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SHORT-TERM INVESTMENTS: (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Short-term investment:
Trading securities	$ 599.1	$ 208.0
Weighted average interest rate (as a percent)	5.70%	4.50%
Available-for-sale	$ 0.2	$ 0.3
Weighted average interest rate (as a percent)	0.80%	0.80%
Total	$ 599.3	$ 208.3
Trading:
Interest earned	21.0	4.4
Available-for-sale:
Interest earned	86.6	35.0	$ 7.2
Investment redeemed	0.1	0.1
Contractual maturities of available-for-sale debt securities
Due after 10 years	0.2	0.3
Maximum
Available-for-sale:
Interest earned	$ 0.1	$ 0.1

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Represents the weighted average interest rate on debt and equity securities which are categorized neither as trading securities nor as held-to-maturity securities and that are intended be sold or will mature within one year from the balance sheet date or the normal operating cycle, whichever is longer.

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Represents the weighted average interest rate on trading securities which are bought and held principally for the purpose of selling them in the near term.

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Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing after tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of interest income, amortization of premium and accretion of discount, on investment in debt security measured at fair value with change in fair value recognized in net income (trading); classified as operating.

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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Amount of cash inflow from sale, maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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