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FAIR VALUE MEASUREMENT: (Details) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2021 item	Dec. 31, 2022 USD ($) item	Dec. 31, 2021 USD ($)
Liabilities:
Long-term debt, Carrying Value		$ 6,251.2	$ 6,547.6
Long-term debt, Fair Value		6,426.8	8,573.2
Short-term investment:
Trading securities		208.0	486.5
Available-for-sale:
Available-for-sale debt securities		0.3	0.4
Available-for-sale Securities, Current, Total		$ 0.3	0.4
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		$ 6,200.0	6,496.4
Long-term debt, Fair Value		6,372.6	8,506.0
Significant other observable inputs (Level 2)
Liabilities:
Long-term debt, Carrying Value		51.2	51.2
Long-term debt, Fair Value		54.2	67.2
Fair value measurements recurring | Fair value as of the end of the period
Short-term investment:
Trading securities		208.0	486.5
Derivative:
Total assets, fair value		1,717.2	1,651.4
Fair value measurements recurring | Fair value as of the end of the period | Copper
Derivative:
Provisionally priced sales		1,052.0	876.2
Fair value measurements recurring | Fair value as of the end of the period | Molybdenum
Derivative:
Provisionally priced sales		456.9	288.3
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	0.2
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		208.0	486.5
Derivative:
Total assets, fair value		1,716.9	1,651.0
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Copper
Derivative:
Provisionally priced sales		1,052.0	876.2
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Molybdenum
Derivative:
Provisionally priced sales		456.9	288.3
Fair value measurements recurring | Significant other observable inputs (Level 2)
Available-for-sale:
Available-for-sale Securities, Current, Total		0.3	0.4
Fair value measurements recurring | Significant other observable inputs (Level 2) | Asset backed securities
Available-for-sale:
Available-for-sale debt securities		0.1	0.2
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

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