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

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

 

 

 

At September 30,
2013

 

At December 31,
2012

 

 

 

 

 

 

 

Trading securities

 

$

357.4

 

$

127.8

 

Weighted average interest rate

 

2.18

%

1.87

%

 

 

 

 

 

 

Available-for-sale

 

$

6.1

 

$

6.5

 

Weighted average interest rate

 

0.42

%

0.43

%

Total

 

$

363.5

 

$

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

 

Nine months ended

 

 

 

September 30,

 

September 30,

 

 

 

2013

 

2012

 

2013

 

2012

 

Trading securities:

 

 

 

 

 

 

 

 

 

Interest earned

 

$

1.9

 

$

0.9

 

$

3.9

 

$

2.5

 

Unrealized gain (loss)

 

(3.3

)

3.7

 

(2.3

)

8.8

 

 

 

 

 

 

 

 

 

 

 

Available-for-sale:

 

 

 

 

 

 

 

 

 

Interest earned

 

(*

)

(*

)

(*

)

(*

)

Investment redeemed

 

$

—

 

$

0.2

 

$

0.4

 

$

1.4

 

 

(*) Less than $0.1 million