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FAIR VALUE MEASUREMENT (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Liabilities:
Long-term debt, Carrying Value	$ 6,548.5	$ 6,547.6
Long-term debt, Fair Value	7,721.6	8,573.2
Short-term investment:
Trading securities	406.1	486.5
Available-for-sale:
Available-for-sale Securities, Current, Total	0.4	0.4
Quoted prices in active markets for identical assets (Level 1)
Liabilities:
Long-term debt, Carrying Value	6,497.3	6,496.4
Long-term debt, Fair Value	7,657.2	8,506.0
Significant other observable inputs (Level 2)
Liabilities:
Long-term debt, Carrying Value	51.2	51.2
Long-term debt, Fair Value	64.4	67.2
Fair value measurements recurring | Fair value as of the end of the period
Short-term investment:
Trading securities	406.1	486.5
Derivative:
Total assets, fair value	1,625.3	1,651.4
Fair value measurements recurring | Fair value as of the end of the period | Copper
Derivative:
Provisionally priced sales	950.6	876.2
Fair value measurements recurring | Fair value as of the end of the period | Molybdenum
Derivative:
Provisionally priced sales	268.2	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	0.2	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	406.1	486.5
Derivative:
Total assets, fair value	1,624.9	1,651.0
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Copper
Derivative:
Provisionally priced sales	950.6	876.2
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Molybdenum
Derivative:
Provisionally priced sales	268.2	288.3
Fair value measurements recurring | Significant other observable inputs (Level 2)
Available-for-sale:
Available-for-sale Securities, Current, Total	0.4	0.4
Fair value measurements recurring | Significant other observable inputs (Level 2) | Asset backed securities
Available-for-sale:
Available-for-sale debt securities	0.2	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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