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Retirement Plans and Post Retirement Benefits Defined Contribution Plans and Other Benefit Plans (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2011 U.S. 401(k) Plans [Member] | Dec. 31, 2008 U.S. 401(k) Plans [Member] | Dec. 31, 2011 Canada Defined Contribution Plans [Member] | Dec. 31, 2011 Other Postretirement Benefits [Member] | Dec. 31, 2010 Other Postretirement Benefits [Member]
Defined Contribution Plans [Abstract] |  |  |  |  |  |  |  |
Maximum percentage of employee's wages eligible for company match |  |  |  | 2.00% | 3.50% | 3.00% |  |
Shares of LP common stock included in plan assets |  |  |  | 3.6 |  |  |  |
Total market value of plan assets represented by LP common stock |  |  |  | 13.20% |  |  |  |
Percentage of base contribution |  |  |  |  |  | 2.50% |  |
Employer matching percentage |  |  |  |  |  | 50.00% |  |
Expenses related to defined contribution plans and multiemployer plan | $ 5.5 | $ 4.2 | $ 2.2 |  |  |  |  |
Funded status | (92.2) | (61.0) |  |  |  |  | 8.5 | 8.5
Deferred Compensation Arrangements [Abstract] |  |  |  |  |  |  |  |
Deferred compensation plan maximum deferral percentage | 90.00% |  |  |  |  |  |  |
Deferred compensation plan, employer contributions and related earnings, maximum vesting period | 5 years |  |  |  |  |  |  |
Deferred compensation liability included in "Other long-term liabilities" | $ 2.1 | $ 2.1 |  |  |  |  |  |

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- Definition Defined Benefit Plan, Percentage of Employer and Related Party Securities Included in Plan Assets + References No definition available. + Details
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- Definition Defined Contribution Plan, Base Annual Contribution Per Employee, Percent + References No definition available. + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Maximum percentage of employee gross pay, by the terms of the plan, that the employer may contribute to a defined contribution plan. + References No definition available. + Details
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- Definition The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph c -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6410544&loc=d3e1703-114919 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition The number of employer shares or related party shares included in plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph n -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (n) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition Amount of contributions made to multiemployer plans for each period for which a statement of income is presented. An employer may disclose total contributions to multiemployer plans without disaggregating the amounts attributable to pension plans and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 12 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 80 -Topic 715 -URI http://asc.fasb.org/extlink&oid=6958064&loc=d3e29142-114947 + Details
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