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SHORT-TERM INVESTMENTS: (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Short-term investment:
Trading securities	$ 55.6		$ 49.5
Weighted average interest rate (as a percent)	1.90%		1.80%
Available-for-sale	$ 0.9		$ 1.0
Weighted average interest rate (as a percent)	0.70%		0.70%
Total	$ 56.5		$ 50.5
Trading :
Interest earned	0.1	$ 0.2
Unrealized (loss) gain at the end of the period	(0.1)	(0.1)
Available-for-sale:
Interest earned	2.6	0.9
Investment redeemed	0.1
Maximum
Available-for-sale:
Interest earned	$ 0.1	0.1
Investment redeemed		$ 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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Amount of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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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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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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Amount of investments in debt securities classified as available-for-sale, expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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-Publisher FASB
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The cash inflow associated with the sale or maturity (principal being due) of securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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