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SHORT-TERM INVESTMENTS: (Tables)
 12 Months Ended
Dec. 31, 2014
SHORT-TERM INVESTMENTS:  
Schedule of short-term investments

 

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

 

 

 

At December 31,

 

 

 

2014

 

2013

 

Trading securities

 

$
333.7 

 

$
202.6 

 

Weighted average interest rate

 
0.78 

%
3.78 

%

 

 

 

 

 

 

Available-for-sale

 

$
4.9 

 

$
5.7 

 

Weighted average interest rate

 
0.44 

%
0.42 

%

Total

 

$
338.6 

 

$
208.3 

 

 

Summary of activities in short-term investments

 

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

 

 

 

Years ended December 31,

 

 

 

2014

 

2013

 

Trading:

 

 

 

 

 

Interest earned

 

$
4.9

 

$
5.2

 

Unrealized gain (loss) at December 31,

 

$
2.1

 

$
(1.9

)

 

 

 

 

 

 

Available-for-sale:

 

 

 

 

 

Interest earned

 

(*)

 

(*)

 

Investment redeemed

 

$
0.8

 

$
0.8

 

 

 

(*) Less than $0.1 million

 

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

 

At December 31, 2014 and 2013, contractual maturities of the available-for-sale debt securities are as follows (in millions):

 

 

 

2014

 

2013

 

One year or less

 

$
0.3 

 

$
0.4 

 

Maturing after one year through five years

 

—

 

—

 

Maturing after five years through ten years

 
0.1 

 
0.2 

 

Due after 10 years

 
4.5 

 
5.1 

 

Total debt securities

 

$
4.9 

 

$
5.7