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SHORT-TERM INVESTMENTS: (Tables)
 6 Months Ended
Jun. 30, 2018
SHORT-TERM INVESTMENTS:  
Schedule of short-term investments

 

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

 

 

 

At June 30,

 

At December 31,

 

 

 

2018

 

2017

 

Trading securities

 

$
49.9

 

$
49.5

 

Weighted average interest rate

 
2.3

%
1.8

%

 

 

 

 

 

 

Available-for-sale

 

$
0.8

 

$
1.0

 

Weighted average interest rate

 
0.7

%
0.7

%

 

 

 

 

 

 

Total

 

$
50.7

 

$
50.5

 

 

 

 

 

 

 

 

 

 

Summary of activity investments

 

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

 

 

 

Three months ended

 

Six months ended

 

 

 

June 30,

 

June 30,

 

 

 

2018

 

2017

 

2018

 

2017

 

Trading securities:

 

 

 

 

 

 

 

 

 

Interest earned

 

$
0.1

 

$
0.2

 

$
0.1

 

$
0.4

 

Unrealized gain (loss) at the end of the period

 

$
(0.1

)

$

(*

)

$
(0.2

)

$
(0.1

)

 

 

 

 

 

 

 

 

 

 

Available-for-sale:

 

 

 

 

 

 

 

 

 

Interest earned

 

(*

)

(*

)

(*

)

(*

)

Investment redeemed

 

$
0.1

 

$
1.0

 

$
0.2

 

$
1.0

 

 

 

(*) Less than $0.1 million.