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SHORT-TERM INVESTMENTS: (Tables)
 3 Months Ended
Mar. 31, 2018
SHORT-TERM INVESTMENTS:  
Schedule of short-term investments

 

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

 

 

 

At March 31,

 

At December 31,

 

 

 

2018

 

2017

 

Trading securities

 

$
55.6

 

$
49.5

 

Weighted average interest rate

 
1.9

%
1.8

%

 

 

 

 

 

 

Available-for-sale

 

$
0.9

 

$
1.0

 

Weighted average interest rate

 
0.7

%
0.7

%

 

 

 

 

 

 

Total

 

$
56.5

 

$
50.5

 

 

 

 

 

 

 

 

 

 

Summary of activities of short-term investments

 

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

 

 

 

Three months ended
March 31,

 

 

 

2018

 

2017

 

Trading:

 

 

 

 

 

Interest earned

 

$
0.1

 

$
0.2

 

Unrealized (loss) gain at the end of the period

 

$
(0.1

)

$
(0.1

)

 

 

 

 

 

 

Available-for-sale:

 

 

 

 

 

Interest earned

 

(*

)

(*

)

Investment redeemed

 

$
0.1

 

$

(*

)

 

(*) Less than $0.1 million.