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SHORT-TERM INVESTMENTS: (Tables)

12 Months Ended

Dec. 31, 2016

SHORT-TERM INVESTMENTS:

Schedule of short-term investments

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

		At December 31,
		2016			2015
Trading securities		$	49.2		$	600.2
Weighted average interest rate			2.2	%		0.71	%
Available-for-sale		$	2.1		$	3.3
Weighted average interest rate			0.78	%		0.72	%
​	​	​	​	​	​	​	​
Total		$	51.3		$	603.5
​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​

Summary of activities of short-term investments

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

		Years ended December 31,
		2016			2015
Trading:
Interest earned		$	1.5		$	1.5
Unrealized gain (loss) at December 31,		$	0.4		$	(0.1	)
Available-for-sale:
Interest earned			(*	)		(*	)
Investment redeemed		$	1.2		$	1.6

(*)           Less than $0.1 million

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

        At December 31, 2016 and 2015, contractual maturities of the available-for-sale debt securities are as follows (in millions):

		2016			2015
One year or less		$	—		$	0.2
Maturing after one year through five years			—			—
Maturing after five years through ten years			—			—
Due after 10 years			2.1			3.1
​	​	​	​	​	​	​	​
Total debt securities		$	2.1		$	3.3
​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​

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