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SHORT-TERM INVESTMENTS: (Tables)
 9 Months Ended
Sep. 30, 2015
SHORT-TERM INVESTMENTS:  
Schedule of short-term investments

 

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

 

 

 

At September 30,
2015

 

At December 31,
2014

 

Trading securities

 

$
878.0 

 

$
333.7 

 

Weighted average interest rate

 
1.04 

%
0.78 

%

 

 

 

 

 

 

Available-for-sale

 

$
4.1 

 

$
4.9 

 

Weighted average interest rate

 
0.53 

%
0.44 

%

 

 

 

 

 

 

Total

 

$
882.1 

 

$
338.6 

 

 

 

 

 

 

 

 

 

 

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,

 

 

 

2015

 

2014

 

2015

 

2014

 

Trading securities:

 

 

 

 

 

 

 

 

 

Interest earned

 

$
0.4 

 

$
1.1 

 

$
0.9 

 

$
3.6 

 

Unrealized gain (loss) at the end of the period

 

(*

)
1.0 

 

(*

)
1.0 

 

 

 

 

 

 

 

 

 

 

 

Available-for-sale:

 

 

 

 

 

 

 

 

 

Interest earned

 

(*

)

(*

)

(*

)

(*

)

Investment redeemed

 

$
0.2 

 

$
0.3 

 

$
0.8 

 

$
0.5 

 

 

(*) Less than $0.1 million