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SHORT-TERM INVESTMENTS: (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Short-term investment:
Trading securities	$ 80.0	$ 213.1
Weighted average interest rate (as a percent)	2.00%	2.20%
Available-for-sale	$ 0.7	$ 0.7
Weighted average interest rate (as a percent)	0.70%	0.70%
Total	$ 80.7	$ 213.8
Trading:
Interest earned	0.6	0.5
Unrealized gain (loss) at the end of the period		(0.2)
Available-for-sale:
Interest earned	21.2	16.0	$ 5.5
Investment redeemed		0.3
Contractual maturities of available-for-sale debt securities
Due after 10 years	0.7	0.7
Total debt securities	0.7	0.7
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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