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FAIR VALUE MEASUREMENT: (Details) $ in Millions	3 Months Ended	5 Months Ended
	Sep. 30, 2021 item	Mar. 31, 2022 item	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Liabilities:
Long-term debt, Carrying Value			$ 6,254.6	$ 6,251.2
Long-term debt, Fair Value			6,485.9	6,426.8
Short-term investment:
Trading securities			599.1	208.0
Available-for-sale:
Available-for-sale debt securities			0.2	0.3
Available-for-sale Securities, Current, Total			0.2	0.3
Derivative:
Number of derivative contracts entered | item	2	2
Quoted prices in active markets for identical assets (Level 1)
Liabilities:
Long-term debt, Carrying Value			6,203.4	6,200.0
Long-term debt, Fair Value			6,431.9	6,372.6
Significant other observable inputs (Level 2)
Liabilities:
Long-term debt, Carrying Value			51.2	51.2
Long-term debt, Fair Value			54.0	54.2
Fair value measurements recurring | Fair value as of the end of the period
Short-term investment:
Trading securities			599.1	208.0
Derivative:
Total assets, fair value			1,521.7	1,717.2
Fair value measurements recurring | Fair value as of the end of the period | Copper
Derivative:
Provisionally priced sales			657.5	1,052.0
Fair value measurements recurring | Fair value as of the end of the period | Molybdenum
Derivative:
Provisionally priced sales			264.9	456.9
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	0.2
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1)
Short-term investment:
Trading securities			599.1	208.0
Derivative:
Total assets, fair value			1,521.5	1,716.9
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Copper
Derivative:
Provisionally priced sales			657.5	1,052.0
Fair value measurements recurring | Quoted prices in active markets for identical assets (Level 1) | Molybdenum
Derivative:
Provisionally priced sales			264.9	456.9
Fair value measurements recurring | Significant other observable inputs (Level 2)
Available-for-sale:
Available-for-sale Securities, Current, Total			0.2	0.3
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	$ 0.2

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