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SHORT-TERM INVESTMENTS: (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Short-term investment:
Trading securities	$ 486.5	$ 410.2
Weighted average interest rate (as a percent)	0.30%	0.40%
Available-for-sale	$ 0.4	$ 0.6
Weighted average interest rate (as a percent)	0.70%	0.70%
Total	$ 486.9	$ 410.8
Trading:
Interest earned	1.4	0.7
Unrealized gain (loss) at the end of the period	0.1
Available-for-sale:
Interest earned	7.2	19.2	$ 21.2
Investment redeemed	0.2	0.1
Contractual maturities of available-for-sale debt securities
Due after 10 years	0.4	0.6
Total debt securities	0.4	0.6
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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