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SHORT-TERM INVESTMENTS: (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Short-term investment:
Trading securities	$ 118.0		$ 118.0		$ 213.1
Weighted average interest rate (as a percent)			2.40%		2.20%
Available-for-sale	0.8		$ 0.8		$ 0.7
Weighted average interest rate (as a percent)			0.70%		0.70%
Total	118.8		$ 118.8		$ 213.8
Trading:
Interest earned		$ 0.1	0.1	$ 0.1
Unrealized gain (loss) at the end of the period		(0.1)		(0.2)
Available-for-sale:
Interest earned	$ 4.4	2.8	8.1	5.4
Investment redeemed		$ 0.1		0.2
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 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 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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