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Investments | 12 Months Ended
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Dec. 31, 2011
Investments [Abstract] |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] | INVESTMENTS Short-term and long-term investments held by LP are debt securities designated as available for sale and are reported at fair market value using the specific identification method. The following table summarizes unrealized gains and losses related to these investments as of December 31, 2011 and December 31, 2010:
Dollar amounts in millions | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
December 31, 2011 |  |  |  |  |  |  |
Auction rate securities | $ | 0.3 |  |  | $ | 0.4 |  |  | $ | — |  |  | $ | 0.7 |
Total marketable securities | $ | 0.3 |  |  | $ | 0.4 |  |  | $ | — |  |  | $ | 0.7 |
December 31, 2010 |  |  |  |  |  |  |
Auction rate securities | $ | 4.8 |  |  | $ | 10.6 |  |  | $ | — |  |  | $ | 15.4 |
Total marketable securities | $ | 4.8 |  |  | $ | 10.6 |  |  | $ | — |  |  | $ | 15.4 |
As of December 31, 2011, LP had $0.7 million ($23.4 million, par value) invested in auction rate securities (ARS). The ARS held by LP are securities with long-term nominal maturities for which the interest rates are reset through a Dutch auction each month. LP’s investments in ARS represent interests in collateralized debt obligations supported by pools of residential and commercial mortgages, bank trust preferred notes and other securities. During 2011, LP sold $38.1 million (par value) of its ARS in an open market transaction for $19.1 million . LP recorded a gain on sale of securities of $15.2 million, which represents a recovery of losses previously recorded as an "Other-than-temporary impairment". During 2010, LP sold $35.3 million (par value) of its ARS in an open market transaction for $21.8 million. LP recorded a gain on sale of securities of $19.0 million, which represents a recovery of losses previously recorded as an “Other-than-temporary impairment”. During 2009, LP sold $55.0 million (par value) of its ARS pursuant to a tender offer for $21.5 million plus accrued interest. LP recorded a gain on sale of securities of $18.7 million, which represented a recovery of losses previously recorded as an "Other-than-temporary impairment". LP reviews its marketable securities routinely for other-than-temporary impairment. The primary factors LP used to determine if an impairment charge must be recorded, because a decline in value of the security is other than temporary, include (i) whether the fair value of the investment is significantly below its cost basis, (ii) the financial condition of the issuer of the security (including its credit rating) and the underlying collateral, (iii) the length of time that the cost of the security has exceeded its fair value and (iv) LP’s intent and ability to retain the investment for a period of time sufficient to allow for any anticipated recovery in market value. The contractual maturities of debt securities classified as available for sale at December 31, 2011 were as follows:
Dollar amounts in millions | 2011
Amortized Cost |  | Fair Value
Due in one year or less | $ | — |  |  | $ | — |
Due in more than one year | 0.3 |  |  | 0.7 |
Total marketable securities | $ | 0.3 |  |  | $ | 0.7 |
Proceeds from sales and maturities of investments for the years ended December 31, 2011, 2010 and 2009, totaled $19.1 million, $21.8 million, and $50.3 million. There were no purchases of short-term and long-term investments for the years ended December 31, 2011, 2010, and 2009. The gross realized gains and losses related to the sales of short-term investments, other than the sale of ARS described above, were not material for the year ended December 31, 2009. During 2011 and 2010, LP did not own any short-term investments. Net unrealized gains and losses on derivative instruments are reported as a separate component of “Accumulated comprehensive loss” in Stockholders’ equity.

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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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