ in Millions	Mar. 31, 2023 USD ($) item	Sep. 30, 2021 item	Dec. 31, 2022 USD ($)
Liabilities:
Long-term debt, Carrying Value	$ 6,252.0		$ 6,251.2
Long-term debt, Fair Value	6,440.7		6,426.8
Short-term investment:
Trading securities	140.3		208.0
Available-for-sale:
Available-for-sale Securities, Current, Total	$ 0.3		0.3
Derivative:
Number of derivative contracts entered \| item	2	2
Quoted prices in active markets for identical assets (Level 1)
Liabilities:
Long-term debt, Carrying Value	$ 6,200.8		6,200.0
Long-term debt, Fair Value	6,384.2		6,372.6
Significant other observable inputs (Level 2)
Liabilities:
Long-term debt, Carrying Value	51.2		51.2
Long-term debt, Fair Value	56.5		54.2
Fair value measurements recurring \| Fair value as of the end of the period
Short-term investment:
Trading securities	140.3		208.0
Derivative:
Total assets, fair value	1,370.1		1,717.2
Fair value measurements recurring \| Fair value as of the end of the period \| Copper
Derivative:
Provisionally priced sales	872.4		1,052.0
Fair value measurements recurring \| Fair value as of the end of the period \| Molybdenum
Derivative:
Provisionally priced sales	357.1		456.9
Fair value measurements recurring \| Asset backed securities \| Fair value as of the end of the period
Available-for-sale:
Available-for-sale debt securities	0.1		0.1
Fair value measurements recurring \| Mortgage backed securities \| Fair value as of the end of the period
Available-for-sale:
Available-for-sale debt securities	0.2		0.2
Fair value measurements recurring \| Quoted prices in active markets for identical assets (Level 1)
Short-term investment:
Trading securities	140.3		208.0
Derivative:
Total assets, fair value	1,369.8		1,716.9
Fair value measurements recurring \| Quoted prices in active markets for identical assets (Level 1) \| Copper
Derivative:
Provisionally priced sales	872.4		1,052.0
Fair value measurements recurring \| Quoted prices in active markets for identical assets (Level 1) \| Molybdenum
Derivative:
Provisionally priced sales	357.1		456.9
Fair value measurements recurring \| Significant other observable inputs (Level 2)
Available-for-sale:
Available-for-sale Securities, Current, Total	0.3		0.3
Fair value measurements recurring \| Significant other observable inputs (Level 2) \| Asset backed securities
Available-for-sale:
Available-for-sale debt securities	0.1		0.1
Fair value measurements recurring \| Significant other observable inputs (Level 2) \| Mortgage backed securities
Available-for-sale:
Available-for-sale debt securities	$ 0.2		$ 0.2