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

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

 

 

 

 

 

 

 

 

 

 

 

At December 31,

 

 

    

2018

    

2017

 

Trading securities

 

$

213.1

 

$

49.5

 

Weighted average interest rate

 

 

2.2

%  

 

1.8

%

 

 

 

 

 

 

 

 

Available-for-sale

 

$

0.7

 

$

1.0

 

Weighted average interest rate

 

 

0.7

%  

 

0.70

%

Total

 

$

213.8

 

$

50.5

 

 

Summary of activity investments

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

 

 

 

 

 

 

 

 

 

 

 

Years ended

 

 

 

December 31,

 

 

    

2018

    

2017

 

Trading:

 

 

 

 

 

 

 

Interest earned

 

$

0.5

 

$

0.7

 

Unrealized gain (loss) at December 31,

 

$

(0.2)

 

$

0.1

 

 

 

 

 

 

 

 

 

Available-for-sale:

 

 

 

 

 

 

 

Interest earned

 

 

 

(*)  

 

 

(*)

Investment redeemed

 

$

0.3

 

$

1.1

 

(*)   Less than $0.1 million

Schedule of contractual maturities of the Company's available-for-sale debt securities

At December 31, 2018 and 2017, contractual maturities of the available-for-sale debt securities are as follows (in millions):

 

 

 

 

 

 

 

 

 

    

2018

    

2017

One year or less

 

$

 —

 

$

 —

Maturing after one year through five years

 

 

 —

 

 

 —

Maturing after five years through ten years

 

 

 —

 

 

 —

Due after 10 years

 

 

0.7

 

 

1.0

Total debt securities

 

$

0.7

 

$

1.0