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SHORT-TERM INVESTMENTS: (Tables)

9 Months Ended

Sep. 30, 2022

SHORT-TERM INVESTMENTS:

Schedule of short-term investments

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


		At September 30,			At December 31,
		2022			2021
Trading securities		$	—		$	486.5
Weighted average interest rate			—	%		0.3	%

Available-for-sale		$	0.3		$	0.4
Weighted average interest rate			0.8	%		0.7	%
Total		$	0.3		$	486.9

Summary of activity investments

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


		Three months ended						Nine months ended
		September 30,						September 30,
		2022			2021			2022			2021
Trading:
Interest earned		$	3.3		$	0.6		$	3.9		$	1.3
Unrealized gain (loss) at the end of the period		$	(*)		$	(*)		$	(*)		$	(*)

Available-for-sale:
Interest earned			(*)			(*)			(*)			(*)
Investment redeemed		$	—		$	0.1		$	0.1		$	0.2

(*) Less than $0.1 million.