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FAIR VALUE MEASUREMENT: (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Short term investments:
Trading securities	$ 575.8	$ 245.2
Carrying Value
Liabilities:
Total long-term debt	6,749.4	5,758.5
Fair Value
Liabilities:
Total long-term debt	6,906.1	5,706.7
Quoted prices in active markets for identical assets (Level 1) | Carrying Value
Liabilities:
Current portion of long term debt		499.8
Total long-term debt	6,698.3	5,707.3
Quoted prices in active markets for identical assets (Level 1) | Fair Value
Liabilities:
Current portion of long term debt		498.4
Total long-term debt	6,825.4	5,653.6
Significant other observable inputs (Level 2) | Carrying Value
Liabilities:
Total long-term debt	51.2	51.2
Significant other observable inputs (Level 2) | Fair Value
Liabilities:
Total long-term debt	80.7	53.1
Fair value measurements recurring | Maximum
Available-for-sale debt securities:
Available-for-sale debt securities	0.1
Fair value measurements recurring | Fair Value
Short term investments:
Trading securities	575.8	245.2
Derivative:
Total assets, fair value	2,296.0	1,109.3
Fair value measurements recurring | Fair Value | Copper
Derivative:
Provisionally priced sales	1,248.2	589.5
Fair value measurements recurring | Fair Value | Molybdenum
Derivative:
Provisionally priced sales	425.4	274.5
Fair value measurements recurring | Fair Value | Zinc
Derivative:
Provisionally priced sales	46.5
Fair value measurements recurring | Mortgage backed securities | Fair Value
Available-for-sale debt securities:
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 investments:
Trading securities	575.8	245.2
Derivative:
Total assets, fair value	2,295.9	1,109.2
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Copper
Derivative:
Provisionally priced sales	1,248.2	589.5
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Molybdenum
Derivative:
Provisionally priced sales	425.4	274.5
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Zinc
Derivative:
Provisionally priced sales	46.5
Fair value measurements recurring | Significant other observable inputs (Level 2)
Derivative:
Total assets, fair value	0.1	0.1
Fair value measurements recurring | Significant other observable inputs (Level 2) | Mortgage backed securities
Available-for-sale debt securities:
Available-for-sale debt securities	$ 0.1	$ 0.1

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