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SHORT-TERM INVESTMENTS: (Tables)

12 Months Ended

Dec. 31, 2021

SHORT-TERM INVESTMENTS:

Schedule of short-term investments

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

​	​	​	​	​	​	​	​
​	​	At December 31,
​	​	2021			2020
Trading securities	​	$	486.5	​	$	410.2	​
Weighted average interest rate	​		0.3	%		0.4	%
​	​	​	​	​	​	​	​
Available-for-sale	​	$	0.4	​	$	0.6	​
Weighted average interest rate	​		0.7	%		0.7	%
Total	​	$	486.9	​	$	410.8	​

Summary of activity investments

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

​	​	​	​	​	​	​	​
​	​	Years ended
​	​	December 31,					​
​	​	2021			2020
Trading:	​	​	​	​	​	​	​
Interest earned	​	$	1.4	​	$	0.7	​
Unrealized gain (loss) at the end of the period	​	$	0.1	​	$	(*)	​
​	​	​	​	​	​	​	​
Available-for-sale:	​	​	​	​	​	​	​
Interest earned	​	$	(*)	​	$	(*)	​
Investment redeemed	​	$	0.2	​	$	0.1	​

(*)   Less than $0.1 million

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

At December 31, 2021 and 2020, contractual maturities of the available-for-sale debt securities are as follows (in millions):

​	​	​	​	​	​	​
​		2021			2020
One year or less	​	$	—	​	$	—
Maturing after one year through five years	​		—	​		—
Maturing after five years through ten years	​		—	​		—
Due after 10 years	​		0.4	​		0.6
Total debt securities	​	$	0.4	​	$	0.6

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