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FAIR VALUE MEASUREMENT: (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Liabilities:
Long-term debt, Carrying Value	$ 6,255.5	$ 6,254.6
Long-term debt, Fair Value	6,374.6	6,485.9
Short-term investment:
Trading securities	329.1	599.1
Available-for-sale:
Available-for-sale Securities, Current, Total	0.2	0.2
Quoted prices in active markets for identical assets (Level 1)
Liabilities:
Long-term debt, Carrying Value	6,204.3	6,203.4
Long-term debt, Fair Value	6,319.4	6,431.9
Significant other observable inputs (Level 2)
Liabilities:
Long-term debt, Carrying Value	51.2	51.2
Long-term debt, Fair Value	55.1	54.0
Fair value measurements recurring | Fair value as of the end of the period
Short-term investment:
Trading securities	329.1	599.1
Derivative:
Total assets, fair value	712.7	1,521.7
Fair value measurements recurring | Fair value as of the end of the period | Copper
Derivative:
Provisionally priced sales	273.4	657.5
Fair value measurements recurring | Fair value as of the end of the period | Molybdenum
Derivative:
Provisionally priced sales	110.0	264.9
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	0.1	0.1
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1)
Short-term investment:
Trading securities	329.1	599.1
Derivative:
Total assets, fair value	712.5	1,521.5
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Copper
Derivative:
Provisionally priced sales	273.4	657.5
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Molybdenum
Derivative:
Provisionally priced sales	110.0	264.9
Fair value measurements recurring | Significant other observable inputs (Level 2)
Available-for-sale:
Available-for-sale Securities, Current, Total	0.2	0.2
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	$ 0.1	$ 0.1

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