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FAIR VALUE MEASUREMENT: (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Liabilities:
Long-term debt, Carrying Value	$ 6,550.3	$ 6,547.6
Long-term debt, Fair Value	6,211.4	8,573.2
Short-term investment:
Trading securities		486.5
Available-for-sale:
Available-for-sale Securities, Current, Total	0.3	0.4
Quoted prices in active markets for identical assets (Level 1)
Liabilities:
Long-term debt, Carrying Value	6,499.1	6,496.4
Long-term debt, Fair Value	6,152.7	8,506.0
Significant other observable inputs (Level 2)
Liabilities:
Long-term debt, Carrying Value	51.2	51.2
Long-term debt, Fair Value	58.7	67.2
Fair value measurements recurring | Fair value as of the end of the period
Short-term investment:
Trading securities		486.5
Derivative:
Total assets, fair value	1,234.4	1,651.4
Fair value measurements recurring | Fair value as of the end of the period | Copper
Derivative:
Provisionally priced sales	954.4	876.2
Fair value measurements recurring | Fair value as of the end of the period | Molybdenum
Derivative:
Provisionally priced sales	279.7	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		486.5
Derivative:
Total assets, fair value	1,234.1	1,651.0
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Copper
Derivative:
Provisionally priced sales	954.4	876.2
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Molybdenum
Derivative:
Provisionally priced sales	279.7	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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