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SHORT-TERM INVESTMENTS: | 12 Months Ended
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Dec. 31, 2011
SHORT-TERM INVESTMENTS: |
SHORT-TERM INVESTMENTS: |
NOTE 4- SHORT-TERM INVESTMENTS: Short-term investments were as follows ($ in millions):
|  | 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 |
Trading securities: consist of bonds issued by public companies. 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 December 31, 2011, included corporate bonds and asset and mortgage backed obligations. As of December 31, 2011 and 2010, 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 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 consolidated statement of earnings. The following table summarizes the activity of these investments by category (in millions):
|  | 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 |
At December 31, 2011 and 2010, contractual maturities of the available-for-sale debt securities are as follows (in millions):
|  | 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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- Definition Tabular disclosure of investments in certain debt and equity securities (and certain other trading assets) which include all debt and equity securities (other than those equity securities accounted for under the equity or cost methods of accounting) with readily determinable fair values. Other trading assets include assets that are carried on the balance sheet at fair value and held for trading purposes. A debt security represents a creditor relationship with an enterprise that is in the form of a security. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities (and other trading assets). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27405-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Equity Security -URI http://asc.fasb.org/extlink&oid=6511694 -Topic 320 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Debt Security -URI http://asc.fasb.org/extlink&oid=6509901 -Topic 320 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 3, 19, 20, 21, 22, 137 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27232-111563 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 + Details
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