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SHORT-TERM INVESTMENTS: (Tables) | 3 Months Ended
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Mar. 31, 2012
SHORT-TERM INVESTMENTS: |
Schedule of short-term investments |
|  | March 31, |  | December 31, |
|  | 2012 |  | 2011 |
Trading securities |  | $ | 220.0 |  | $ | 514.6 |
Weighted average interest rate |  | 1.33 | % | 1.37 | %
Available for sale |  | 7.3 |  | 7.3 |
Weighted average interest rate |  | 0.52 | % | 0.58 | %
Total |  | $ | 227.3 |  | $ | 521.9 |
Summary of activities in short-term investments |
|  | Three months ended March 31, |
|  | 2012 |  | 2011 |
Trading: |  |  |  |  |
Interest earned |  | $ | 0.8 |  | $ | 0.4 |
Unrealized loss |  | $ | 2.6 |  | — |
Available for sale: |  |  |  |  |
Interest earned |  | (* | ) | (* | )
Investment redeemed |  | $ | 0.3 |  | $ | 0.4 |
(*) Less than $0.1 million.

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- Definition Tabular disclosure of activities in short-term investments during the period which includes the interest income earned during the period and proceeds from redemption of investments. + References No definition available. + Details
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- Definition Tabular disclosure of short-term investments which includes the carrying amount as of the balance sheet date and weighted average interest rate. + References No definition available. + Details
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