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SHORT-TERM INVESTMENTS: (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Short-term investment:
Trading securities	$ 235.8		$ 235.8		$ 49.5
Weighted average interest rate (as a percent)			2.20%		1.80%
Available-for-sale	0.7		$ 0.7		$ 1.0
Weighted average interest rate (as a percent)			0.70%		0.70%
Total	236.5		$ 236.5		$ 50.5
Trading securities:
Interest earned	0.1	$ 0.2	0.2	$ 0.6
Unrealized gain (loss) at the end of the period	(0.2)	0.1	(0.2)	0.1
Available-for-sale:
Interest earned	4.4	1.8	9.8	4.0
Investment redeemed	0.1	0.1	0.3	1.1
Maximum
Available-for-sale:
Interest earned	$ 0.1	$ 0.1	$ 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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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 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
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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating 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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