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SHORT-TERM INVESTMENTS: | 3 Months Ended
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Mar. 31, 2013
SHORT-TERM INVESTMENTS: |
SHORT-TERM INVESTMENTS: | NOTE 2 — SHORT-TERM INVESTMENTS: Short-term investments were as follows ($ in millions):
|  | March 31, |  | December 31, |
|  | 2013 |  | 2012 |
Trading securities |  | $ | 198.0 |  | $ | 127.8 |
Weighted average interest rate |  | 1.43 | % | 1.87 | %
Available for sale |  | $ | 6.5 |  | $ | 6.5 |
Weighted average interest rate |  | 0.44 | % | 0.43 | %
Total |  | $ | 204.5 |  | $ | 134.3 |
Trading securities consist of bonds issued by public companies and are publicly traded. Each financial instrument is independent of the others. The Company has the intention to sell these bonds in the short-term. Available for sale investments consist of securities issued by public companies. Each security is independent of the others and, as of March 31, 2013, included corporate bonds and asset and mortgage backed obligations. As of March 31, 2013 and December 31, 2012, gross unrealized gains and losses on available for sale securities were not material. Related to these investments the Company earned interest, which was recorded as interest income in the condensed consolidated statement of earnings. Also the Company redeemed some of these securities and recognized gains (losses) due to changes in fair value, which were recorded as other income (expense) in the condensed consolidated statement of earnings. The following table summarizes the activity of these investments by category (in millions):
|  | Three months ended March 31, |
|  | 2013 |  | 2012 |
Trading: |  |  |  |  |
Interest earned |  | $ | 0.6 |  | $ | 0.8 |
Unrealized gain (loss) |  | $ | 1.1 |  | $ | 5.0 |
Available for sale: |  |  |  |  |
Interest earned |  | (* | ) | (* | )
Investment redeemed |  | $ | — |  | $ | 0.3 |
(*) Less than $0.1 million.

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