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SHORT-TERM INVESTMENTS: (Tables)
 6 Months Ended
Jun. 30, 2014
SHORT-TERM INVESTMENTS:  
Schedule of short-term investments

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

 

 

 

At June 30,
2014

 

At December 31,
2013

 

Trading securities

 

$

284.4

 

$

202.6

 

Weighted average interest rate

 

1.80

%

3.78

%

 

 

 

 

 

 

Available for sale

 

$

5.5

 

$

5.7

 

Weighted average interest rate

 

0.41

%

0.42

%

Total

 

$

289.9

 

$

208.3

 
Summary of activities in short-term investments

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

 

 

 

Three months ended

 

Six months ended

 

 

 

June 30,

 

June 30,

 

 

 

2014

 

2013

 

2014

 

2013

 

Trading securities:

 

 

 

 

 

 

 

 

 

Interest earned

 

$

1.1

 

$

1.4

 

$

2.5

 

$

2.0

 

Unrealized gain (loss) at the end of the period

 

$

1.7

 

$

3.4

 

$

1.7

 

$

3.4

 

 

 

 

 

 

 

 

 

 

 

Available for sale:

 

 

 

 

 

 

 

 

 

Interest earned

 

(*

)

(*

)

(*

)

(*

)

Investment redeemed

 

$

0.2

 

$

0.4

 

$

0.2

 

$

0.4

 

 

(*) Less than $0.1 million