SHORT-TERM INVESTMENTS: (Tables)

6 Months Ended

Jun. 30, 2025

SHORT-TERM INVESTMENTS:

Schedule of short-term investments

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

	At June 30,			At December 31,
	2025			2024
Trading securities	$	675.3		$	245.2
Weighted average interest rate		4.6	%		4.7	%
Available-for-sale	$	0.1		$	0.2
Weighted average interest rate		0.8	%		0.9	%
Total	$	675.4		$	245.3

Summary of trading investment activity

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

	Three months ended				Six months ended
	June 30,				June 30,
	2025		2024		2025		2024
Trading:
Interest earned	$	7.2	$	7.6	$	9.5	$	13.7
Unrealized gain (loss) at the end of the period	$	(*)	$	(*)	$	(*)	$	(*)

(*) Less than $0.1 million.