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Retirement Plans and Post Retirement Benefits Defined Contribution Plans and Other Benefit Plans (Details) - USD ($) shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Contribution Plans [Abstract] |  |  |
Expenses related to defined contribution plans and multiemployer plan | $ 10.1 | $ 9.7 | $ 8.7
Funded status | $ (21.9) | (79.6) |
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" | $ (1.1) | (1.9) |
US Defined Contribution Plan [Member] |  |  |
Defined Contribution Plans [Abstract] |  |  |
Maximum percentage of employee's wages eligible for company match | 5.00% |  |
Shares of LP common stock included in plan assets | 1.3 |  |
Total market value of plan assets represented by LP common stock | 7.50% |  |
Canadian Defined Contribution Plan [Member] |  |  |
Defined Contribution Plans [Abstract] |  |  |
Maximum percentage of employee's wages eligible for company match | 3.00% |  |
Percentage of base contribution | 2.50% |  |
Employer matching percentage | 50.00% |  |
Other Postretirement Benefits |  |  |
Defined Contribution Plans [Abstract] |  |  |
Funded status | $ 8.6 | $ 9.0 |

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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 Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. + References Reference 1: 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=82843861&loc=d3e1928-114920 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=64852052&loc=d3e1703-114919 + Details
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