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SHORT-TERM INVESTMENTS: (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Short-term investment:
Trading securities	$ 49.5	$ 49.2
Weighted average interest rate (as a percent)	1.80%	2.20%
Available-for-sale	$ 1.0	$ 2.1
Weighted average interest rate (as a percent)	0.70%	0.78%
Total	$ 50.5	$ 51.3
Trading :
Interest earned	0.7	1.5
Unrealized gain (loss) at the end of the period	0.1	0.4
Available-for-sale:
Investment redeemed	1.1	1.2
Contractual maturities of available-for-sale debt securities
Due after 10 years	1.0	2.1
Total debt securities	1.0	2.1
Maximum
Available-for-sale:
Interest earned	$ 0.1	$ 0.1

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- Definition

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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Fair value of available-for-sale debt securities maturing after the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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