FAIR VALUE MEASUREMENT (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Liabilities:
Long-term debt, Carrying Value	$ 6,547.6	$ 6,544.2
Long-term debt, Fair Value	8,573.2	9,077.8
Short-term investment:
Trading securities	486.5	410.2
Available-for-sale:
Available-for-sale debt securities	0.4	0.6
Available-for-sale Securities, Current, Total	0.4	0.6
Quoted prices in active markets for identical assets (Level 1)
Liabilities:
Long-term debt, Carrying Value	6,496.4	6,193.6
Long-term debt, Fair Value	8,506.0	8,692.1
Significant other observable inputs (Level 2)
Liabilities:
Long-term debt, Carrying Value	51.2	350.6
Long-term debt, Fair Value	67.2	385.7
Fair value measurements recurring \| Fair value as of the end of the period
Short-term investment:
Trading securities	486.5	410.2
Derivative:
Total assets, fair value	1,651.4	1,031.9
Fair value measurements recurring \| Fair value as of the end of the period \| Copper
Derivative:
Provisionally priced sales	876.2	491.9
Fair value measurements recurring \| Fair value as of the end of the period \| Molybdenum
Derivative:
Provisionally priced sales	288.3	129.2
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	0.3
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	0.3
Fair value measurements recurring \| Quoted prices in active markets for identical assets (Level 1)
Short-term investment:
Trading securities	486.5	410.2
Derivative:
Total assets, fair value	1,651.0	1,031.3
Fair value measurements recurring \| Quoted prices in active markets for identical assets (Level 1) \| Copper
Derivative:
Provisionally priced sales	876.2	491.9
Fair value measurements recurring \| Quoted prices in active markets for identical assets (Level 1) \| Molybdenum
Derivative:
Provisionally priced sales	288.3	129.2
Fair value measurements recurring \| Significant other observable inputs (Level 2)
Available-for-sale:
Available-for-sale Securities, Current, Total	0.4	0.6
Fair value measurements recurring \| Significant other observable inputs (Level 2) \| Asset backed securities
Available-for-sale:
Available-for-sale debt securities	0.2	0.3
Fair value measurements recurring \| Significant other observable inputs (Level 2) \| Mortgage backed securities
Available-for-sale:
Available-for-sale debt securities	$ 0.2	$ 0.3

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