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SHORT-TERM INVESTMENTS: (Tables)

6 Months Ended

Jun. 30, 2024

SHORT-TERM INVESTMENTS:

Schedule of short-term investments

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


		At June 30,			At December 31,
		2024			2023
Trading securities		$	328.9		$	599.1
Weighted average interest rate			5.5	%		5.7	%

Available-for-sale		$	0.2		$	0.2
Weighted average interest rate			0.8	%		0.8	%
Total		$	329.1		$	599.3

Summary of activity investments

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


		Three months ended						Six months ended
		June 30,						June 30,
		2024			2023			2024			2023
Trading:
Interest earned		$	7.6		$	3.5		$	13.7		$	6.9
Unrealized gain (loss) at the end of the period		$	(*)		$	(*)		$	(*)		$	(*)

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

(*) Less than $0.1 million.