XML 73 R36.htm IDEA: XBRL DOCUMENT v2.4.0.6
SHORT TERM INVESTMENTS: (Tables)
 12 Months Ended
Dec. 31, 2011
SHORT-TERM INVESTMENTS:  
Schedule of short-term investments

 

 

 

 

At December 31,

 

 

 

2011

 

2010

 

Trading securities

 

$

514.6

 

$

66.9

 

Weighted average interest rate

 

1.37

%

1.14

%

 

 

 

 

 

 

Available-for-sale

 

7.3

 

9.3

 

Weighted average interest rate

 

0.58

%

1.01

%

Total

 

$

521.9

 

$

76.2

 
Summary of activities in short-term investments

 

 

 

 

Years ended December 31,

 

 

 

2011

 

2010

 

Trading:

 

 

 

 

 

Interest earned

 

$

6.0

 

$

2.6

 

Unrealized loss

 

$

7.9

 

—

 

 

 

 

 

 

 

Available-for-sale:

 

 

 

 

 

Interest earned

 

$

0.1

 

$

0.2

 

Investment redeemed

 

$

2.1

 

$

14.8

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

 

 

 

 

2011

 

2010

 

One year or less

 

$

0.5

 

$

0.4

 

Maturing after one year through five years

 

—

 

0.2

 

Maturing after five years through ten years

 

0.6

 

—

 

Due after 10 years

 

6.2

 

8.7

 

Total debt securities

 

$

7.3

 

$

9.3