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SHORT TERM INVESTMENTS: (Tables) | 12 Months Ended
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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 |

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