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SHORT-TERM INVESTMENTS: (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Short-term investment:
Trading securities	$ 212.7		$ 213.1
Weighted average interest rate (as a percent)	2.50%		2.20%
Available-for-sale	$ 0.8		$ 0.7
Weighted average interest rate (as a percent)	0.70%		0.70%
Total	$ 213.5		$ 213.8
Trading:
Interest earned	0.1	$ 0.1
Unrealized (loss) gain at the end of the period	(0.1)	(0.1)
Available-for-sale:
Interest earned	3.7	2.6
Investment redeemed		0.1
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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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

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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 before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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Amount of cash inflow from sale, maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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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 investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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