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SHORT-TERM INVESTMENTS: (Tables)

12 Months Ended

Dec. 31, 2017

SHORT-TERM INVESTMENTS:

Schedule of short-term investments

        Short-term investments were as follows ($ in millions):

		At December 31,
		2017			2016
Trading securities		$	49.5		$	49.2
Weighted average interest rate			1.8	%		2.2	%
Available-for-sale		$	1.0		$	2.1
Weighted average interest rate			0.70	%		0.78	%
​	​	​	​	​	​	​	​
Total		$	50.5		$	51.3
​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​

Summary of activities of short-term investments

        The following table summarizes the activity of these investments by category (in millions):

		Years ended December 31,
		2017			2016
Trading:
Interest earned		$	0.7		$	1.5
Unrealized gain (loss) at December 31,		$	0.1		$	0.4
Available-for-sale:
Interest earned			(*	)		(*	)
Investment redeemed		$	1.1		$	1.2

(*)           Less than $0.1 million

Schedule of contractual maturities of the Company's available-for-sale debt securities

        At December 31, 2017 and 2016, contractual maturities of the available-for-sale debt securities are as follows (in millions):

		2017			2016
One year or less		$	—		$	—
Maturing after one year through five years			—			—
Maturing after five years through ten years			—			—
Due after 10 years			1.0			2.1
​	​	​	​	​	​	​	​
Total debt securities		$	1.0		$	2.1
​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​

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