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SHORT-TERM INVESTMENTS: (Tables)
 6 Months Ended
Jun. 30, 2013
SHORT-TERM INVESTMENTS:  
Schedule of short-term investments

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

 

 

 

At June 30,
2013

 

At December 31,
2012

 

Trading securities

 

$

386.8

 

$

127.8

 

Weighted average interest rate

 

2.05

%

1.87

%

 

 

 

 

 

 

Available for sale

 

$

6.1

 

$

6.5

 

Weighted average interest rate

 

0.41

%

0.43

%

Total

 

$

392.9

 

$

134.3

 
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,

 

 

 

2013

 

2012

 

2013

 

2012

 

Trading securities:

 

 

 

 

 

 

 

 

 

Interest earned

 

$

1.4

 

$

0.9

 

$

2.0

 

$

1.6

 

Unrealized gain (loss)

 

(0.1

)

0.1

 

1.0

 

5.1

 

 

 

 

 

 

 

 

 

 

 

Available for sale:

 

 

 

 

 

 

 

 

 

Interest earned

 

(*

)

(*

)

(*

)

(*

)

Investment redeemed

 

$

0.4

 

$

0.9

 

$

0.4

 

$

1.2

 

 

 

(*) Less than $0.1 million