SHORT-TERM INVESTMENTS: (Tables)

6 Months Ended

Jun. 30, 2026

SHORT-TERM INVESTMENTS:

Schedule of short-term investments

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


		At June 30,			At December 31,
		2026			2025
Trading securities		$	1,664.8		$	604.5
Weighted average interest rate			3.9	%		4.1	%

Available-for-sale		$	0.1		$	0.1
Weighted average interest rate			0.9	%		0.9	%
Total		$	1,664.9		$	604.6

Summary of trading investment activity

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

Three months ended

Six months ended

June 30,

June 30,

 

2026

 

2025

 

2026

 

2025

Trading:

Interest earned

$

20.4

$

7.2

$

25.7

$

9.5

Unrealized gain (loss) at the end of the period

$

(*)

$

(*)

$

(*)

$

(*)

(*) Less than $0.1 million.