v3.25.1
SHORT-TERM INVESTMENTS: (Tables)
3 Months Ended
Mar. 31, 2025
SHORT-TERM INVESTMENTS:  
Schedule of short-term investments

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

At March 31, 

At December 31, 

    

2025

    

2024

Trading securities

$

218.0

$

245.2

Weighted average interest rate

 

4.5

%  

 

4.7

%

Available-for-sale

$

0.1

$

0.2

Weighted average interest rate

 

0.8

%  

 

0.9

%

Total

$

218.2

$

245.3

Summary of activity investments

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

Three months ended

 

March 31, 

    

2025

    

2024

 

Trading:

Interest earned

$

9.6

$

7.7

Unrealized gain (loss) at the end of the period

$

(*)

$

(*)

(*) Less than $0.1 million.