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SHORT-TERM INVESTMENTS: (Tables)

3 Months Ended

Mar. 31, 2021

SHORT-TERM INVESTMENTS:

Schedule of short-term investments

​

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

​	​	​	​	​	​	​	​	​
​	​	At March 31,		​	At December 31,		​	​
​		2021			2020		​	​
Trading securities	​	$	415.4	​	$	410.2	​	​
Weighted average interest rate	​		0.3	%		0.4	%	​
​	​	​	​	​	​	​	​	​
Available-for-sale	​	$	0.5	​	$	0.6	​	​
Weighted average interest rate	​		0.7	%		0.7	%	​
Total	​	$	415.9	​	$	410.8	​	​

Summary of activity investments

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

​

​	​	​	​	​	​	​	​	​
​	​	Three months ended					​
​	​	March 31,					​	​
​		2021			2020		​
Trading:	​	​	​	​	​	​	​	​
Interest earned	​	$	0.4	​	$	0.7	​	​
Unrealized gain (loss) at the end of the period	​	$	0.1	​	$	(*)	​	​
​	​	​	​	​	​	​	​	​
Available-for-sale:	​	​	​	​	​	​	​	​
Interest earned	​		(*)	​	​	(*)	​	​
Investment redeemed	​	$	0.1	​	$	0.1	​	​

(*) Less than $0.1 million.

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