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FAIR VALUE MEASUREMENT: (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Liabilities:
Long-term debt, Carrying Value	$ 6,545.0	$ 6,544.2
Long-term debt, Fair Value	8,306.1	9,077.8
Short-term investment:
Trading securities	415.4	410.2
Available-for-sale debt securities:
Available-for-sale Securities, Current, Total	0.5	0.6
Quoted prices in active markets for identical assets (Level 1)
Liabilities:
Long-term debt, Carrying Value	6,194.3	6,193.6
Long-term debt, Fair Value	7,925.0	8,692.1
Significant other observable inputs (Level 2)
Liabilities:
Long-term debt, Carrying Value	350.7	350.6
Long-term debt, Fair Value	381.1	385.7
Fair value measurements recurring | Fair value as of the end of the period
Short-term investment:
Trading securities	415.4	410.2
Derivative:
Total assets, fair value	1,079.0	1,031.9
Fair value measurements recurring | Fair value as of the end of the period | Copper
Derivative:
Provisionally priced sales	541.1	491.9
Fair value measurements recurring | Fair value as of the end of the period | Molybdenum
Derivative:
Provisionally priced sales	122.0	129.2
Fair value measurements recurring | Asset backed securities | Fair value as of the end of the period
Available-for-sale debt securities:
Available-for-sale debt securities	0.3	0.3
Fair value measurements recurring | Mortgage backed securities | Fair value as of the end of the period
Available-for-sale debt securities:
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	415.4	410.2
Derivative:
Total assets, fair value	1,078.5	1,031.3
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Copper
Derivative:
Provisionally priced sales	541.1	491.9
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Molybdenum
Derivative:
Provisionally priced sales	122.0	129.2
Fair value measurements recurring | Significant other observable inputs (Level 2)
Available-for-sale debt securities:
Available-for-sale Securities, Current, Total	0.5	0.6
Fair value measurements recurring | Significant other observable inputs (Level 2) | Asset backed securities
Available-for-sale debt securities:
Available-for-sale debt securities	0.3	0.3
Fair value measurements recurring | Significant other observable inputs (Level 2) | Mortgage backed securities
Available-for-sale debt securities:
Available-for-sale debt securities	$ 0.2	$ 0.3

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