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SHORT-TERM INVESTMENTS: (Tables)

9 Months Ended

Sep. 30, 2025

SHORT-TERM INVESTMENTS:

Schedule of short-term investments

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


		At September 30,			At December 31,
		2025			2024
Trading securities		$	575.8		$	245.2
Weighted average interest rate			4.4	%		4.7	%

Available-for-sale		$	0.1		$	0.2
Weighted average interest rate			0.9	%		0.9	%
Total		$	575.9		$	245.3

Summary of trading investment activity

The following table summarizes trading investment activity (in millions):


		Three months ended						Nine months ended
		September 30,						September 30,
		2025			2024			2025			2024
Trading:
Interest earned		$	13.6		$	8.0		$	20.0		$	18.6
Unrealized gain (loss) at the end of the period		$	(*)		$	(*)		$	(*)		$	(*)

(*) Less than $0.1 million.